# Copyright 2023-2024 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============================================================================
"""Defines nn operators with functional form."""
from __future__ import absolute_import
from math import pi, log, floor
from mindspore import context
from mindspore import log as logger
import mindspore.ops as ops
from mindspore.ops.primitive import constexpr, _primexpr
from mindspore.ops import operations as P
from mindspore.ops import functional as F
from mindspore.ops.operations import nn_ops as NN_OPS
from mindspore.ops.operations import _sequence_ops as seq
import mindspore.common.dtype as mstype
from mindspore.ops.function.math_func import logsumexp
from mindspore.ops.function.random_func import _get_seed, _set_prim_op_user_data
from mindspore.common.tensor import Tensor
from mindspore.common.parameter import Parameter
from mindspore._c_expression import Tensor as Tensor_
from mindspore.ops._primitive_cache import _get_cache_prim
from mindspore import _checkparam as validator
from mindspore.ops.composite.multitype_ops._constexpr_utils import raise_value_error
from mindspore.ops.operations.nn_ops import MaxUnpool2D, MaxUnpool3D
from mindspore.ops.operations.nn_ops import FractionalMaxPoolWithFixedKsize, FractionalMaxPool3DWithFixedKsize
from mindspore.ops.operations.nn_ops import PadV3
from mindspore.ops.operations.nn_ops import ChannelShuffle
from mindspore.ops.operations.nn_ops import TripletMarginLoss
from mindspore.ops.operations._sequence_ops import TupleToTensor, TensorToTuple, ListToTensor
from mindspore.common.api import _function_forbid_reuse
from mindspore.ops.auto_generate import log_softmax, dense, prelu, celu, relu, fast_gelu, silu, elu, sigmoid, relu6
from mindspore.ops.auto_generate import group_norm_op, rms_norm, layer_norm_ext_op, batch_norm_ext_op
from mindspore.ops.auto_generate import (reflection_pad_1d_op, reflection_pad_2d_op, reflection_pad_3d_op,
replication_pad_1d_op, replication_pad_2d_op, replication_pad_3d_op,
constant_pad_nd_op, dropout_ext_op, reverse_v2_impl)
from mindspore.ops.auto_generate.gen_ops_prim import embedding_op, Convolution
from mindspore.common.generator import default_generator
abs_ = P.Abs()
add_ = P.Add()
bias_add_ = P.BiasAdd()
cast_ = P.Cast()
div_ = P.Div()
dtype_ = P.DType()
equal_ = P.Equal()
erf_ = P.Erf()
exp_ = P.Exp()
expand_dims_ = P.ExpandDims()
fillv2_ = P.FillV2()
gather_ = P.Gather()
gather_d_ = P.GatherD()
gelu_ = P.GeLU()
greater_ = P.Greater()
hardswish_ = P.HSwish()
less_ = P.Less()
list_to_tensor_ = ListToTensor()
log_ = P.Log()
matmul_ = P.MatMul()
maximum_ = P.Maximum()
minimum_ = P.Minimum()
mish_ = NN_OPS.Mish()
mul_ = P.Mul()
neg_ = P.Neg()
ones_like_ = P.OnesLike()
reduce_mean_ = P.ReduceMean()
reduce_sum_ = P.ReduceSum()
reshape_ = P.Reshape()
scalar_to_tensor_ = P.ScalarToTensor()
select_ = P.Select()
selu_ = NN_OPS.SeLU()
shape_ = P.Shape()
sigmoid_ = P.Sigmoid()
sign_ = P.Sign()
slice_ = P.Slice()
softplus_ = P.Softplus()
softsign_ = P.Softsign()
sqrt_ = P.Sqrt()
square_ = P.Square()
sub_ = P.Sub()
tensor_shape_ = P.TensorShape()
tensor_to_tuple_ = TensorToTuple()
transpose_ = P.Transpose()
tuple_to_tensor_ = TupleToTensor()
check_positive_int_const = validator.check_positive_int
check_positive_int_sequence_const = validator.check_positive_int_sequence
check_positive_float_const = validator.check_positive_float
check_positive_float_sequence_const = validator.check_positive_float_sequence
check_bool_const = constexpr(validator.check_bool)
check_int_const = validator.check_is_int
check_non_negative_float_const = validator.check_non_negative_float
check_string_const = constexpr(validator.check_string)
generator_step_ = Tensor(1, mstype.int64)
[文档]def adaptive_avg_pool2d(input, output_size):
r"""
Performs 2D adaptive average pooling on a multi-plane input signal.
That is, for any input size, the size of the specified output is H x W.
The number of output features is equal to the number of input features.
The input and output data format can be "NCHW" and "CHW". N is the batch size, C is the number of channels,
H is the feature height, and W is the feature width.
For adaptive average pooling for 2D:
.. math::
\begin{align}
h_{start} &= floor(i * H_{in} / H_{out})\\
h_{end} &= ceil((i + 1) * H_{in} / H_{out})\\
w_{start} &= floor(j * W_{in} / W_{out})\\
w_{end} &= ceil((j + 1) * W_{in} / W_{out})\\
Output(i,j) &= \frac{\sum Input[h_{start}:h_{end}, w_{start}:w_{end}]}{(h_{end}- h_{start})
* (w_{end}- w_{start})}
\end{align}
.. warning::
This is an experimental API that is subject to change or deletion.
Args:
input (Tensor): The input of adaptive_avg_pool2d, which is a 3D or 4D tensor,
with float16, float32 or float64 data type.
output_size (Union[int, tuple]): The target output size. `output_size` can be a tuple :math:`(H, W)`,
or an int H for :math:`(H, H)`. :math:`H` and :math:`W` can be int or None.
If it is None, it means the output size is the same as the input size.
Returns:
Tensor, with the same type as the `input`.
Shape of the output is `input_shape[:len(input_shape) - len(out_shape)] + out_shape`.
.. math::
out\_shape = \begin{cases}
input\_shape[-2] + output\_size[1], & \text{if } output\_size text{ is (None, w);}\\
output\_size[0] + input\_shape[-1], & \text{if } output\_size text{ is (h, None);}\\
input\_shape[-2:], & \text{if } output\_size text{ is (None, None);}\\
(h, h), & \text{if } output\_size text{ is h;}\\
(h, w), & \text{if } output\_size text{ is (h, w)}
\end{cases}
Raises:
ValueError: If `output_size` is a tuple and the length of `output_size` is not 2.
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not float16, float32 or float64.
ValueError: If the dimension of `input` is less than or equal to the dimension of `output_size`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> # case 1: output_size=(None, 2)
>>> input = Tensor(np.array([[[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]],
... [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]],
... [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]]]), mindspore.float32)
>>> output = ops.adaptive_avg_pool2d(input, (None, 2))
>>> print(output)
[[[1.5 2.5]
[4.5 5.5]
[7.5 8.5]]
[[1.5 2.5]
[4.5 5.5]
[7.5 8.5]]
[[1.5 2.5]
[4.5 5.5]
[7.5 8.5]]]
>>> # case 2: output_size=2
>>> output = ops.adaptive_avg_pool2d(input, 2)
>>> print(output)
[[[3. 4.]
[6. 7.]]
[[3. 4.]
[6. 7.]]
[[3. 4.]
[6. 7.]]]
>>> # case 3: output_size=(1, 2)
>>> output = ops.adaptive_avg_pool2d(input, (1, 2))
>>> print(output)
[[[4.5 5.5]]
[[4.5 5.5]]
[[4.5 5.5]]]
"""
adaptive_avgpool2d_ = _get_cache_prim(P.AdaptiveAvgPool2D)(output_size)
return adaptive_avgpool2d_(input)
[文档]def adaptive_avg_pool3d(input, output_size):
r"""
Performs 3D adaptive average pooling on a multi-plane input signal.
That is, for any input size, the size of the specified output is :math:`(D, H, W)`.
The number of output features is equal to the number of input planes.
Suppose the last 3 dimension size of x is :math:`(inD, inH, inW)`, the last 3 dimension size of output is
:math:`(outD, outH, outW)`.
.. math::
\begin{array}{ll} \\
\forall \quad od \in [0,outD-1], oh \in [0,outH-1], ow \in [0,outW-1]\\
output[od,oh,ow] = \\
\qquad mean(x[istartD:iendD+1,istartH:iendH+1,istartW:iendW+1])\\
where,\\
\qquad istartD= \left\lceil \frac{od * inD}{outD} \right\rceil \\
\qquad iendD=\left\lfloor \frac{(od+1)* inD}{outD} \right\rfloor \\
\qquad istartH=\left\lceil \frac{oh * inH}{outH} \right\rceil \\
\qquad iendH=\left\lfloor \frac{(oh+1) * inH}{outH} \right\rfloor \\
\qquad istartW=\left\lceil \frac{ow * inW}{outW} \right\rceil \\
\qquad iendW=\left\lfloor \frac{(ow+1) * inW}{outW} \right\rfloor
\end{array}
Args:
input (Tensor): The input of adaptive_avg_pool3d, which is a 5D or 4D Tensor.
output_size (Union[int, tuple]): The target output size. `output_size` can be a tuple :math:`(D, H, W)`,
or an int D for :math:`(D, D, D)`. :math:`D`, :math:`H` and :math:`W` can be int or None
which means the output size is the same as that of the input.
Returns:
Tensor, with the same type as the `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not float16, float32 or float64.
ValueError: If the dimension of `input` is not 4D or 5D.
ValueError: If `output_size` value is not positive.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> # case 1: output_size=(3, 3, 4)
>>> output_size=(3, 3, 4)
>>> input_val = np.random.randn(4, 3, 5, 6, 7)
>>> input = Tensor(input_val, mindspore.float32)
>>> output = ops.adaptive_avg_pool3d(input, output_size)
>>> print(output.shape)
(4, 3, 3, 3, 4)
>>> # case 2: output_size=4
>>> output_size=5
>>> input_val = np.random.randn(2, 3, 8, 6, 12)
>>> input = Tensor(input_val, mindspore.float32)
>>> output = ops.adaptive_avg_pool3d(input, output_size)
>>> print(output.shape)
(2, 3, 5, 5, 5)
>>> # case 3: output_size=(None, 4, 5)
>>> output_size=(None, 4, 5)
>>> input_val = np.random.randn(4, 1, 9, 10, 8)
>>> input = Tensor(input_val, mindspore.float32)
>>> output = ops.adaptive_avg_pool3d(input, output_size)
>>> print(output.shape)
(4, 1, 9, 4, 5)
"""
adaptive_avg_pool3d_ = _get_cache_prim(NN_OPS.AdaptiveAvgPool3D)(output_size)
return adaptive_avg_pool3d_(input)
@constexpr
def _check_avgpool_1d_type_and_int(kernel_size, stride, ceil_mode, count_include_pad):
"""Checks the type of avgpool1d input"""
validator.check_value_type('kernel_size', kernel_size, [int], 'avg_pool1d')
validator.check_value_type('stride', stride, (int, tuple), 'avg_pool1d')
validator.check_value_type('ceil_mode', ceil_mode, bool, 'avg_pool1d')
validator.check_value_type('count_include_pad', count_include_pad, bool, 'avg_pool1d')
validator.check_int(kernel_size, 1, validator.GE, "kernel_size", 'avg_pool1d')
validator.check_int(stride, 1, validator.GE, "stride", 'avg_pool1d')
@constexpr
def check_non_negative_int(arg_value, arg_name=None, prim_name=None):
"""Check argument is non-negative integer, which mean arg_value >= 0."""
validator.check_non_negative_int(arg_value, arg_name, prim_name)
[文档]def avg_pool1d(input_x, kernel_size=1, stride=1, padding=0, ceil_mode=False, count_include_pad=True):
r"""
Applies a 1D average pooling over an input Tensor which can be regarded as a composition of 1D input planes.
Typically the input is of shape :math:`(N_{in}, C_{in}, L_{in})`, avg_pool1d outputs regional average in the
:math:`(L_{in})`-dimension. Given kernel size :math:`ks = l_{ker}` and `stride` :math:`s = s_0`, the
operation is as follows.
.. math::
\text{output}(N_i, C_j, l) = \frac{1}{l_{ker}} \sum_{n=0}^{l_{ker}-1}
\text{input}(N_i, C_j, s_0 \times l + n)
.. warning::
`kernel_size` is in the range `[1, 255]`. `stride` is in the range `[1, 63]`.
Args:
input_x (Tensor): Tensor of shape :math:`(N, C_{in}, L_{in})`.
kernel_size (int): The size of kernel window used to take the average value. Default: ``1`` .
stride (Union(int, tuple[int])): The distance of kernel moving. `stride` can either be an int
number or a tuple of one int number. Default: ``1`` .
padding (Union(int, tuple[int])): The pad value to be filled. `padding` can either be an integer
or a tuple of one integer. Default: ``0`` .
ceil_mode (bool): If True, apply ceil instead of floor to compute the output shape. Default: ``False``.
count_include_pad (bool): If True, include the zero-padding in the averaging calculation. Default: ``True`` .
Returns:
Tensor of shape :math:`(N, C_{out}, L_{out})`.
Raises:
TypeError: If `input_x` is not a Tensor.
TypeError: If `kernel_size` or `stride` is not an int.
TypeError: If `ceil_mode` or `count_include_pad` is not a bool.
ValueError: If length of shape of `input_x` is not equal to `3`.
ValueError: If `kernel_size` or `stride` is less than `1`.
ValueError: If `padding` is not int nor a tuple whose length is equal to `2`.
ValueError: If value(s) of `padding` is less than `0`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.random.randint(0, 10, [1, 3, 6]), mindspore.float32)
>>> output = ops.avg_pool1d(input_x, kernel_size=6, stride=1)
>>> print(output.shape)
(1, 3, 1)
"""
if not isinstance(input_x, (Tensor, Tensor_)):
raise TypeError("For avg_pool1d, the input input_x must be tensor")
_check_avgpool_1d_type_and_int(kernel_size, stride, ceil_mode, count_include_pad)
if isinstance(padding, int):
check_non_negative_int(padding, 'padding', 'avg_pool1d')
padding = (0, 0, 0, 0, padding, padding)
elif isinstance(padding, tuple):
if len(padding) != 1:
raise ValueError("For avg_pool1d, padding should be int or tuple of length 1.")
for item in padding:
check_non_negative_int(item, 'padding', 'avg_pool1d')
padding = (0, 0, 0, 0, padding[0], padding[0])
else:
raise TypeError("For avg_pool1d, padding should be int or tuple of length 1.")
if isinstance(stride, tuple):
if len(stride) != 1:
raise ValueError("For avg_pool1d, stride should be int or tuple of length 1.")
stride = stride[0]
squeeze_op = _get_cache_prim(P.Squeeze)((2, 3))
avg_pool_op = _get_cache_prim(P.AvgPool3D)(kernel_size=(1, 1, kernel_size),
strides=(1, 1, stride),
pad_mode='pad',
pad=padding,
ceil_mode=ceil_mode,
count_include_pad=count_include_pad)
input_x = expand_dims_(input_x, 2)
input_x = expand_dims_(input_x, 2)
input_x = avg_pool_op(input_x)
input_x = squeeze_op(input_x)
return input_x
@_primexpr
def _check_avgpool_2d_kernel_size(kernel_size):
"""check and calculate the avgpool2d kernel_size"""
if isinstance(kernel_size, int):
validator.check_int(kernel_size, 1, validator.GE, "kernel_size", 'avg_pool2d')
kernel_size = (1, kernel_size, kernel_size)
elif isinstance(kernel_size, tuple):
if len(kernel_size) != 2:
raise ValueError("For avg_pool2d, kernel_size should be int or tuple of length 2.")
for item in kernel_size:
validator.check_int(item, 1, validator.GE, "kernel_size", 'avg_pool2d')
kernel_size = (1, kernel_size[0], kernel_size[1])
else:
raise TypeError("For avg_pool2d, kernel_size should be int or tuple of length 2.")
return kernel_size
@_primexpr
def _check_avgpool_2d_stride(stride):
"""check and calculate the avgpool2d stride"""
if isinstance(stride, int):
validator.check_int(stride, 1, validator.GE, "stride", 'avg_pool2d')
stride = (1, stride, stride)
elif isinstance(stride, tuple):
if len(stride) != 2:
raise ValueError("For avg_pool2d, stride should be int or tuple of length 2.")
for item in stride:
validator.check_int(item, 1, validator.GE, "stride", 'avg_pool2d')
stride = (1, stride[0], stride[1])
else:
raise TypeError("For avg_pool2d, stride should be int or tuple of length 2.")
return stride
@_primexpr
def _check_avgpool_2d_padding(padding):
"""check and calculate the avgpool2d padding"""
if isinstance(padding, int):
validator.check_non_negative_int(padding, 'padding', 'avg_pool2d')
padding = (0, 0, padding, padding, padding, padding)
elif isinstance(padding, tuple):
if len(padding) != 4:
raise ValueError("For avg_pool2d, padding should be int or tuple of length 4.")
for item in padding:
validator.check_non_negative_int(item, 'padding', 'avg_pool2d')
padding = (0, 0, padding[0], padding[1], padding[2], padding[3])
else:
raise TypeError("For avg_pool2d, padding should be int or tuple of length 4.")
return padding
@_primexpr
def _check_avg_pool2d_type_and_value(ceil_mode, count_include_pad, divisor_override):
"""check the type of avgpool2d input"""
validator.check_value_type('ceil_mode', ceil_mode, bool, 'avg_pool2d')
validator.check_value_type('count_include_pad', count_include_pad, bool, 'avg_pool2d')
validator.check_non_negative_int(divisor_override, 'divisor_override', 'avg_pool2d')
[文档]def avg_pool2d(input_x, kernel_size=1, stride=1, padding=0, ceil_mode=False, count_include_pad=True,
divisor_override=0):
r"""
Applies a 2D average pooling over an input Tensor which can be regarded as a composition of 2D input planes.
Typically the input is of shape :math:`(N_{in}, C_{in}, H_{in}, W_{in})`, outputs regional average in the
:math:`(H_{in}, W_{in})`-dimension. Given kernel size :math:`(k_{h}, k_{w})` and `strides` , the operation
is as follows.
.. math::
\text{output}(N_i, C_j, h, w) = \frac{1}{k_{h} * k_{w}} \sum_{m=0}^{k_{h}-1} \sum_{n=0}^{k_{w}-1}
\text{input}(N_i, C_j, stride[0] \times h + m, stride[1] \times w + n)
.. warning::
`kernel_size` is in the range `[1, 255]`. `stride` is in the range `[1, 63]`.
Args:
input_x (Tensor): Tensor of shape :math:`(N, C_{in}, H_{in}, W_{in})`.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the average value. It is an int number
that represents height and width of the kernel, or a tuple of two int numbers that represent height and
width respectively. Default: ``1`` .
stride (Union[int, tuple[int]]): The distance of kernel moving, an int number that represents the height and
width of movement are both strides, or a tuple of two int numbers that represent height and width of
movement respectively. Default: ``1`` .
padding (Union(int, tuple[int])): The pad value to be filled. Default: 0. If `padding` is an integer, the
paddings of top, bottom, left and right are the same, equal to pad. If `padding` is a tuple of `4` integers,
the padding of top, bottom, left and right equal to `padding[0]`, `padding[1]`, `padding[2]` and
`padding[3]` correspondingly. Default: ``0`` .
ceil_mode (bool): If True, apply ceil instead of floor to compute the output shape. Default: ``False``.
count_include_pad (bool): If True, include the zero-padding in the averaging calculation. Default: ``True`` .
divisor_override (int): If specified, it will be used as divisor in the averaging calculation, otherwise
`kernel_size` will be used. Default: ``0``, which means not specified.
Returns:
Tensor, with shape :math:`(N, C_{out}, H_{out}, W_{out})`.
Raises:
TypeError: If `input_x` is not a Tensor.
TypeError: If `kernel_size` or `stride` is neither int nor tuple.
TypeError: If `ceil_mode` or `count_include_pad` is not a bool.
TypeError: If `divisor_override` is not an int.
ValueError: If length of shape of `input_x` is not equal to `4`.
ValueError: If `kernel_size` or `stride` is less than 1.
ValueError: If `kernel_size` or `stride` is a tuple whose length is not equal to `2`.
ValueError: If `padding` is not int nor a tuple whose length is equal to `4`.
ValueError: If value(s) of `padding` is less than `0`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.arange(1 * 3 * 3 * 4).reshape(1, 3, 3, 4), mindspore.float32)
>>> output = ops.avg_pool2d(x, kernel_size=2, stride=1)
>>> print(output)
[[[[ 2.5 3.5 4.5]
[ 6.5 7.5 8.5]]
[[14.5 15.5 16.5]
[18.5 19.5 20.5]]
[[26.5 27.5 28.5]
[30.5 31.5 32.5]]]]
"""
if not isinstance(input_x, (Tensor, Tensor_)):
raise TypeError("For avg_pool2d, the input input_x must be tensor")
kernel_size = _check_avgpool_2d_kernel_size(kernel_size)
stride = _check_avgpool_2d_stride(stride)
padding = _check_avgpool_2d_padding(padding)
_check_avg_pool2d_type_and_value(ceil_mode, count_include_pad, divisor_override)
squeeze_op = _get_cache_prim(P.Squeeze)(2)
avg_pool_op = _get_cache_prim(P.AvgPool3D)(kernel_size=kernel_size,
strides=stride,
pad_mode='pad',
pad=padding,
ceil_mode=ceil_mode,
count_include_pad=count_include_pad,
divisor_override=divisor_override)
input_x = expand_dims_(input_x, 2)
input_x = avg_pool_op(input_x)
input_x = squeeze_op(input_x)
return input_x
def avg_pool2d_ext(input, kernel_size, stride=None, padding=0, ceil_mode=False, count_include_pad=True,
divisor_override=None):
r"""
Applies a 2D average pooling over an input Tensor which can be regarded as a composition of 2D input planes.
Typically the input is of shape :math:`(N, C, H_{in}, W_{in})`, outputs regional average in the
:math:`(H_{in}, W_{in})`-dimension. Given kernel size :math:`(k_{H}, k_{W})` and `stride` , the operation
is as follows.
.. math::
\text{output}(N_i, C_j, h, w) = \frac{1}{k_{H} * k_{W}} \sum_{m=0}^{k_{H}-1} \sum_{n=0}^{k_{W}-1}
\text{input}(N_i, C_j, stride[0] \times h + m, stride[1] \times w + n)
Args:
input (Tensor): Tensor of shape :math:`(N, C, H_{in}, W_{in})`.
kernel_size (Union[int, tuple[int], list[int]]): The size of kernel used to take the average value.
Can be a single number or a tuple (kH, kW).
stride (Union[int, tuple[int], list[int]]): The distance of kernel moving. Can be a single number or
a tuple (sH, sW). Default value is `kernel_size` .
padding (Union(int, tuple[int], list[int])): Implicit zero padding to be added on both sides.
Can be a single number or a tuple (padH, padW). Default: 0.
ceil_mode (bool): If True, apply ceil instead of floor to compute the output shape.
Default: ``False``.
count_include_pad (bool): If True, include the zero-padding in the averaging calculation.
Default: ``True`` .
divisor_override (int): If specified, it will be used as divisor in the averaging calculation,
otherwise size of pooling region will be used. Default: ``None``.
Returns:
Tensor, with shape :math:`(N, C, H_{out}, W_{out})`.
.. math::
\begin{array}{ll} \\
H_{out} = \frac{H_{in} + 2 \times padding[0] - kernel_size[0]}{stride[0]} + 1 \\
W_{out} = \frac{W_{in} + 2 \times padding[1] - kernel_size[1]}{stride[1]} + 1
\end{array}
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If `kernel_size` or `stride` is neither int nor tuple.
TypeError: If `ceil_mode` or `count_include_pad` is not a bool.
TypeError: If `divisor_override` is not an int or None.
ValueError: If the dimension of `input` is not equal to `4` or `3`.
ValueError: If `kernel_size` or `stride` is less than 1.
ValueError: If `kernel_size` or `stride` is a tuple whose length is not equal to `2` or `1`.
ValueError: If `padding` is neither a int nor a tuple whose length is equal to `2` or `1`.
ValueError: If value of `padding` is less than `0`.
Supported Platforms:
``Ascend``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.arange(1 * 3 * 3 * 4).reshape(1, 3, 3, 4), mindspore.float32)
>>> output = ops.function.nn_func.avg_pool2d_ext(x, kernel_size=2, stride=1)
>>> print(output)
[[[[ 2.5 3.5 4.5]
[ 6.5 7.5 8.5]]
[[14.5 15.5 16.5]
[18.5 19.5 20.5]]
[[26.5 27.5 28.5]
[30.5 31.5 32.5]]]]
"""
if stride is None:
stride = kernel_size
return _get_cache_prim(ops.auto_generate.AvgPool2D)()(input, kernel_size, stride, padding,
ceil_mode, count_include_pad, divisor_override)
def _check_avg_pool3d_padding(padding):
"""Check the padding value in avg_pool3d op."""
if isinstance(padding, int):
validator.check_non_negative_int(padding, 'padding', 'avg_pool3d')
elif isinstance(padding, tuple):
if len(padding) != 6:
raise ValueError("For avg_pool3d, padding should be int or tuple of length 6.")
for item in padding:
validator.check_non_negative_int(item, 'padding', 'avg_pool3d')
else:
raise TypeError("For avg_pool3d, padding should be int or tuple of length 6.")
[文档]def avg_pool3d(input_x, kernel_size=1, stride=1, padding=0, ceil_mode=False, count_include_pad=True,
divisor_override=0):
r"""
Applies a 3D average pooling over an input Tensor which can be regarded as a composition of 3D input planes.
Typically the input is of shape :math:`(N, C, D_{in}, H_{in}, W_{in})`, avg_pool3d outputs regional average in the
:math:`(D_{in}, H_{in}, W_{in})`-dimension. Given kernel size :math:`ks = (d_{ker}, h_{ker}, w_{ker})` and stride
:math:`s = (s_0, s_1, s_2)`, the operation is as follows.
.. math::
\text{output}(N_i, C_j, d, h, w) =
\frac{1}{d_{ker} * h_{ker} * w_{ker}} \sum_{l=0}^{d_{ker}-1} \sum_{m=0}^{h_{ker}-1} \sum_{n=0}^{w_{ker}-1}
\text{input}(N_i, C_j, s_0 \times d + l, s_1 \times h + m, s_2 \times w + n)
.. warning::
`kernel_size` is in the range `[1, 255]`. `stride` is in the range `[1, 63]`.
Args:
input_x (Tensor): Tensor of shape :math:`(N, C, D_{in}, H_{in}, W_{in})`. Currently support float16 and
float32 data type.
kernel_size (Union[int, tuple[int]], optional): The size of kernel used to take the average value, is an int
number that represents depth, height and width are both `kernel_size`, or a tuple of three int numbers that
represent depth, height and width respectively. Default: ``1`` .
stride (Union[int, tuple[int]], optional): The distance of kernel moving, an int number that represents the
depth, height and width of movement are both stride, or a tuple of three int numbers that represent depth,
height and width of movement respectively. Default: ``1`` .
padding (Union(int, tuple[int]), optional): The pad value to be filled. If `padding` is an integer, the addings
of head, tail, top, bottom, left and right are the same, equal to pad. If `padding` is a tuple of six
integers, the padding of head, tail, top, bottom, left and right equal to padding[0], padding[1],
padding[2], padding[3], padding[4] and padding[5] correspondingly. Default: ``0`` .
ceil_mode (bool, optional): If ``True`` , ceil instead of floor to
compute the output shape. Default: ``False`` .
count_include_pad (bool, optional): If ``True`` , averaging calculation
will include the zero-padding. Default: ``True`` .
divisor_override (int, optional): If specified, it will be used as divisor in the averaging calculation,
otherwise `kernel_size` will be used. Default: ``0`` , which means not specified.
Returns:
Tensor, with shape :math:`(N, C, D_{out}, H_{out}, W_{out})`. Has the same data type with `input_x`.
Raises:
TypeError: If `input_x` is not a Tensor.
TypeError: If `kernel_size`, `stride` or `padding` is neither an int not a tuple.
TypeError: If `ceil_mode` or `count_include_pad` is not a bool.
TypeError: If `divisor_override` is not an int.
ValueError: If length of shape of `input_x` is not equal to `5`.
ValueError: If numbers in `kernel_size` or `stride` are not positive.
ValueError: If `kernel_size` or `stride` is a tuple whose length is not equal to `3`.
ValueError: If `padding` is a tuple whose length is not equal to `6`.
ValueError: If element of `padding` is less than `0`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.arange(1 * 2 * 2 * 2 * 3).reshape((1, 2, 2, 2, 3)), mindspore.float16)
>>> output = ops.avg_pool3d(input_x, kernel_size=2, stride=1)
>>> print(output)
[[[[[ 5. 6.]]]
[[[17. 18.]]]]]
"""
if not isinstance(input_x, (Tensor, Tensor_)):
raise TypeError("For avg_pool3d, the input input_x must be tensor")
_check_avg_pool3d_padding(padding)
avg_pool_op = _get_cache_prim(P.AvgPool3D)(kernel_size=kernel_size,
strides=stride,
pad_mode='pad',
pad=padding,
ceil_mode=ceil_mode,
count_include_pad=count_include_pad,
divisor_override=divisor_override)
return avg_pool_op(input_x)
@constexpr
def is_ascend_backend():
"""Check if the Ascend is used"""
return context.get_context('device_target') == 'Ascend'
@_primexpr
def _check_adaptive_max_pool1d_output_size(output_size):
"""Check the output_size value in adaptive_max_pool1d op."""
validator.check_int(output_size, 1, validator.GE, "output_size", 'adaptive_max_pool1d')
validator.check_value_type('output_size', output_size, [int], 'adaptive_max_pool1d')
[文档]def adaptive_max_pool1d(input, output_size):
r"""
Applies a 1D adaptive maximum pooling over an input Tensor which can be regarded as
a composition of 1D input planes.
Typically, the input is of shape :math:`(N, C, L_{in})`,
adaptive_max_pool1d outputs regional maximum in the :math:`L_{in}`-dimension. The output is of
shape :math:`(N, C, L_{out})`, where :math:`L_{out}` is defined by `output_size`.
Note:
- :math:`L_{in}` must be divisible by `output_size`.
- Ascend platform only supports float16 type for input.
Args:
input (Tensor): Tensor of shape :math:`(N, C, L_{in})`, with float16 or float32 data type.
output_size (int): the target output size :math:`L_{out}`.
Returns:
Tensor of shape :math:`(N, C, L_{out})`, has the same type as `input`.
Raises:
TypeError: If `input` is neither float16 nor float32.
TypeError: If `output_size` is not an int.
ValueError: If `output_size` is less than 1.
ValueError: If the last dimension of `input` is smaller than `output_size`.
ValueError: If the last dimension of `input` is not divisible by `output_size`.
ValueError: If length of shape of `input` is not equal to 3.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.random.randint(0, 10, [1, 3, 6]), mindspore.float32)
>>> output = ops.adaptive_max_pool1d(input, output_size=2)
>>> print(output.shape)
(1, 3, 2)
"""
if not isinstance(input, (Tensor, Tensor_)):
raise TypeError("For adaptive_max_pool1d, the input input must be tensor")
_check_adaptive_max_pool1d_output_size(output_size)
x_in_shape = input.shape
x_dtype = dtype_(input)
if len(x_in_shape) != 3:
raise ValueError(f"For adaptive_max_pool1d input must have 3 dim, but got {len(x_in_shape)}.")
if x_in_shape[2] < output_size:
raise ValueError(f"For adaptive_max_pool1d input's last dimension must be greater or equal to "
f"output size {output_size}, but got {x_in_shape[2]}.")
if x_in_shape[2] % output_size != 0:
raise ValueError(f"For adaptive_max_pool1d input's last dimension must be divisible by "
f"output size {output_size}, but got {x_in_shape[2]}.")
if is_ascend_backend():
if x_dtype not in [mstype.float16]:
raise TypeError(f"For adaptive_max_pool1d in Ascend platform, the input dtype must be float16, "
f"but got {x_dtype}.")
else:
if x_dtype not in [mstype.float16, mstype.float32]:
raise TypeError(f"For adaptive_max_pool1d, the input dtype must be float16 or float32, "
f"but got {x_dtype}.")
squeeze_ = _get_cache_prim(P.Squeeze)(2)
width = x_in_shape[2]
stride = width // output_size
kernel_size = width - (output_size - 1) * stride
stride = (1, width // output_size)
kernel_size = (1, kernel_size)
max_pool_ = _get_cache_prim(NN_OPS.MaxPool)(kernel_size=kernel_size, strides=stride)
input = expand_dims_(input, 2)
input = max_pool_(input)
input = squeeze_(input)
return input
@constexpr
def _check_adaptive_max_pool2d(return_indices):
"""check the type of return_indices"""
validator.check_value_type("return_indices", return_indices, bool, "adaptive_max_pool2d")
[文档]def adaptive_max_pool2d(input, output_size, return_indices=False):
r"""
This operator applies a 2D adaptive max pooling to an input signal composed of multiple input planes.
That is, for any input size, the size of the specified output is H x W.
The number of output features is equal to the number of input planes.
The input and output data format can be "NCHW" and "CHW". N is the batch size, C is the number of channels,
H is the feature height, and W is the feature width.
.. math::
\begin{align}
h_{start} &= floor(i * H_{in} / H_{out})\\
h_{end} &= ceil((i + 1) * H_{in} / H_{out})\\
w_{start} &= floor(j * W_{in} / W_{out})\\
w_{end} &= ceil((j + 1) * W_{in} / W_{out})\\
Output(i,j) &= {\max Input[h_{start}:h_{end}, w_{start}:w_{end}]}
\end{align}
Note:
Ascend platform only supports float16 type for input.
Args:
input (Tensor): A 3D or 4D tensor,
with float16, float32 or float64 data type.
output_size (Union[int, tuple]): The target output size. `output_size` can be a tuple :math:`(H, W)`,
or an int H for :math:`(H, H)`. :math:`H` and :math:`W` can be int or None.
If it is None, it means the output size is the same as the input size.
return_indices (bool): If `return_indices` is ``True`` , the indices of max value would be output.
Default: ``False`` .
Returns:
Tensor, with the same shape and dtype as the `input`.
Raises:
TypeError: If `output_size` is not int or tuple.
TypeError: If `input` is not a tensor.
TypeError: If `return_indices` is not a bool.
TypeError: If dtype of `input` is not float16, float32 or float64.
ValueError: If `output_size` is a tuple and the length of `output_size` is not 2.
ValueError: If the data format of `input` is not "NCHW" or "CHW".
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> # case 1: output_size=(None, 2)
>>> input = Tensor(np.array([[[[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]],
... [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]],
... [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]]]]), mindspore.float32)
>>> output = ops.adaptive_max_pool2d(input, (None, 2))
>>> print(output)
[[[[2. 3.]
[5. 6.]
[8. 9.]]
[[2. 3.]
[5. 6.]
[8. 9.]]
[[2. 3.]
[5. 6.]
[8. 9.]]]]
>>> # case 2: output_size=2
>>> output = ops.adaptive_max_pool2d(input, 2)
>>> print(output)
[[[[5. 6.]
[8. 9.]]
[[5. 6.]
[8. 9.]]
[[5. 6.]
[8. 9.]]]]
>>> # case 3: output_size=(1, 2)
>>> output = ops.adaptive_max_pool2d(input, (1, 2))
>>> print(output)
[[[[8. 9.]]
[[8. 9.]]
[[8. 9.]]]]
"""
_check_adaptive_max_pool2d(return_indices)
_adaptive_max_pool2d = _get_cache_prim(NN_OPS.AdaptiveMaxPool2D)(output_size)
out = _adaptive_max_pool2d(input)
output = out if return_indices else out[0]
return output
def adaptive_max_pool3d(input, output_size, return_indices=False):
r"""
Calculates the 3D adaptive max pooling for an input Tensor.
Args:
input (Tensor): Tensor, with shape :math:`(C, D, H, W)` or :math:`(N, C, D, H, W)`.
output_size (Union[int, tuple]): The specified output size, which is an int or Tuple(int) that
represents depth, height and width, or a tuple of three int numbers that represent depth, height and
width respectively. The value must be a positive integer. If it is None, the output size and
input size of the corresponding dimension are the same.
return_indices (bool, optional): If `return_indices` is `True`, the indices of max value would be output,
Otherwise, it will not be output. Default: `False`.
Returns:
- **y** (Tensor) - Tensor, with the same number of dims and data type as the `input`.
- **argmax** (Tensor) - Tensor, the indices of max value, which has the same shape as the
`y` and it's data type is int32. It will output only when `return_indices` is True.
Raises:
TypeError: If `input` is not a Tensor.
ValueError: If the dimensions number of `input` is not 4 or 5.
TypeError: If dtype of `input` is not int or float.
ValueError: If `output_size` is neither an int nor a tuple with shape (3,).
Supported Platforms:
``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.arange(0,36).reshape((1, 3, 3, 4)).astype(np.float32))
>>> output_size = (1, 1, 2)
>>> output = ops.adaptive_max_pool3d(input, output_size, True)
>>> print(output[0].asnumpy())
[[[[33. 35.]]]]
>>> print(output[1].asnumpy())
[[[[33 35]]]]
"""
if isinstance(output_size, int):
output_size = (output_size, output_size, output_size)
adaptive_max_pool3d_ = _get_cache_prim(NN_OPS.AdaptiveMaxPool3D)()
output_size_ = Tensor(output_size, dtype=mstype.int32)
out = adaptive_max_pool3d_(input, output_size_)
output = out if return_indices else out[0]
return output
[文档]def max_unpool1d(x, indices, kernel_size, stride=None, padding=0, output_size=None):
r"""
Computes the inverse of `max_pool1d`.
`max_unpool1d` keeps the maximal value and set all position of non-maximal values to zero.
Typically the input is of shape :math:`(N, C, H_{in})` or :math:`(C, H_{in})`, and the output is of shape
:math:`(N, C, H_{out})` or :math:`(C, H_{out})`. The operation is as follows.
.. math::
\begin{array}{ll} \\
H_{out} = (H_{in} - 1) \times stride[0] - 2 \times padding[0] + kernel\_size[0] \\
\end{array}
Args:
x (Tensor): The input Tensor to invert. Tensor of shape :math:`(N, C, H_{in})` or :math:`(C, H_{in})`.
indices (Tensor): Index of maximum value.
Tensor of shape must be same with input 'x'.
Values of indices must belong to :math:`[0, H_{in} - 1]`.
Data type must be in int32 or int64.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value.
stride (Union[int, tuple[int]]): The distance of kernel moving,
If stride is 0, (0) or ``None`` , then stride equal to kernel_size.
Default: ``None`` , which indicates the moving step is `kernel_size` .
padding (Union[int, tuple[int]]): The pad value to be filled. Default: ``0`` .
output_size (tuple[int], optional): The output shape. Default: ``None`` .
If output_size == (), then the shape of output computed by `kernel_size`, `stride` and `padding`.
If output_size != (), then output_size must be :math:`(N, C, H)` , :math:`(C, H)` or
:math:`(H)` and output_size must belong to
:math:`[(N, C, H_{out} - stride[0]), (N, C, H_{out} + stride[0])]`.
Returns:
Tensor, with shape :math:`(N, C, H_{out})` or :math:`(C, H_{out})`,
with the same data type with `x`.
Raises:
TypeError: If data type of `x` or `indices` is not supported.
TypeError: If `kernel_size`, `stride` or `padding` is neither an int nor a tuple.
ValueError: If numbers in `stride`, `padding` (also support 0 and (0)) or `kernel_size` is not positive.
ValueError: If the shapes of `x` and `indices` are not equal.
ValueError: If `x` whose length is not 2 or 3.
ValueError: If type of `output_size` is not tuple.
ValueError: If `output_size` whose length is not 0, 2 or 3.
ValueError: If `output_size` is not close to output size computed by attr `kernel_size`, `stride`, `padding`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[2, 4, 6, 8]]).astype(np.float32))
>>> indices = Tensor(np.array([[1, 3, 5, 7]]).astype(np.int64))
>>> output = ops.max_unpool1d(x, indices, kernel_size =2, stride=2, padding=0)
>>> print(output.asnumpy())
[[0. 2. 0. 4. 0. 6. 0. 8.]]
"""
if stride is None:
stride = kernel_size
x_shape = shape_(x)
x_dim = len(x_shape)
if output_size is None:
output_size = ()
else:
if not isinstance(output_size, tuple):
raise ValueError(f"For max_unpool1d, output_size must be tuple, but type {type(output_size)}.")
if len(output_size) not in [0, 1, 2, 3]:
raise ValueError(f"For max_unpool1d, length of output_size with tuple must be 0, 1, 2, 3, "
f"but got type {len(output_size)}.")
if not output_size:
output_size = ()
elif x_dim == 2:
output_size = (1,) + x_shape[:1] + output_size[-1:] + (1,)
else:
output_size = x_shape[:2] + output_size[-1:] + (1,)
if isinstance(kernel_size, tuple):
kernel_size = kernel_size + (1,)
elif isinstance(kernel_size, int):
kernel_size = (kernel_size, 1)
if isinstance(stride, tuple):
stride = stride + (1,)
elif isinstance(stride, int):
stride = (stride, 1)
if isinstance(padding, tuple):
padding = padding + (0,)
elif isinstance(padding, int):
padding = (padding, 0)
max_unpool_2d = _get_cache_prim(MaxUnpool2D)(ksize=kernel_size, strides=stride,
pads=padding, output_shape=output_size, data_format="NCHW")
if x_dim == 2:
x = x.expand_dims(axis=0)
indices = indices.expand_dims(axis=0)
x = x.expand_dims(axis=3)
indices = indices.expand_dims(axis=3)
out = max_unpool_2d(x, indices)
out = out.squeeze(-1)
out = out.squeeze(0)
else:
x = x.expand_dims(axis=3)
indices = indices.expand_dims(axis=3)
out = max_unpool_2d(x, indices)
out = out.squeeze(-1)
return out
[文档]def max_unpool2d(x, indices, kernel_size, stride=None, padding=0, output_size=None):
r"""
Computes the inverse of `max_pool2d`.
`max_unpool2d` keeps the maximal value and set all position of non-maximal values to zero. Typically the input
is of shape :math:`(N, C, H_{in}, W_{in})` or :math:`(C, H_{in}, W_{in})`, and the output is of
shape :math:`(N, C, H_{out}, W_{out})` or :math:`(C, H_{out}, W_{out})`. The operation is as follows.
.. math::
\begin{array}{ll} \\
H_{out} = (H{in} - 1) \times stride[0] - 2 \times padding[0] + kernel\_size[0] \\
W_{out} = (W{in} - 1) \times stride[1] - 2 \times padding[1] + kernel\_size[1] \\
\end{array}
Args:
x (Tensor): The input Tensor to invert.
Tensor of shape :math:`(N, C, H_{in}, W_{in})` or :math:`(C, H_{in}, W_{in})`.
indices (Tensor): Max values' index represented by the indices.
Tensor of shape must be same with input 'x'.
Values of indices must belong to :math:`[0, H_{in} \times W_{in} - 1]`.
Data type must be in int32 or int64.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value,
an int number that represents height and width of the kernel, or a tuple
of two int numbers that represent height and width respectively.
stride (Union[int, tuple[int]]): The distance of kernel moving, an int number that represents
the height and width of movement are both stride, or a tuple of two int numbers that
represent height and width of movement respectively.
Default: ``None`` , which indicates the moving step is `kernel_size` .
padding (Union[int, tuple[int]]): The pad value to be filled. Default: ``0`` . If `padding` is an integer,
the paddings of height and width are the same, equal to padding. If `padding` is a tuple of two
integers, the padding of height and width equal to padding[0] and padding[1] correspondingly.
output_size (tuple[int], optional): The target output size. Default: ``None`` .
If output_size == (), then the shape of output computed by `kernel_size`, `stride` and `padding`.
If output_size != (), then output_size must be :math:`(N, C, H, W)` , :math:`(C, H, W)` or :math:`(H, W)`
and output_size must belong to
:math:`[(N, C, H_{out} - stride[0], W_{out} - stride[1]),
(N, C, H_{out} + stride[0], W_{out} + stride[1])]`.
Returns:
Tensor, with shape :math:`(N, C, H_{out}, W_{out})` or :math:`(C, H_{out}, W_{out})`,
with the same data type with `x`.
Raises:
TypeError: If data type of `x` or `indices` is not supported.
TypeError: If `kernel_size`, `stride` or `padding` is neither an int nor a tuple.
ValueError: If numbers in `stride`, `padding` (also support 0 and (0, 0)) or `kernel_size` is not positive.
ValueError: If the shape of `x` and `indices` are not equal.
ValueError: If `kernel_size`, `stride` or `padding` is a tuple whose length is not equal to 2.
ValueError: If `x` whose length is not 3 or 4.
ValueError: If `output_size` whose type is not tuple.
ValueError: If `output_size` whose length is not 0, 3 or 4.
ValueError: If `output_size` is not close to output size computed by attr `kernel_size`, `stride`, `padding`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[[[0, 1], [8, 9]]]]).astype(np.float32))
>>> indices = Tensor(np.array([[[[0, 1], [2, 3]]]]).astype(np.int64))
>>> output = ops.max_unpool2d(x, indices, kernel_size=1, stride=1, padding=0)
>>> print(output.asnumpy())
[[[[0. 1.]
[8. 9.]]]]
"""
if stride is None:
stride = kernel_size
x_shape = shape_(x)
x_dim = len(x_shape)
if output_size is None:
output_size = ()
else:
if not isinstance(output_size, tuple):
raise ValueError(f"For max_unpool2d, output_size must be tuple, but type {type(output_size)}.")
if len(output_size) not in [0, 2, 3, 4]:
raise ValueError(f"For max_unpool2d, length of output_size with tuple must be 0, 2, 3, 4, "
f"but got type {len(output_size)}.")
if not output_size:
output_size = ()
elif x_dim == 3:
output_size = (1,) + x_shape[:1] + output_size[-2:]
else:
output_size = x_shape[:2] + output_size[-2:]
max_unpool_2d = MaxUnpool2D(ksize=kernel_size, strides=stride, pads=padding, output_shape=output_size,
data_format="NCHW")
if x_dim == 3:
x = x.expand_dims(axis=0)
indices = indices.expand_dims(axis=0)
out = max_unpool_2d(x, indices)
out = out.squeeze(0)
else:
out = max_unpool_2d(x, indices)
return out
[文档]def max_unpool3d(x, indices, kernel_size, stride=None, padding=0, output_size=None):
r"""
Computes the inverse of :func:`mindspore.ops.max_pool3d`.
`max_unpool3d` keeps the maximal value and set all position of non-maximal values to zero.
Typically the input is of shape :math:`(N, C, D_{in}, H_{in}, W_{in})` or :math:`(C, D_{in}, H_{in}, W_{in})`,
and the output is of shape :math:`(N, C, D_{out}, H_{out}, W_{out})` or :math:`(C, D_{out}, H_{out}, W_{out})`.
The operation is as follows.
.. math::
\begin{array}{ll} \\
D_{out} = (D{in} - 1) \times stride[0] - 2 \times padding[0] + kernel\_size[0] \\
H_{out} = (H{in} - 1) \times stride[1] - 2 \times padding[1] + kernel\_size[1] \\
W_{out} = (W{in} - 1) \times stride[2] - 2 \times padding[2] + kernel\_size[2] \\
\end{array}
Args:
x (Tensor): The input Tensor to invert.
Tensor of shape :math:`(N, C, D_{in}, H_{in}, W_{in})` or :math:`(C, D_{in}, H_{in}, W_{in})`.
indices (Tensor): Max values' index represented by the indices. Tensor of shape must be same with input 'x'.
Values of indices must belong to :math:`[0, D_{in} \times H_{in} \times W_{in} - 1]`.
Data type must be in int32 or int64.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value,
an int number that represents depth, height and width of the kernel, or a tuple
of three int numbers that represent depth, height and width respectively.
stride (Union[int, tuple[int]]): The distance of kernel moving, an int number that represents
the depth, height and width of movement are both stride, or a tuple of three int numbers that
represent depth, height and width of movement respectively.
Default: ``None`` , which indicates the moving step is `kernel_size` .
padding (Union[int, tuple[int]]): The pad value to be filled. Default: ``0`` . If `padding` is an integer,
the paddings of depth, height and width are the same, equal to padding. If `padding` is a tuple of three
integers, the padding of depth, height and width equal to padding[0], padding[1] and padding[2]
correspondingly.
output_size (tuple[int], optional): The output size. Default: ``None`` . If output_size == (), then the shape of
output computed by `kernel_size`, `stride` and `padding`. If output_size != (), then output_size must be
:math:`(N, C, D, H, W)` or :math:`(C, D, H, W)` or :math:`(D, H, W)` and output_size must belong to
:math:`[(N, C, D_{out} - stride[0], H_{out} - stride[1], W_{out} - stride[2]),
(N, C, D_{out} + stride[0], H_{out} + stride[1], W_{out} + stride[2])]`.
Returns:
Tensor, with shape :math:`(N, C, D_{out}, H_{out}, W_{out})` or :math:`(C, D_{out}, H_{out}, W_{out})`,
with the same data type with `x`.
Raises:
TypeError: If data type of `x` or `indices` is not supported.
TypeError: If `kernel_size`, `stride` or `padding` is neither an int nor a tuple.
ValueError: If numbers in `stride` or `padding` (also support 0 and (0, 0, 0)) or `kernel_size` is not positive.
ValueError: If the shape of `x` and `indices` are not equal.
ValueError: If `kernel_size`, `stride` or `padding` is a tuple whose length is not equal to 3.
ValueError: If `x` whose length is not 4 or 5.
ValueError: If `output_size` whose length is not 0, 4 or 5.
ValueError: If `output_size` whose type is not tuple.
ValueError: If `output_size` is not close to output size computed by attr `kernel_size`, `stride`, `padding`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[[[[0, 1], [8, 9]]]]]).astype(np.float32))
>>> indices= Tensor(np.array([[[[[0, 1], [2, 3]]]]]).astype(np.int64))
>>> output = ops.max_unpool3d(x, indices, kernel_size=2, stride=1, padding=0)
>>> print(output)
[[[[[0. 1. 8.]
[9. 0. 0.]
[0. 0. 0.]]
[[0. 0. 0.]
[0. 0. 0.]
[0. 0. 0.]]]]]
"""
if stride is None:
stride = kernel_size
x_shape = shape_(x)
x_dim = len(x_shape)
if output_size is None:
output_size = ()
elif not isinstance(output_size, tuple):
raise ValueError(f"For max_unpool3d, output_size must be tuple, but type {type(output_size)}.")
elif len(output_size) not in [0, 3, 4, 5]:
raise ValueError(f"For max_unpool3d, length of output_size with tuple must be 0, 3, 4, 5, "
f"but got type {len(output_size)}.")
if not output_size:
output_size = ()
elif x_dim == 5:
output_size = x_shape[:2] + output_size[-3:]
else:
output_size = (1,) + x_shape[:1] + output_size[-3:]
max_unpool_3d = MaxUnpool3D(ksize=kernel_size, strides=stride, pads=padding, output_shape=output_size,
data_format="NCDHW")
if x_dim == 4:
x = x.expand_dims(axis=0)
indices = indices.expand_dims(axis=0)
out = max_unpool_3d(x, indices)
out = out.squeeze(0)
else:
out = max_unpool_3d(x, indices)
return out
[文档]def binary_cross_entropy_with_logits(input, target, weight=None, pos_weight=None, reduction='mean'):
r"""
Adds sigmoid activation function to input `input` as logits, and uses the given logits to compute binary cross
entropy between the `input` and the `target`.
Sets input `input` as :math:`X`, input target as :math:`Y`, input weight as :math:`W`, output as :math:`L`. Then,
.. math::
\begin{array}{ll} \\
p_{ij} = sigmoid(X_{ij}) = \frac{1}{1 + e^{-X_{ij}}} \\
L_{ij} = -[Y_{ij}log(p_{ij}) + (1 - Y_{ij})log(1 - p_{ij})]
\end{array}
:math:`i` indicates the :math:`i^{th}` sample, :math:`j` indicates the category. Then,
.. math::
\ell(x, y) = \begin{cases}
L, & \text{if reduction} = \text{'none';}\\
\operatorname{mean}(L), & \text{if reduction} = \text{'mean';}\\
\operatorname{sum}(L), & \text{if reduction} = \text{'sum'.}
\end{cases}
:math:`\ell` indicates the method of calculating the loss. There are three methods:
the first method is to provide the loss value directly,
the second method is to calculate the average value of all losses,
and the third method is to calculate the sum of all losses.
This operator will multiply the output by the corresponding weight.
The tensor :math:`weight` assigns different weights to each piece of data in the batch,
and the tensor :math:`pos\_weight` adds corresponding weights to the positive examples of each category.
In addition, it can trade off recall and precision by adding weights to positive examples.
In the case of multi-label classification the loss can be described as:
.. math::
\begin{array}{ll} \\
p_{ij,c} = sigmoid(X_{ij,c}) = \frac{1}{1 + e^{-X_{ij,c}}} \\
L_{ij,c} = -[P_{c}Y_{ij,c} * log(p_{ij,c}) + (1 - Y_{ij,c})log(1 - p_{ij,c})]
\end{array}
where c is the class number (c>1 for multi-label binary classification, c=1 for single-label binary classification),
n is the number of the sample in the batch and :math:`P_c` is the weight of the positive answer for the class c.
:math:`P_c>1` increases the recall, :math:`P_c<1` increases the precision.
Args:
input (Tensor): Input `input`. Data type must be float16 or float32.
target (Tensor): Ground truth label, has the same shape as `input`.
Data type must be float16 or float32.
weight (Tensor, optional): A rescaling weight applied to the loss of each batch element. It can be
broadcast to a tensor with shape of `input`. Data type must be float16 or float32.
Default: ``None``, `weight` is a Tensor whose value is ``1``.
pos_weight (Tensor, optional): A weight of positive examples. Must be a vector with length equal to the
number of classes. It can be broadcast to a tensor with shape of `input`.
Data type must be float16 or float32. Default: ``None``, `pos_weight` is a Tensor whose value is ``1``.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the weighted mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Scalar, if `reduction` is ``'none'``, it's a tensor with the same shape and type as input `input`.
Otherwise, the output is a scalar.
Raises:
TypeError: If input `input`, `target`, `weight`, `pos_weight` is not Tensor.
TypeError: If data type of input `input`, `target`, `weight`, `pos_weight` is neither float16 nor float32.
TypeError: If data type of input `reduction` is not string.
ValueError: If `weight` or `pos_weight` can not be broadcast to a tensor with shape of `input`.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'`` or ``'sum'``.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.array([[-0.8, 1.2, 0.7], [-0.1, -0.4, 0.7]]), mindspore.float32)
>>> target = Tensor(np.array([[0.3, 0.8, 1.2], [-0.6, 0.1, 2.2]]), mindspore.float32)
>>> weight = Tensor(np.array([1.0, 1.0, 1.0]), mindspore.float32)
>>> pos_weight = Tensor(np.array([1.0, 1.0, 1.0]), mindspore.float32)
>>> output = ops.binary_cross_entropy_with_logits(input, target, weight, pos_weight)
>>> print(output)
0.3463612
"""
bce_with_logits_loss_op = _get_cache_prim(NN_OPS.BCEWithLogitsLoss)(reduction)
return bce_with_logits_loss_op(input, target, weight, pos_weight)
[文档]@_function_forbid_reuse
def dropout(input, p=0.5, training=True, seed=None):
r"""
During training, randomly zeroes some of the elements of the input tensor
with probability `p` from a Bernoulli distribution. It plays the role of reducing neuron correlation and
avoid overfitting. And the return will be multiplied by :math:`\frac{1}{1-p}` during training.
During the reasoning, this operation returns the same Tensor as the `x`.
Args:
input (Tensor): The input Tensor of shape :math:`(*, N)`, with data type of float16, float32 or float64.
p (float, optional): The dropping rate, between 0 and 1, e.g. p = 0.1,
means dropping out 10% of input units. Default: ``0.5`` .
training (bool): Apply dropout if is True. Default: ``True``.
seed (int, optional): Seed is used as entropy source for Random number engines generating pseudo-random numbers.
Default: ``None`` , which will be treated as ``0`` .
Returns:
- **output** (Tensor) - Zeroed tensor, with the same shape and data type as `input`.
Raises:
TypeError: If `p` is not a float.
TypeError: If dtype of `input` is not float16, float32 or float64.
TypeError: If `input` is not a Tensor.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> input = Tensor(((20, 16), (50, 50)), mindspore.float32)
>>> output = ops.dropout(input, p=0.5)
>>> print(output.shape)
(2, 2)
"""
check_bool_const(training, "training", "dropout")
if training is False:
return input
keep_prob = 1 - p
seed0, seed1 = _get_seed(seed, "dropout")
dropout_op = P.Dropout(keep_prob=keep_prob, Seed0=seed0, Seed1=seed1)
dropout_op = _set_prim_op_user_data(dropout_op, "random_cache", False)
out, _ = dropout_op(input)
return out
[文档]@_function_forbid_reuse
def dropout_ext(input, p=0.5, training=True):
r"""
During training, randomly zeroes some of the elements of the input tensor
with probability `p` from a Bernoulli distribution. It plays the role of reducing neuron correlation and
avoid overfitting. And the return will be multiplied by :math:`\frac{1}{1-p}` during training.
During the reasoning, this operation returns the same Tensor as the `input`.
Args:
input (Tensor): The input Tensor of shape :math:`(*, N)`.
p (float): The dropping rate of input neurons, between 0 and 1, e.g. `p` = 0.1,
means dropping out 10% of input neurons. Default: ``0.5`` .
training (bool): Apply dropout if it is ``True`` , if it is ``False`` , the input is returned directly,
and `p` is invalid. Default: ``True``.
Returns:
- **output** (Tensor) - Zeroed tensor, with the same shape and data type as `input`.
Raises:
TypeError: If `p` is not a float.
TypeError: If `input` is not a Tensor.
Supported Platforms:
``Ascend``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> input = Tensor(((20, 16), (50, 50)), mindspore.float32)
>>> output = ops.function.nn_func.dropout_ext(input, p=0.5)
>>> print(output.shape)
(2, 2)
"""
check_bool_const(training, "training", "dropout_ext")
if training is False:
return input
seed, offset = default_generator._step(generator_step_) # pylint: disable=protected-access
out, _ = dropout_ext_op(input, p, seed, offset)
return out
[文档]def dropout1d(input, p=0.5, training=True):
r"""
During training, randomly zeroes some channels of the input tensor with probability `p`
from a Bernoulli distribution(For a 3-dimensional tensor with a shape of :math:`NCL`,
the channel feature map refers to a 1-dimensional feature map with the shape of :math:`L`).
For example, the :math:`j\_th` channel of the :math:`i\_th` sample in the batched input is a to-be-processed
`1D` tensor input[i,j].
Each channel will be zeroed out independently on every forward call which based on Bernoulli distribution
probability `p`.
The parper `Dropout: A Simple Way to Prevent Neural Networks from Overfitting
<http://www.cs.toronto.edu/~rsalakhu/papers/srivastava14a.pdf>`_ mentioned this technology, And it is proved that
it can effectively reduce over fitting and prevent neuronal coadaptation.
For more details, refer to `Improving neural networks by preventing co-adaptation of feature detectors
<https://arxiv.org/pdf/1207.0580.pdf>`_ .
`dropout1d` can improve the independence between channel feature maps.
Args:
input (Tensor): A tensor with shape :math:`(N, C, L)` or :math:`(C, L)`, where `N` is the batch size, `C` is the
number of channels, `L` is the feature length. The data type must be int8, int16, int32, int64, float16,
float32 or float64.
p (float, optional): The dropping probability of a channel, between 0 and 1, e.g. `p` = 0.8,
which means an 80% chance of clearing. Default: ``0.5`` .
training (bool, optional): Apply dropout if is True. Default: ``True`` .
Returns:
Tensor, output, with the same shape and data type as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If the data type of `p` is not float.
ValueError: If `p` is out of the range `[0.0, 1.0]`.
ValueError: If `input` shape is not `2D` or `3D`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.random.randn(4, 3), mindspore.float32)
>>> output = ops.dropout1d(input_x, 0.5)
>>> print(output.shape)
(4, 3)
"""
if not isinstance(p, float):
raise TypeError(f"For dropout1d, 'p' must be float, but got type {type(p)}.")
if p < 0 or p > 1:
raise ValueError(f"For dropout1d, the 'p' must be a number in range [0, 1], but got {p}.")
if not isinstance(input, Tensor):
raise TypeError(f"For dropout1d, 'input' must be Tensor, but got type {type(input)}.")
check_bool_const(training, "training", "dropout1d")
if training is False:
return input
dropout_2d_op = NN_OPS.Dropout2D(1.0 - p)
if len(input.shape) == 2:
input = input.expand_dims(0)
input = input.expand_dims(-1)
out, _ = dropout_2d_op(input)
out = out.squeeze(-1)
out = out.squeeze(0)
elif len(input.shape) == 3:
input = input.expand_dims(-1)
out, _ = dropout_2d_op(input)
out = out.squeeze(-1)
else:
raise ValueError(f"For dropout1d, input shape should be 2D or 3D, but got {len(input.shape)}.")
return out
[文档]def dropout2d(input, p=0.5, training=True):
r"""
During training, randomly zeroes some channels of the input tensor with probability `p`
from a Bernoulli distribution(For a 4-dimensional tensor with a shape of :math:`NCHW`,
the channel feature map refers to a 2-dimensional feature map with the shape of :math:`HW`).
For example, the :math:`j\_th` channel of the :math:`i\_th` sample in the batched input is a to-be-processed
`2D` tensor input[i,j].
Each channel will be zeroed out independently on every forward call which based on Bernoulli distribution
probability `p`.
The parper `Dropout: A Simple Way to Prevent Neural Networks from Overfitting
<http://www.cs.toronto.edu/~rsalakhu/papers/srivastava14a.pdf>`_ mentioned this technology, And it is proved that
it can effectively reduce over fitting and prevent neuronal coadaptation.
For more details, refer to `Improving neural networks by preventing co-adaptation of feature detectors
<https://arxiv.org/pdf/1207.0580.pdf>`_ .
`dropout2d` can improve the independence between channel feature maps.
Args:
input (Tensor): A `4D` tensor with shape :math:`(N, C, H, W)`, where `N` is the batch size, `C` is the number
of channels, `H` is the feature height, and `W` is the feature width. The data type must be int8,
int16, int32, int64, float16, float32 or float64.
p (float): The dropping probability of a channel, between 0 and 1, e.g. `p` = 0.8,
which means dropping out 80% of channels. Default: ``0.5`` .
training(bool): If `training` is True, applying dropout, otherwise, not applying. Default: ``True`` .
Returns:
Tensor, output, with the same shape and data type as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not int8, int16, int32, int64, float16, float32 or float64.
TypeError: If the data type of `p` is not float.
ValueError: If `p` is out of the range `[0.0, 1.0]`.
ValueError: If `input` shape is not `4D`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.ones([2, 1, 2, 3]), mindspore.float32)
>>> output = ops.dropout2d(input, 0.5)
>>> print(output.shape)
(2, 1, 2, 3)
"""
check_bool_const(training, "training", "dropout2d")
if training is False:
return input
dropout_2d_op = NN_OPS.Dropout2D(1.0 - p)
out, _ = dropout_2d_op(input)
return out
[文档]def dropout3d(input, p=0.5, training=True):
r"""
During training, randomly zeroes some channels of the input tensor
with probability `p` from a Bernoulli distribution(For a 5-dimensional tensor
with a shape of :math:`NCDHW`, the channel feature map refers to a 3-dimensional
feature map with a shape of :math:`DHW`).
For example, the :math:`j\_th` channel of the :math:`i\_th` sample in the batched input is a to-be-processed
`3D` tensor input[i,j].
Each channel will be zeroed out independently on every forward call which based on Bernoulli distribution
probability `p`.
`dropout3d` can improve the independence between channel feature maps.
Args:
input (Tensor): A `5D` tensor with shape :math:`(N, C, D, H, W)`, where `N` is the batch size, `C` is the number
of channels, `D` is the feature depth, `H` is the feature height, and `W` is the feature width.
The data type must be int8, int16, int32, int64, float16, float32 or float64.
p (float): The dropping probability of a channel, between 0 and 1, e.g. `p` = 0.8,
which means dropping out 80% of channels. Default: ``0.5`` .
training(bool): If `training` is True, applying dropout, otherwise, not applying. Default: ``True`` .
Returns:
Tensor, output, with the same shape and data type as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not int8, int16, int32, int64, float16, float32 or float64.
TypeError: If the data type of `p` is not float.
ValueError: If `p` is out of the range `[0.0, 1.0]`.
ValueError: If `input` shape is not 5D.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.ones([2, 1, 2, 1, 2]), mindspore.float32)
>>> output = ops.dropout3d(input, 0.5)
>>> print(output.shape)
(2, 1, 2, 1, 2)
"""
check_bool_const(training, "training", "dropout3d")
if training is False:
return input
dropout_3d_op = NN_OPS.Dropout3D(1.0 - p)
out, _ = dropout_3d_op(input)
return out
@_primexpr
def _check_float_range_inc_neither(arg_value, lower_limit, upper_limit, arg_name=None, prim_name=None):
"""
Method for checking whether input value is in float range inc neither.
"""
return validator.check_float_range(arg_value, lower_limit, upper_limit, validator.INC_NEITHER, arg_name, prim_name)
def _check_fractional_output_size_ratio(output_size, output_ratio, cls_name):
"""Internal function, used to check whether fractional_max_pool can specify the output shape."""
if output_ratio is None and output_size is None:
raise ValueError(f"For {cls_name}, 'output_size' and 'output_ratio' can not be None"
f"at the same time, but got {output_ratio} and {output_size} .")
def fractional_max_pool2d(input, kernel_size, output_size=None, output_ratio=None, return_indices=False,
_random_samples=None):
r"""
Applies the 2D FractionalMaxPool operation over `input`. The output Tensor shape can be determined by either
`output_size` or `output_ratio`, and the step size is determined by `_random_samples`. `output_size` will take
effect when `output_size` and `output_ratio` are set at the same time.
And `output_size` and `output_ratio` can not be ``None`` at the same time.
Refer to the paper `Fractional MaxPooling by Ben Graham <https://arxiv.org/abs/1412.6071>`_ for more details.
Args:
input (Tensor): Tensor of shape :math:`(N, C, H_{in}, W_{in})` or :math:`(C, H_{in}, W_{in})`,
with float16, float32, float64, int32, int64 data type.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value,
is an int number that represents height and width of the kernel, or a tuple
of two int numbers that represent height and width respectively.
The value must be a positive integer.
output_size (Union[int, tuple[int]], optional): The shape of the target `output_size`,
is an int number that represents height and width, or a tuple
of two int numbers that represent height and width respectively.
The value must be a positive integer.
Default: ``None``.
output_ratio (Union[float, tuple[float]], optional): The ratio of target output shape to input shape.
Specifying the size of the output tensor by using a ratio of the input size.
Data type: float16, float32, double, and value is between (0, 1).
Default: ``None``.
return_indices (bool, optional): Whether to return the indices of max value. Default: ``False``.
_random_samples (Tensor, optional): The random step of fractional_max_pool2d, which is a 3D tensor.
Tensor of data type: float16, float32, double, and value is between [0, 1).
Supported shape :math:`(N, C, 2)` or :math:`(1, C, 2)`.
Default: ``None``, the values of `_random_samples`
will be randomly distributed using uniform distribution over an interval [0,1).
Returns:
- **y** (Tensor) - Has the same type as the `input`.
Has the shape :math:`(N, C, H_{out}, W_{out})` or :math:`(C, H_{out}, W_{out})` ,
where :math:`(H_{out}, W_{out})` = `output_size`
or :math:`(H_{out}, W_{out})` = `output_ratio` * :math:`(H_{in}, W_{in})`.
- **argmax** (Tensor) - The indices along with the outputs, which is a Tensor, with the same shape as the
`y` and int64 data type. It will output only when `return_indices` is True.
Raises:
TypeError: If data type of `input` is not one of the following: float16, float32, float64, int32, int64.
TypeError: If data type of `_random_samples` is not one of the following: float16, float32, float64.
ValueError: If `kernel_size` is not a number and `kernel_size` is not a tuple of length 2.
ValueError: If `output_size` is not a number and `output_size` is not a tuple of length 2.
ValueError: If the sum of `kernel_size` , `output_size` and -1 is larger than the corresponding
dimension of `input`.
ValueError: If the dimension of `_random_samples` is not 3.
ValueError: if `output_size` and `output_ratio` are None at the same time.
ValueError: If the first dimension size of `input` and `_random_samples` is not equal.
ValueError: If the second dimension size of `input` and `_random_samples` is not equal.
ValueError: If the third dimension size of `_random_samples` is not 2.
Supported Platforms:
``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> from mindspore import dtype as mstype
>>> input = Tensor(np.array([0.3220, 0.9545, 0.7879, 0.0975, 0.3698,
... 0.5135, 0.5740, 0.3435, 0.1895, 0.8764,
... 0.9581, 0.4760, 0.9014, 0.8522, 0.3664,
... 0.4980, 0.9673, 0.9879, 0.6988, 0.9022,
... 0.9304, 0.1558, 0.0153, 0.1559, 0.9852]).reshape([1, 1, 5, 5]), mstype.float32)
>>> _random_samples = Tensor(np.array([[[0.8, 0.8]]]), mstype.float32)
>>> y, argmax = ops.fractional_max_pool2d(input, kernel_size=2, output_size=(2, 2),
... _random_samples=_random_samples, return_indices=True)
>>> print(y)
[[[[0.9545 0.8764]
[0.9673 0.9852]]]]
>>> print(argmax)
[[[[ 1 9]
[16 24]]]]
>>> y, argmax = ops.fractional_max_pool2d(input, kernel_size=2, output_ratio=(0.5, 0.5),
... _random_samples=_random_samples, return_indices=True)
>>> print(y)
[[[[0.9545 0.8764]
[0.9673 0.9852]]]]
>>> print(argmax)
[[[[ 1 9]
[16 24]]]]
"""
_check_fractional_output_size_ratio(output_size, output_ratio, "fractional_max_pool2d")
_check_value_type("return_indices", return_indices, [bool], "fractional_max_pool2d")
dim_flag = False
if input.ndim == 3:
input = input.expand_dims(axis=0)
dim_flag = True
if _random_samples is None:
if input.dtype in mstype.float_type:
_random_samples = ops.rand(input.shape[0], input.shape[1], 2, dtype=input.dtype)
else:
_random_samples = ops.rand(input.shape[0], input.shape[1], 2)
if output_size is None:
if isinstance(output_ratio, (float, int)):
_check_value_type("output_ratio", output_ratio, [float], "fractional_max_pool2d")
output_ratio = (output_ratio, output_ratio)
_check_float_range_inc_neither(output_ratio[0], 0.0, 1.0, "output_ratio[0]", "fractional_max_pool2d")
_check_float_range_inc_neither(output_ratio[1], 0.0, 1.0, "output_ratio[1]", "fractional_max_pool2d")
output_size = (int(input.shape[-2] * output_ratio[0]), int(input.shape[-1] * output_ratio[1]))
fractional_max_pool = FractionalMaxPoolWithFixedKsize(kernel_size, output_size)
output = fractional_max_pool(input, _random_samples)
if dim_flag:
output = output[0].squeeze(axis=0), output[1].squeeze(axis=0)
if return_indices:
return output
return output[0]
[文档]def fractional_max_pool3d(input, kernel_size, output_size=None, output_ratio=None, return_indices=False,
_random_samples=None):
r"""
Applies the 3D FractionalMaxPool operation over `input`. The output Tensor shape can be determined by either
`output_size` or `output_ratio`, and the step size is determined by `_random_samples`. `output_size` will take
effect when `output_size` and `output_ratio` are set at the same time.
And `output_size` and `output_ratio` can not be ``None`` at the same time.
Refer to the paper `Fractional MaxPooling by Ben Graham <https://arxiv.org/abs/1412.6071>`_ for more details.
The input and output data format can be "NCDHW". N is the batch size, C is the number of channels,
D the feature depth, H is the feature height, and W is the feature width.
.. warning::
This is an experimental API that is subject to change or deletion.
Args:
input (Tensor): The input of FractionalMaxPool3d, which is a 4D or 5D tensor.
Tensor of data type: float16, float32, double.
Supported shape :math:`(N, C, D_{in}, H_{in}, W_{in})` or :math:`(C, D_{in}, H_{in}, W_{in})`.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value,
is an int number that represents depth, height and width of the kernel, or a tuple
of three int numbers that represent depth, height and width respectively.
The value must be a positive integer.
output_size (Union[int, tuple[int]], optional): The shape of the target `output_size`,
is an int number that represents depth, height and width, or a tuple
of three int numbers that represent depth, height and width respectively.
The value must be a positive integer.
Default: ``None`` .
output_ratio (Union[float, tuple[float]], optional): The ratio of target output shape to input shape.
Specifying the size of the output tensor by using a ratio of the input size.
Data type: float16, float32, double, and value is between (0, 1).
Default: ``None`` .
return_indices (bool, optional): Whether to return the indices of max value. Default: ``False`` .
_random_samples (Tensor, optional): The random step of fractional_max_pool3d, which is a 3D tensor.
Tensor of data type: float16, float32, double, and value is between [0, 1).
Supported shape :math:`(N, C, 3)` or :math:`(1, C, 3)` . Default: ``None``, the values of `_random_samples`
will be randomly distributed using uniform distribution over an interval [0,1).
Returns:
- **y** (Tensor) - A tensor, the output of FractionalMaxPool3d.
Has the same data type with `input`.
Has the shape :math:`(N, C, D_{out}, H_{out}, W_{out})` or :math:`(C, D_{out}, H_{out}, W_{out})` ,
where :math:`(D_{out}, H_{out}, W_{out})` = `output_size`
or :math:`(D_{out}, H_{out}, W_{out})` = `output_ratio` * :math:`(D_{in}, H_{in}, W_{in})` .
- **argmax** (Tensor) - The indices along with the outputs, which is a Tensor, with the same shape as the
`y` and int32 data type. It will output only when `return_indices` is True.
Raises:
TypeError: If `input` is not a 4D or 5D tensor.
TypeError: If `_random_samples` is not a 3D tensor.
TypeError: If data type of `input` is not float16, float32, double, int32, int64.
TypeError: If dtype of `_random_samples` is not float16, float32, double.
TypeError: If dtype of `argmax` is not int32, int64.
TypeError: if _random_samples to have the different dtypes as input.
ValueError: If `output_size` is a tuple and if `output_size` length is not 3.
ValueError: If `kernel_size` is a tuple and if `kernel_size` length is not 3.
ValueError: If numbers in `output_size` or `kernel_size` is not positive.
ValueError: if `output_size` and `output_ratio` are None at the same time.
ValueError: If the first dimension size of `input` and `_random_samples` is not equal.
ValueError: If the second dimension size of `input` and `_random_samples` is not equal.
ValueError: If the third dimension size of `_random_samples` is not 3.
Supported Platforms:
``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> from mindspore import dtype as mstype
>>> x = Tensor(np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16])
... .reshape([1, 1, 2, 2, 4]), mstype.float32)
>>> _random_samples = Tensor(np.array([0.7, 0.7, 0.7]).reshape([1, 1, 3]), mstype.float32)
>>> output, argmax = ops.fractional_max_pool3d(x, kernel_size=(1, 1, 1), output_size=(1, 1, 3),
... _random_samples=_random_samples, return_indices=True)
>>> print(output)
[[[[[13. 14. 16.]]]]]
>>> print(argmax)
[[[[[12 13 15]]]]]
>>> output, argmax = ops.fractional_max_pool3d(x, kernel_size=(1, 1, 1), output_ratio=(0.5, 0.5, 0.5),
... _random_samples=_random_samples, return_indices=True)
>>> print(output)
[[[[[13. 16.]]]]]
>>> print(argmax)
[[[[[12 15]]]]]
"""
_check_fractional_output_size_ratio(output_size, output_ratio, "fractional_max_pool3d")
_check_value_type("return_indices", return_indices, [bool], "fractional_max_pool3d")
if _random_samples is None:
n = 1 if input.ndim == 4 else input.shape[0]
if input.dtype in mstype.float_type:
_random_samples = ops.rand(n, input.shape[-4], 3, dtype=input.dtype)
else:
_random_samples = ops.rand(n, input.shape[-4], 3)
if input.ndim == 4:
_random_samples = _random_samples.transpose(1, 0, 2)
if output_size is None:
if isinstance(output_ratio, (float, int)):
_check_value_type("output_ratio", output_ratio, [float], "fractional_max_pool3d")
output_ratio = (output_ratio, output_ratio, output_ratio)
_check_float_range_inc_neither(output_ratio[0], 0.0, 1.0, "output_ratio[0]", "fractional_max_pool3d")
_check_float_range_inc_neither(output_ratio[1], 0.0, 1.0, "output_ratio[1]", "fractional_max_pool3d")
_check_float_range_inc_neither(output_ratio[2], 0.0, 1.0, "output_ratio[2]", "fractional_max_pool3d")
output_size = (int(input.shape[-3] * output_ratio[0]), int(input.shape[-2] * output_ratio[1]),
int(input.shape[-1] * output_ratio[2]))
if input.dtype != _random_samples.dtype:
raise TypeError(f"For 'fractional_max_pool3d', 'input' and '_random_samples' must be same dtype, "
f"but got Tensor[{input.dtype}] and Tensor[{_random_samples.dtype}].")
fractional_max_pool = FractionalMaxPool3DWithFixedKsize(kernel_size, output_size)
output = fractional_max_pool(input, _random_samples)
if return_indices:
return output
return output[0]
[文档]def kl_div(logits, labels, reduction='mean'):
r"""
Computes the Kullback-Leibler divergence between the logits and the labels.
For input tensors :math:`x` and :math:`target` with the same shape, the updating formulas of KLDivLoss algorithm are
as follows,
.. math::
L(x, target) = target \cdot (\log target - x)
Then,
.. math::
\ell(x, target) = \begin{cases}
L(x, target), & \text{if reduction} = \text{'none';}\\
\operatorname{mean}(L(x, target)), & \text{if reduction} = \text{'mean';}\\
\operatorname{sum}(L(x, target)) / x.\operatorname{shape}[0], & \text{if reduction} = \text{'batchmean';}\\
\operatorname{sum}(L(x, target)), & \text{if reduction} = \text{'sum'.}
\end{cases}
where :math:`x` represents `logits`.
:math:`target` represents `labels`.
:math:`\ell(x, target)` represents `output`.
Note:
- Currently it does not support float64 input on `Ascend`.
- The output aligns with the mathematical definition of Kullback-Leibler divergence
only when `reduction` is set to ``'batchmean'``.
Args:
logits (Tensor): The input Tensor. The data type must be float16, float32 or float64.
labels (Tensor): The label Tensor which has the same shape and data type as `logits`.
reduction (str): Specifies the reduction to be applied to the output.
Its value must be one of ``'none'`` , ``'mean'`` , ``'batchmean'`` or ``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
- ``'batchmean'``: the summed output elements divided by batch size.
Returns:
Tensor or Scalar, if `reduction` is ``'none'``, then output is a tensor and has the same shape as `logits`.
Otherwise, it is a scalar.
Raises:
TypeError: If `reduction` is not a str.
TypeError: If neither `logits` nor `labels` is a Tensor.
TypeError: If dtype of `logits` or `labels` is not the supported type.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> logits = Tensor(np.array([0.2, 0.7, 0.1]), mindspore.float32)
>>> labels = Tensor(np.array([0., 1., 0.]), mindspore.float32)
>>> output = mindspore.ops.kl_div(logits, labels, 'mean')
>>> print(output)
-0.23333333
"""
if not isinstance(reduction, str):
raise ValueError("For 'kl_div', the 'reduction' must be str and must be in "
f"'['none', 'mean', 'batchmean', 'sum']', but got '{reduction}'.")
if reduction == 'batchmean':
kl_div_sum = _get_cache_prim(P.KLDivLoss)(reduction='sum')(logits, labels)
shape = shape_(logits)
batch_size = shape[0]
return kl_div_sum / batch_size
if reduction == 'mean':
kl_div_sum = _get_cache_prim(P.KLDivLoss)(reduction='sum')(logits, labels)
shape = shape_(logits)
total_size = 1
for dim in shape:
total_size = total_size * dim
return kl_div_sum / total_size
return _get_cache_prim(P.KLDivLoss)(reduction=reduction)(logits, labels)
[文档]def hardshrink(x, lambd=0.5):
r"""
Hard Shrink activation function. Calculates the output according to the input elements.
The formula is defined as follows:
.. math::
\text{HardShrink}(x) =
\begin{cases}
x, & \text{ if } x > \lambda \\
x, & \text{ if } x < -\lambda \\
0, & \text{ otherwise }
\end{cases}
HShrink Activation Function Graph:
.. image:: ../images/HShrink.png
:align: center
Args:
x (Tensor): The input of Hard Shrink with data type of float16 or float32.
lambd (float, optional): The threshold :math:`\lambda` defined by the Hard Shrink formula.
Default: ``0.5`` .
Returns:
Tensor, has the same data type and shape as the input `x`.
Raises:
TypeError: If `lambd` is not a float.
TypeError: If `x` is not a tensor.
TypeError: If dtype of `x` is neither float16 nor float32.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[ 0.5, 1, 2.0], [0.0533,0.0776,-2.1233]]), mindspore.float32)
>>> output = ops.hardshrink(x)
>>> print(output)
[[ 0. 1. 2. ]
[ 0. 0. -2.1233]]
"""
hshrink_op = _get_cache_prim(P.HShrink)(lambd)
return hshrink_op(x)
@constexpr
def _check_axis_in_range(axis, ndim):
"""Checks axes are with the bounds of ndim"""
if not isinstance(axis, int):
raise TypeError(f'The dims must be integers, but got {type(axis)}')
if not -ndim <= axis < ndim:
raise ValueError(f"The 'axis' must be in the range of [-{ndim}, {ndim}), but got {axis}.")
return axis % ndim
@constexpr
def _check_axis_valid(axes, ndim):
"""
Checks axes are valid given ndim, and returns axes that can be passed
to the built-in operator (non-negative, int or tuple)
"""
if axes is None:
raise ValueError(f"The parameter dims can not be None.")
if isinstance(axes, (tuple, list)):
axes = tuple(map(lambda x: _check_axis_in_range(x, ndim), axes))
if any(axes.count(el) > 1 for el in axes):
raise ValueError(f"The element of parameter 'dims' can not be duplicate, but got {axes}.")
return axes
raise ValueError(f"The parameter dims must be tuple of ints, but got {type(axes)}")
def _get_flip_start(ndim, shape, axes):
"""Calculate the start index of flip"""
return tuple([shape[i] - 1 if i in axes else 0 for i in range(ndim)])
def _get_flip_end(ndim, shape, axes):
"""Calculate the end index of flip"""
return tuple([-shape[i] - 1 if i in axes else shape[i] + 1 for i in range(ndim)])
@constexpr
def _get_flip_strides(ndim, axes):
"""Calculate the strides of flip"""
return tuple([-1 if i in axes else 1 for i in range(ndim)])
def _is_shape_empty(shp):
"""Check whether shape contains zero"""
if isinstance(shp, int):
return shp == 0
return ops.shape_mul(shp) == 0
def _check_input_tensor(arg_name, *tensors):
"""Check whether the input is tensor"""
for tensor in tensors:
if not isinstance(tensor, Tensor):
raise TypeError(f"For '{arg_name}', the input must be Tensor, but got {ops.typeof(tensor)}")
return True
[文档]def flip(input, dims):
"""
Reverses the order of elements in a tensor along the given axis.
The shape of the tensor is preserved, but the elements are reordered.
Args:
input (Tensor): Input tensor.
dims (Union[list[int], tuple[int]]): Axis or axes along which to flip over.
Flipping is performed on all of the axes specified in the tuple,
If `dims` is a tuple of integers contains negative, it counts from the last to the first axis.
Returns:
Tensor, with the entries of `dims` reversed.
Raises:
TypeError: If the input is not a tensor.
ValueError: If `dims` is None.
ValueError: If `dims` is not a list/tuple of ints.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import ops
>>> import numpy as np
>>> input = mindspore.Tensor(np.arange(1, 9).reshape((2, 2, 2)))
>>> output = ops.flip(input, (0, 2))
>>> print(output)
[[[6 5]
[8 7]]
[[2 1]
[4 3]]]
"""
res = reverse_v2_impl(input, dims)
return res
[文档]def flipud(input):
"""
Flips the elements of each column in the up/down direction, while preserving the rows of the input tensor.
Args:
input (Tensor): Input array.
Returns:
Tensor after the flip.
Raises:
TypeError: If the input is not a tensor.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> import numpy as np
>>> input = ms.Tensor(np.arange(1, 9).reshape((2, 2, 2)))
>>> output = ops.flipud(input)
>>> print(output)
[[[5 6]
[7 8]]
[[1 2]
[3 4]]]
"""
return flip(input, (0,))
[文档]def fliplr(input):
"""
Flips the elements of each row in the left/right direction, while preserving the columns of the input tensor.
Args:
input (Tensor): Input tensor.
Returns:
Tensor after the flip.
Raises:
TypeError: If the input is not a tensor.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> import numpy as np
>>> input = ms.Tensor(np.arange(1, 9).reshape((2, 2, 2)))
>>> output = ops.fliplr(input)
>>> print(output)
[[[3 4]
[1 2]]
[[7 8]
[5 6]]]
"""
return flip(input, (1,))
[文档]def is_floating_point(input):
"""
Judge whether the data type of `input` is a floating point data type i.e., one of mindspore.float64,
mindspore.float32, mindspore.float16.
Args:
input (Tensor): The input Tensor.
Returns:
Bool. If the dtype of `input` is a floating point data type, return ``True`` . Otherwise, return ``False`` .
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> from mindspore import Tensor
>>> x = ms.Tensor([1, 2, 3], ms.float32)
>>> y = ms.Tensor([1, 2, 3], ms.int64)
>>> output = ops.is_floating_point(x)
>>> output2 = ops.is_floating_point(y)
>>> print(output)
True
>>> print(output2)
False
"""
return input.dtype in [mstype.float32, mstype.bfloat16, mstype.float16, mstype.float64]
[文档]def hardswish(x):
r"""
Applies hswish-type activation element-wise. The input is a Tensor with any valid shape.
Hard swish is defined as:
.. math::
\text{hswish}(x_{i}) = x_{i} * \frac{ReLU6(x_{i} + 3)}{6}
where :math:`x_i` is an element of the input Tensor.
HSwish Activation Function Graph:
.. image:: ../images/HSwish.png
:align: center
Args:
x (Tensor): The input to compute the Hard Swish.
Returns:
Tensor, has the same data type and shape as the input.
Raises:
TypeError: If `x` is not a Tensor.
TypeError: If dtype of `x` is not int or float.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([-1, -2, 0, 2, 1]), mindspore.float16)
>>> output = ops.hardswish(x)
>>> print(output)
[-0.3333 -0.3333 0 1.666 0.6665]
"""
return hardswish_(x)
def _is_dim_unknown(shape):
return isinstance(shape, tuple) and -2 in shape
@_primexpr
def _interploate_make_tuple(rank, value):
"""
make tuple in dynamic scenarios
"""
s = tuple_to_tensor_((rank,), mstype.int32)
v = None
if isinstance(value, int):
v = F.scalar_to_tensor(value, mstype.int64)
else:
v = F.scalar_to_tensor(value, mstype.float32)
t = fillv2_(s, v)
out = tensor_to_tuple_(t)
return out
@_primexpr
def _interpolate_scale_factor_convert_size(shape, scale_factor):
"""
convert scale_factor to size
"""
x = tuple_to_tensor_(shape[2:], mstype.int64)
y = tuple_to_tensor_(scale_factor, mstype.float32)
t = x * y
t = ops.TruncateDiv()(t, Tensor(1))
t = ops.cast(t, mstype.int64)
return tensor_to_tuple_(t)
def _interpolate_size_check_with_rank(size, input_rank):
"""
size rank check
"""
if len(size) != input_rank - 2:
raise ValueError(
f"For 'interpolate', 'input' and 'size' must have the same spatial dimensions, "
f"but got 'input' is {input_rank - 2}D, 'size' is {len(size)}D")
def _interpolate_scale_factor_check_with_rank(scale_factor, input_rank):
"""
scale_factor rank check
"""
if len(scale_factor) != input_rank - 2:
raise ValueError(
f"For 'interpolate', 'input' and 'scale_factor' must have the same spatial dimensions, "
f"but got 'input' is {input_rank - 2}D, 'scale_factor' is {len(scale_factor)}D"
)
def _interpolate_mode_check(mode, supported_dict):
"""
mode check
"""
if isinstance(mode, list) or mode not in supported_dict:
raise ValueError(
f"For 'interpolate', 'mode' must be in '{list(supported_dict)}', but got {mode}"
)
def _interpolate_rank_check(input_rank, mode, supported_dict):
"""
rank check
"""
if input_rank not in supported_dict.get(mode):
raise ValueError(
f"For 'interpolate', {mode} only support '{list(supported_dict.get(mode, {}))}'D, but got {input_rank}D"
)
def _interpolate_scale_factor_check(scale_factor, mode, rank, supported_dict):
"""
scale_factor check
"""
if scale_factor is not None and "scale_factor" not in supported_dict.get(
mode, {}).get(rank):
raise ValueError(
f"For 'interpolate', 'scale_factor' option cannot currently be set with the "
f"mode = {mode} and dim = {rank}D.")
def _interpolate_align_corners_mode_check(rank, mode, supported_dict):
"""
align_corners check
"""
if "align_corners" not in supported_dict.get(mode, {}).get(rank):
raise ValueError(
f"For 'interpolate', 'align_corners' option cannot currently be set with the "
f"mode = {mode}, and dim = {rank}D")
[文档]def interpolate(input,
size=None,
scale_factor=None,
mode="nearest",
align_corners=None,
recompute_scale_factor=None):
r"""
Samples the input Tensor to the given size or scale_factor by using one of the interpolate algorithms.
Args:
input (Tensor): Tensor to be resized.
Input tensor must be a 3-D, 4-D, or 5-D tensor with shape
:math:`(N, C, [optional D], [optional H], W)` , with data type of float.
size (Union[int, tuple[int], list[int]], optional): The target size.
If size is a tuple or list, its length should be the same as the number of dimensions in input
after removing the first two dimensions N, C.
One and only one of size and scale_factor can be set to None. Default: ``None`` .
scale_factor (Union[float, tuple[float], list[float]], optional): The scale factor of new size of the tensor.
If scale_factor is a tuple or list, its length should be the same as the number of dimensions in input
after removing the first two dimensions N, C.
One and only one of size and scale_factor can be set to None. Default: ``None`` .
mode (str): The sampling algorithm.
One of 'nearest', 'linear' (3D only), 'bilinear' (4D only), 'trilinear' (5D only), 'bicubic' (4D only),
'area', 'nearest-exact'(matches Scikit-Image and PIL nearest neighbours interpolation algorithms and fixes
knows issues with `nearest`, 3D and 4D). Default: ``"nearest"`` .
align_corners (bool): Whether to use corner alignment for coordinate mapping. Assuming a transformation is
applied to the input Tensor along the x-axis, the specific calculation formula is as follows:
.. code-block::
ori_i = new_length != 1 ? new_i * (ori_length - 1) / (new_length - 1) : 0 # 'align_corners' = True
ori_i = new_length > 1 ? (new_i + 0.5) * ori_length / new_length - 0.5 : 0 # 'align_corners' = False
Among them, :math:`ori\_length` and :math:`new\_length` represent the length of the Tensor before and after
transformation along the x-axis respectively; :math:`new\_i` represents the coordinate of the i-th element
along the x-axis after transformation; :math:`ori\_i` represents
the corresponding coordinate of the original
data along the x-axis.
This is only valid for ``'linear'``, ``'bilinear'``, or ``'bicubic'`` modes. Default: ``False`` .
recompute_scale_factor (bool, optional): Recalculate `scale_factor`.
If True, the parameter `size` will be calculated using the value of the `scale_factor`,
and finally scaled using the value of `size`.
If False, the value of `size` or `scale_factor` will be used for direct interpolation. Default: ``None`` .
.. note::
The 'nearest-exact' mode is the same as the nearest-neighbor interpolation algorithm used in
scikit-image and PIL. The 'nearest' mode produces the same results as the INTER_NEAREST interpolation
algorithm used in OpenCV.
Args Support List and Supported Platforms:
+---------------+-----------+---------------+--------------+----------------+
| mode | input.dim | align_corners | scale_factor | device |
+===============+===========+===============+==============+================+
| nearest | 3 | \- | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 4 | \- | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 5 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| linear | 3 | √ | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| bilinear | 4 | √ | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| bicubic | 4 | √ | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| area | 3 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 4 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 5 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| nearest-exact | 3 | \- | × | Ascend,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 4 | \- | × | Ascend,CPU |
+---------------+-----------+---------------+--------------+----------------+
| trilinear | 5 | √ | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
- `-` indicates that there is no such parameter.
- `×` indicates that this parameter is not currently supported.
- `√` indicates that this parameter is supported.
Returns:
Tensor, resized, whose dimensions and dtype are the same as `input`.
Raises:
TypeError: `input` is not a Tensor.
ValueError: Both `size` and `scale_factor` are not empty.
ValueError: Both `size` and `scale_factor` are empty.
ValueError: When `size` is a tuple or list, its length is not equal to `input.ndim - 2`.
ValueError: When `scale_factor` is a tuple or list, its length is not equal to `input.ndim - 2`.
ValueError: `mode` is not in the list of supported modes.
ValueError: `input.ndim` is not in the list of supported dimensions for the corresponding mode.
ValueError: `size` is not empty, `recompute_scale_factor` is not empty.
ValueError: `scale_factor` is not in the corresponding list of supported values.
ValueError: `align_corners` is not in the corresponding list of supported values.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> input = Tensor([[[1, 2, 3], [4, 5, 6]]], mindspore.float32)
>>> output = ops.interpolate(input, size=(6,), mode='nearest')
>>> print(output)
[[[1. 1. 2. 2. 3. 3.]
[4. 4. 5. 5. 6. 6.]]]
"""
def run_nearest(x, size, align_corners=None, scale_factor=None):
# 3D 4D use ResizeNearestNeighborV2, 5D use UpsampleNearest3D
x_rank = F.rank(x)
if size is not None and x_rank == 3:
t1 = seq.TupleToTensor()(size[:1], mstype.int32)
t2 = Tensor([1], mstype.int32)
size = F.concat([t1, t2])
x = x.unsqueeze(-1)
x = _get_cache_prim(P.ResizeNearestNeighborV2)()(
x, size)
x = _get_cache_prim(P.Squeeze)(-1)(x)
elif size is not None and x_rank == 4:
size = seq.TupleToTensor()(size[:2], mstype.int32)
x = _get_cache_prim(P.ResizeNearestNeighborV2)()(
x, size)
else:
x = _get_cache_prim(P.UpsampleNearest3D)()(x, size, scale_factor)
return x
def run_linear(x, size, align_corners=None, scale_factor=None):
coordinate_transformation_mode = "align_corners" if align_corners else "half_pixel"
resize = _get_cache_prim(
P.image_ops.ResizeLinear1D)(coordinate_transformation_mode)
return resize(x, size)
def run_bilinear(x, size, align_corners=None, scale_factor=None):
resize = _get_cache_prim(P.ResizeBilinearV2)(align_corners,
not align_corners)
return resize(x, size)
def run_trilinear(x, size, align_corners=None, scale_factor=None):
resize = _get_cache_prim(
P.nn_ops.UpsampleTrilinear3D)(align_corners=align_corners)
return resize(x, size, scale_factor)
def run_bicubic(x, size, align_corners=None, scale_factor=None):
resize = _get_cache_prim(P.image_ops.ResizeBicubic)(
align_corners=align_corners, half_pixel_centers=not align_corners)
size = seq.TupleToTensor()(size, mstype.int32)
x = resize(x, size)
return x
def run_area(x, size, align_corners=None, scale_factor=None):
x_rank = F.rank(x)
if x_rank == 3:
x = ops.adaptive_avg_pool1d(x, size[0])
elif x_rank == 4:
x = ops.adaptive_avg_pool2d(x, tuple(size))
else:
x = ops.adaptive_avg_pool3d(x, tuple(size))
return x
def run_nearest_exact(x, size, align_corners=None, scale_factor=None):
x_rank = F.rank(x)
if x_rank == 3:
size = seq.TupleToTensor()((size[0], 1), mstype.int32)
# For impl of nearest 3D use 4D.
x = x.unsqueeze(-1)
resize = _get_cache_prim(P.ResizeNearestNeighborV2)(
align_corners=False,
half_pixel_centers=True)
x = resize(x, size)
x = _get_cache_prim(P.Squeeze)(-1)(x)
if x_rank == 4:
if isinstance(size, int):
size = F.scalar_to_tensor(size, mstype.int32)
elif isinstance(size, tuple):
size = seq.TupleToTensor()(size, mstype.int32)
else:
size = seq.ListToTensor()(size, mstype.int32)
resize = _get_cache_prim(P.ResizeNearestNeighborV2)(
align_corners=False,
half_pixel_centers=True)
x = resize(x, size)
return x
supported_dict = {
"nearest": {
3: (),
4: (),
5: ("scale_factor",)
},
"linear": {
3: ("align_corners",)
},
"bilinear": {
4: ("align_corners",)
},
"bicubic": {
4: ("align_corners",)
},
"area": {
3: ("scale_factor",),
4: ("scale_factor",),
5: ("scale_factor",)
},
"nearest-exact": {
3: (),
4: ()
},
"trilinear": {
5: (
"align_corners",
"scale_factor",
)
},
}
resize_func = {
"nearest": run_nearest,
"linear": run_linear,
"bilinear": run_bilinear,
"bicubic": run_bicubic,
"trilinear": run_trilinear,
"area": run_area,
"nearest-exact": run_nearest_exact,
}
if not isinstance(input, Tensor):
raise TypeError(
f"For 'interpolate', 'input' must be a tensor, but got {type(input)}"
)
if isinstance(size, list):
size = tuple(size)
if isinstance(scale_factor, list):
scale_factor = tuple(scale_factor)
rank = F.rank(input)
shape = F.shape(input)
dim_unknown = _is_dim_unknown(shape)
# check for size and scale_factor
if size is not None and scale_factor is not None:
raise ValueError(
"For 'interpolate', 'size' and 'scale_factor' cannot be set simultaneously"
)
if size is not None:
if isinstance(size, (list, tuple)):
check_positive_int_sequence_const(size, "size", "interpolate")
if dim_unknown is False:
_interpolate_size_check_with_rank(size, rank)
else:
check_positive_int_const(size, "size", "interpolate")
if dim_unknown is False:
size = tuple([size for _ in range(rank - 2)])
else:
size = _interploate_make_tuple(rank - 2, size)
elif scale_factor is not None:
if isinstance(scale_factor, (list, tuple)):
check_positive_float_sequence_const(scale_factor, "scale_factor",
"interpolate")
if dim_unknown is False:
_interpolate_scale_factor_check_with_rank(scale_factor, rank)
else:
check_positive_float_const(scale_factor, "scale_factor",
"interpolate")
if dim_unknown is False:
scale_factor = tuple([scale_factor for _ in range(rank - 2)])
else:
scale_factor = _interploate_make_tuple(rank - 2, scale_factor)
else:
raise ValueError(
"For 'interpolate', 'size' and 'scale_factor' cannot be both empty"
)
# rank check
_interpolate_mode_check(mode, supported_dict)
if dim_unknown is False:
_interpolate_rank_check(rank, mode, supported_dict)
# "area" mode always requires an explicit size rather than scale factor.
if mode == "area" and size is None:
recompute_scale_factor = True
# recompute_scale_factor
if recompute_scale_factor is not None and recompute_scale_factor:
check_bool_const(recompute_scale_factor, "recompute_scale_factor",
"interpolate")
if size is not None:
raise ValueError(
"For 'interpolate', it is incorrect to set 'recompute_scale_factor' to True"
" after specifying an explicit 'size'.")
if F.isconstant(shape) and F.isconstant(scale_factor):
tuple_len = min(len(shape) - 2, len(scale_factor))
size = tuple([floor(shape[i + 2] * scale_factor[i])
for i in range(tuple_len)])
else:
size = _interpolate_scale_factor_convert_size(shape, scale_factor)
scale_factor = None
else:
if dim_unknown is False:
_interpolate_scale_factor_check(scale_factor, mode, rank,
supported_dict)
# align_corners
if align_corners is not None:
check_bool_const(align_corners, "align_corners", "interpolate")
if dim_unknown is False:
_interpolate_align_corners_mode_check(rank, mode, supported_dict)
else:
align_corners = False
return resize_func.get(mode)(input, size, align_corners, scale_factor)
def _interploate_ext_make_tuple(input, value):
"""
make tuple
"""
if isinstance(value, (list, tuple)):
return value
rank = F.rank(input) - 2
out = None
if F.isconstant(value) and F.isconstant(rank):
out = tuple([value for _ in range(rank)])
else:
s = tuple_to_tensor_((rank,), mstype.int32)
v = None
if isinstance(value, int):
v = F.scalar_to_tensor(value, mstype.int64)
else:
v = F.scalar_to_tensor(value, mstype.float32)
t = fillv2_(s, v)
out = tensor_to_tuple_(t)
return out
def _interpolate_ext_scale_factor_convert_size(input, scale_factor):
"""
convert scale_factor to size
"""
shape = F.shape(input)
size = None
if F.isconstant(shape) and F.isconstant(scale_factor):
tuple_len = min(len(shape) - 2, len(scale_factor))
size = tuple([floor(shape[i + 2] * scale_factor[i])
for i in range(tuple_len)])
else:
x = tuple_to_tensor_(shape[2:], mstype.int64)
y = tuple_to_tensor_(scale_factor, mstype.float32)
t = x * y
t = ops.TruncateDiv()(t, Tensor(1))
t = ops.cast(t, mstype.int64)
size = tensor_to_tuple_(t)
return size
def interpolate_ext(input,
size=None,
scale_factor=None,
mode="nearest",
align_corners=None,
recompute_scale_factor=None):
r"""
Samples the input Tensor to the given size or scale_factor by using one of the interpolate algorithms.
.. note::
- In 'linear' mode, backpropagation does not support scenarios where `scale_factor` is not None
and `align_corners` is False.
Args:
input (Tensor): Tensor to be resized.
Input tensor must be a 3-D, 4-D, or 5-D tensor with shape
:math:`(N, C, [optional D], [optional H], W)` , with data type of float.
size (Union[int, tuple[int], list[int]], optional): The target size.
If size is a tuple or list, its length should be the same as the number of dimensions in input
after removing the first two dimensions N, C.
One and only one of size and scale_factor can be set to None. Default: ``None`` .
scale_factor (Union[float, tuple[float], list[float]], optional): The scale factor of new size of the tensor.
If scale_factor is a tuple or list, its length should be the same as the number of dimensions in input
after removing the first two dimensions N, C.
One and only one of size and scale_factor can be set to None. Default: ``None`` .
mode (str): The sampling algorithm.
One of 'nearest', 'linear' (3D only), 'bilinear' (4D only), 'trilinear' (5D only), 'bicubic' (4D only),
'area', 'nearest-exact'(matches Scikit-Image and PIL nearest neighbours interpolation algorithms and fixes
knows issues with `nearest`, 3D and 4D). Default: ``"nearest"`` .
align_corners (bool): Whether to use corner alignment for coordinate mapping. Assuming a transformation is
applied to the input Tensor along the x-axis, the specific calculation formula is as follows:
.. code-block::
ori_i = new_length != 1 ? new_i * (ori_length - 1) / (new_length - 1) : 0 # 'align_corners' = True
ori_i = new_length > 1 ? (new_i + 0.5) * ori_length / new_length - 0.5 : 0 # 'align_corners' = False
Among them, :math:`ori\_length` and :math:`new\_length` represent the length of the Tensor before and after
transformation along the x-axis respectively; :math:`new\_i` represents the coordinate of the i-th element
along the x-axis after transformation; :math:`ori\_i` represents
the corresponding coordinate of the original
data along the x-axis.
This is only valid for ``'linear'``, ``'bilinear'``, or ``'bicubic'`` modes. Default: ``False`` .
recompute_scale_factor (bool, optional): Recalculate `scale_factor`.
If True, the parameter `size` will be calculated using the value of the `scale_factor`,
and finally scaled using the value of `size`.
If False, the value of `size` or `scale_factor` will be used for direct interpolation. Default: ``None`` .
.. note::
The 'nearest-exact' mode is the same as the nearest-neighbor interpolation algorithm used in
scikit-image and PIL. The 'nearest' mode produces the same results as the INTER_NEAREST interpolation
algorithm used in OpenCV.
Args Support List and Supported Platforms:
+---------------+-----------+---------------+--------------+----------------+
| mode | input.dim | align_corners | scale_factor | device |
+===============+===========+===============+==============+================+
| nearest | 3 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 4 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 5 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| linear | 3 | √ | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| bilinear | 4 | √ | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| bicubic | 4 | √ | × | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| area | 3 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 4 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 5 | \- | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
| nearest-exact | 3 | \- | × | Ascend,CPU |
+---------------+-----------+---------------+--------------+----------------+
| | 4 | \- | × | Ascend,CPU |
+---------------+-----------+---------------+--------------+----------------+
| trilinear | 5 | √ | √ | Ascend,GPU,CPU |
+---------------+-----------+---------------+--------------+----------------+
- `-` indicates that there is no such parameter.
- `×` indicates that this parameter is not currently supported.
- `√` indicates that this parameter is supported.
Returns:
Tensor, resized, whose dimensions and dtype are the same as `input`.
Raises:
TypeError: `input` is not a Tensor.
ValueError: Both `size` and `scale_factor` are not empty.
ValueError: Both `size` and `scale_factor` are empty.
ValueError: When `size` is a tuple or list, its length is not equal to `input.ndim - 2`.
ValueError: When `scale_factor` is a tuple or list, its length is not equal to `input.ndim - 2`.
ValueError: `mode` is not in the list of supported modes.
ValueError: `input.ndim` is not in the list of supported dimensions for the corresponding mode.
ValueError: `size` is not empty, `recompute_scale_factor` is not empty.
ValueError: `scale_factor` is not in the corresponding list of supported values.
ValueError: `align_corners` is not in the corresponding list of supported values.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, mint
>>> input = Tensor([[[1, 2, 3], [4, 5, 6]]], mindspore.float32)
>>> output = mint.interpolate(input, size=(6,), mode='nearest')
>>> print(output)
[[[1. 1. 2. 2. 3. 3.]
[4. 4. 5. 5. 6. 6.]]]
"""
def run_nearest(x, size, align_corners=None, scale_factor=None):
x_rank = F.rank(x)
if x_rank == 3:
x = _get_cache_prim(ops.auto_generate.UpsampleNearest1D)()(
x, size, scale_factor)
elif x_rank == 4:
x = _get_cache_prim(ops.auto_generate.UpsampleNearest2D)()(
x, size, scale_factor)
else:
x = _get_cache_prim(P.UpsampleNearest3D)()(x, size, scale_factor)
return x
def run_linear(x, size, align_corners=None, scale_factor=None):
out = _get_cache_prim(
ops.auto_generate.UpsampleLinear1D)()(x, size, scale_factor, align_corners)
return out
def run_bilinear(x, size, align_corners=None, scale_factor=None):
out = _get_cache_prim(
ops.auto_generate.UpsampleBilinear2D)()(x, size, scale_factor, align_corners)
return out
def run_trilinear(x, size, align_corners=None, scale_factor=None):
resize = _get_cache_prim(P.nn_ops.UpsampleTrilinear3D)(align_corners)
return resize(x, size, scale_factor)
def run_bicubic(x, size, align_corners=None, scale_factor=None):
resize = _get_cache_prim(P.image_ops.ResizeBicubic)(
align_corners=align_corners, half_pixel_centers=not align_corners)
x = resize(x, size)
return x
def run_area(x, size, align_corners=None, scale_factor=None):
x_rank = F.rank(x)
if x_rank == 3:
x = F.adaptive_avg_pool1d(x, size[0])
elif x_rank == 4:
x = F.adaptive_avg_pool2d(x, tuple(size))
else:
x = F.adaptive_avg_pool3d(x, tuple(size))
return x
def run_nearest_exact(x, size, align_corners=None, scale_factor=None):
x_rank = F.rank(x)
if x_rank == 3:
size = size[:1] + (1,)
# For impl of nearest 3D use 4D.
x = x.unsqueeze(-1)
resize = _get_cache_prim(P.ResizeNearestNeighborV2)(
align_corners=False,
half_pixel_centers=True)
x = resize(x, size)
x = _get_cache_prim(P.Squeeze)(-1)(x)
if x_rank == 4:
resize = _get_cache_prim(P.ResizeNearestNeighborV2)(
align_corners=False,
half_pixel_centers=True)
x = resize(x, size)
return x
resize_funcs = {
"nearest": run_nearest,
"linear": run_linear,
"bilinear": run_bilinear,
"bicubic": run_bicubic,
"trilinear": run_trilinear,
"area": run_area,
"nearest-exact": run_nearest_exact,
}
# mode check
if mode not in resize_funcs:
raise ValueError(
f"For 'interpolate', 'mode' must be in '{list(resize_funcs)}', but got {mode}"
)
if mode in ("nearest", "area", "nearest-exact"):
if align_corners is not None:
raise ValueError("align_corners option can only be set with the "
"interpolating modes: linear | bilinear | bicubic | trilinear"
)
else:
if align_corners is None:
align_corners = False
# check for size and scale_factor
if size is not None and scale_factor is not None:
raise ValueError(
"For 'interpolate', 'size' and 'scale_factor' cannot be set simultaneously"
)
if size is not None:
size = _interploate_ext_make_tuple(input, size)
elif scale_factor is not None:
scale_factor = _interploate_ext_make_tuple(input, scale_factor)
else:
raise ValueError(
"For 'interpolate', 'size' and 'scale_factor' cannot be both empty"
)
# "area" mode always requires an explicit size rather than scale factor.
if mode == "area" and size is None:
recompute_scale_factor = True
# recompute_scale_factor
if recompute_scale_factor is not None and recompute_scale_factor:
if size is not None:
raise ValueError(
"For 'interpolate', it is incorrect to set 'recompute_scale_factor' to True"
" after specifying an explicit 'size'.")
size = _interpolate_ext_scale_factor_convert_size(input, scale_factor)
scale_factor = None
# scale_factor
if mode in ("bilinear", "bicubic", "nearest-exact"):
if scale_factor is not None:
raise ValueError("scale_factor option can only be set with the "
"interpolating modes: nearest | linear | area | trilinear"
)
return resize_funcs.get(mode)(input, size, align_corners, scale_factor)
[文档]def upsample(input, size=None, scale_factor=None, mode="nearest", align_corners=None, recompute_scale_factor=None):
r"""
Alias for :func:`mindspore.ops.interpolate` .
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
"""
return interpolate(input, size, scale_factor, mode, align_corners, recompute_scale_factor)
[文档]def softsign(x):
r"""
SoftSign activation function.
The function is shown as follows:
.. math::
\text{SoftSign}(x) = \frac{x}{1 + |x|}
Softsign Activation Function Graph:
.. image:: ../images/Softsign.png
:align: center
Args:
x (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of
additional dimensions, with float16 or float32 data type.
Returns:
Tensor, with the same type and shape as the `x`.
Raises:
TypeError: If `x` is not a Tensor.
TypeError: If dtype of `x` is neither float16 nor float32.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([0, -1, 2, 30, -30]), mindspore.float32)
>>> output = ops.softsign(x)
>>> print(output)
[ 0. -0.5 0.6666667 0.9677419 -0.9677419]
"""
return softsign_(x)
[文档]def soft_margin_loss(input, target, reduction='mean'):
r"""
Calculate the soft margin loss of input and target.
Creates a criterion that optimizes a two-class classification
logistic loss between input tensor :math:`x` and target tensor :math:`y`
(containing 1 or -1).
.. math::
\text{loss}(x, y) = \sum_i \frac{\log(1 + \exp(-y[i]*x[i]))}{\text{x.nelement}()}
where :math:`x.nelement()` is the number of elements of :math:`x`.
.. warning::
This is an experimental API that is subject to change or deletion.
Args:
input (Tensor): Predict data. Data type must be float16 or float32.
target (Tensor): Ground truth data, with the same type and shape as `input`.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Outputs:
Tensor or Scalar. If `reduction` is ``'none'``, its shape is the same as `input`.
Otherwise, a scalar value will be returned.
Raises:
TypeError: If `input` or `target` is not a Tensor.
TypeError: If dtype of `input` or `target` is neither float16 nor float32.
ValueError: If shape of `input` is not the same as that of `target`.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'`` or ``'sum'``.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> logits = Tensor(np.array([[0.3, 0.7], [0.5, 0.5]]), mindspore.float32)
>>> labels = Tensor(np.array([[-1, 1], [1, -1]]), mindspore.float32)
>>> output = ops.soft_margin_loss(logits, labels)
>>> print(output)
0.6764238
"""
soft_margin_loss_op = _get_cache_prim(P.SoftMarginLoss)(reduction=reduction)
output = soft_margin_loss_op(input, target)
return output
[文档]def softmax(input, axis=-1, *, dtype=None):
r"""
Applies the Softmax operation to the input tensor on the specified axis.
Suppose a slice in the given axis :math:`axis`, then for each element :math:`input_i`,
the Softmax function is shown as follows:
.. math::
\text{output}(input_i) = \frac{\exp(input_i)}{\sum_{j = 0}^{N-1}\exp(input_j)},
where :math:`N` is the length of the tensor.
Args:
input (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of
additional dimensions, with float16 or float32 data type.
axis (int, optional): The axis to perform the Softmax operation. Default: ``-1`` .
Keyword Args:
dtype (:class:`mindspore.dtype`, optional): When set, `input` will be converted to the specified type,
`dtype`, before execution, and dtype of returned Tensor will also be `dtype`. Default: ``None`` .
Returns:
Tensor, with the same type and shape as the `input`.
Raises:
TypeError: If `axis` is not an int.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.array([1, 2, 3, 4, 5]), mindspore.float32)
>>> output = ops.softmax(input)
>>> print(output)
[0.01165623 0.03168492 0.08612854 0.23412167 0.6364086 ]
"""
if not isinstance(axis, int):
type_axis = type(axis).__name__
raise TypeError(f" the type of 'axis' must be 'int', but got '{axis}' with type '{type_axis}'.")
if dtype is not None:
input = ops.cast(input, dtype)
softmax_ = _get_cache_prim(P.Softmax)(axis)
return softmax_(input)
[文档]def softmax_ext(input, dim=None, dtype=None):
r"""
Applies the Softmax operation to the input tensor on the specified axis.
Suppose a slice in the given axis :math:`dim`, then for each element :math:`input_i`,
the Softmax function is shown as follows:
.. math::
\text{output}(input_i) = \frac{\exp(input_i)}{\sum_{j = 0}^{N-1}\exp(input_j)},
where :math:`N` is the length of the tensor.
Args:
input (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of
additional dimensions.
dim (int, optional): The dim to perform the Softmax operation. Default: ``None`` .
Keyword Args:
dtype (:class:`mindspore.dtype`, optional): When set, `input` will be converted to the specified type,
`dtype`, before execution, and dtype of returned Tensor will also be `dtype`. Default: ``None`` .
Returns:
Tensor, with the same type and shape as the `input`.
Raises:
TypeError: If `dim` is not an int.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.array([1, 2, 3, 4, 5]), mindspore.float32)
>>> output = ops.function.nn_func.softmax_ext(input)
>>> print(output)
[0.01165623 0.03168492 0.08612854 0.23412167 0.6364086 ]
"""
dim = -1 if dim is None else dim
if not isinstance(dim, int):
type_dim = type(dim).__name__
raise TypeError(f" the type of 'dim' must be 'int', but got '{dim}' with type '{type_dim}'.")
if dtype is not None:
input = ops.cast(input, dtype)
softmax_ = _get_cache_prim(P.Softmax)(dim)
return softmax_(input)
[文档]def softmin(x, axis=-1, *, dtype=None):
r"""
Applies the Softmin operation to the input tensor on the specified axis.
Suppose a slice in the given axis :math:`x`, then for each element :math:`x_i`,
the Softmin function is shown as follows:
.. math::
\text{output}(x_i) = \frac{\exp(-x_i)}{\sum_{j = 0}^{N-1}\exp(-x_j)},
where :math:`N` is the length of the tensor.
Args:
axis (Union[int, tuple[int]], optional): The axis to perform the Softmin operation. Default: ``-1`` .
x (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of
additional dimensions, with float16 or float32 data type.
Keyword Args:
dtype (:class:`mindspore.dtype`, optional): When set, `x` will be converted to the specified type,
`dtype`, before execution, and dtype of returned Tensor will also be `dtype`. Default: ``None`` .
Returns:
Tensor, with the same type and shape as `x`.
Raises:
TypeError: If `axis` is not an int or a tuple.
TypeError: If dtype of `x` is neither float16 nor float32.
ValueError: If `axis` is a tuple whose length is less than 1.
ValueError: If `axis` is a tuple whose elements are not all in range [-len(logits.shape), len(logits.shape)).
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([-1, -2, 0, 2, 1]), mindspore.float16)
>>> output = ops.softmin(x)
>>> print(output)
[0.2341 0.636 0.0862 0.01165 0.03168 ]
"""
if dtype is not None:
x = ops.cast(x, dtype)
softmax_ = _get_cache_prim(P.Softmax)(axis)
return softmax_(-1*x)
[文档]def softshrink(x, lambd=0.5):
r"""
Applies the Softshrink function element-wise.
.. math::
\text{SoftShrink}(x) =
\begin{cases}
x - \lambda, & \text{ if } x > \lambda \\
x + \lambda, & \text{ if } x < -\lambda \\
0, & \text{ otherwise }
\end{cases}
SoftShrink Activation Function Graph:
.. image:: ../images/Softshrink.png
:align: center
Args:
x (Tensor): The input of soft shrink with data type of float16 or float32.
lambd (float): The :math:`\lambda` must be no less than zero. Default: ``0.5`` .
Returns:
Tensor, has the same shape and data type as `x`.
Raises:
TypeError: If `lambd` is not a float.
TypeError: If `x` is not a Tensor.
TypeError: If dtype of `x` is neither float16 nor float32.
ValueError: If `lambd` is less than 0.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor
>>> from mindspore import ops
>>> import numpy as np
>>> x = Tensor(np.array([[ 0.5297, 0.7871, 1.1754], [ 0.7836, 0.6218, -1.1542]]), mindspore.float32)
>>> output = ops.softshrink(x)
>>> print(output)
[[ 0.02979 0.287 0.676 ]
[ 0.2837 0.1216 -0.6543 ]]
"""
soft_shrink_op = _get_cache_prim(P.SoftShrink)(lambd)
return soft_shrink_op(x)
def soft_shrink(input, lambd=0.5):
r"""
`soft_shrink` is deprecated, please use `softshrink` instead.
"""
logger.warning("`soft_shrink` is deprecated, please use `softshrink` instead.")
soft_shrink_op = _get_cache_prim(P.SoftShrink)(lambd)
return soft_shrink_op(input)
def softplus(input, beta=1, threshold=20): # pylint:disable=redefined-outer-name
r"""
Applies softplus function to `input` element-wise.
The softplus function is shown as follows, x is the element of `input` :
.. math::
\text{output} = \frac{1}{beta}\log(1 + \exp(\text{beta * x}))
When :math:`input * beta > threshold`, the implementation converts to the linear function
to ensure numerical stability.
Args:
input (Tensor) - Tensor of any dimension.
Supported dtypes:
- GPU/CPU: float16, float32, float64.
- Ascend: float16, float32.
beta (int, optional) - The :math:`\beta` value in softplus function. Default: ``1`` .
threshold (int, optional) - When :math:`input * beta > threshold`, converting softplus to a linear function.
Default: ``20`` .
Returns:
Tensor, with the same type and shape as the `input` .
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If the dtype of `input` is not float16, float32 or float64.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.array([0.1, 0.2, 30, 25]), mindspore.float32)
>>> output = ops.softplus(input)
>>> print(output)
[0.7443967 0.79813886 30. 25.]
"""
scaling_input = beta * input
op_output = (1 / beta) * softplus_(scaling_input)
return ops.select(input * beta > threshold, input, op_output)
[文档]def selu(input_x):
r"""
Activation function SeLU (Scaled exponential Linear Unit).
The activation function is defined as:
.. math::
E_{i} =
scale *
\begin{cases}
x_{i}, &\text{if } x_{i} \geq 0; \cr
\text{alpha} * (\exp(x_i) - 1), &\text{otherwise.}
\end{cases}
where :math:`alpha` and :math:`scale` are pre-defined constants(:math:`alpha=1.67326324`
and :math:`scale=1.05070098`).
See more details in `Self-Normalizing Neural Networks <https://arxiv.org/abs/1706.02515>`_.
SeLU Activation Function Graph:
.. image:: ../images/SeLU.png
:align: center
Args:
input_x (Tensor): Tensor of any dimension,
the data type is int8, int32, float16, float32, or float64 (CPU, GPU only).
Returns:
Tensor, with the same type and shape as the `input_x`.
Raises:
TypeError: If dtype of `input_x` is not int8, int32, float16, float32, or float64.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.array([[-1.0, 4.0, -8.0], [2.0, -5.0, 9.0]]), mindspore.float32)
>>> output = ops.selu(input_x)
>>> print(output)
[[-1.1113307 4.202804 -1.7575096]
[ 2.101402 -1.7462534 9.456309 ]]
"""
return selu_(input_x)
[文档]def logsigmoid(x):
r"""
Applies logsigmoid activation element-wise. The input is a Tensor with any valid shape.
Logsigmoid is defined as:
.. math::
\text{logsigmoid}(x_{i}) = \log(\frac{1}{1 + \exp(-x_i)}),
where :math:`x_{i}` is the element of the input.
LogSigmoid Activation Function Graph:
.. image:: ../images/LogSigmoid.png
:align: center
Args:
x (Tensor): The input of LogSigmoid with data type of float16 or float32.
The shape is :math:`(N,*)` where :math:`*` means, any number of additional dimensions.
Returns:
Tensor, with the same type and shape as the `x`.
Raises:
TypeError: If dtype of `x` is neither float16 nor float32.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([1.0, 2.0, 3.0]), mindspore.float32)
>>> output = ops.logsigmoid(x)
>>> print(output)
[-0.31326166 -0.12692806 -0.04858734]
"""
output = sigmoid_(x)
ret = log_(output)
return ret
def _check_dense_add_bias_shape(input_shape, output_shape, bias_shape):
"""Check that the output has the correct shape after adding bias."""
if input_shape != output_shape:
raise ValueError(f"For dense, the bias shape {bias_shape} does not match the input shape {input_shape}.")
@_primexpr
def check_dense_inputs_same_shape(input1_shape, input2_shape, prim_name=None):
"""check bidense input Tensors' shape"""
msg_prefix = f"For '{prim_name}', the" if prim_name else "The"
if input1_shape[:-1] != input2_shape[:-1]:
raise ValueError(f"{msg_prefix} dimensions except the last of 'input1' must be same as 'input2', but got "
f"{input1_shape} of 'input1' and {input2_shape} of 'input2'")
[文档]def bidense(input1, input2, weight, bias=None):
r"""
Applies bilinear dense connected layer for `input1` and `input2`. The bilinear dense function is defined as:
.. math::
output = x_{1}^{T}Ax_{2} + b
:math:`x_{1}` represents `input1` , :math:`x_{2}` represents `input2` , :math:`A` represents `weight` ,
:math:`b` represents `bias` .
.. warning::
This is an experimental API that is subject to change or deletion.
Args:
input1 (Tensor): Input Tensor of shape :math:`(*, in1\_channels)`,
where :math:`*` means any number of additional dimensions. All but the last dimension
should be the same with `input2`.
input2 (Tensor): Input Tensor of shape :math:`(*, in2\_channels)`,
where :math:`*` means any number of additional dimensions. All but the last dimension
should be the same with `input1`.
weight (Tensor): The weight applied to the input1 and input2.
The shape is :math:`(out\_channels, in1\_channels, in2\_channels)`.
bias (Tensor, optional): Additive biases to the output.
The shape is :math:`(out\_channels)` or :math:`()`. Defaults: ``None`` , the `bias` is 0.
Returns:
Tensor, shape :math:`(*, out\_channels)`, where :math:`*` means any number of additional dimensions.
All but the last dimension should be the same with the input Tensors.
Raises:
TypeError: If `input1` is not Tensor.
TypeError: If `input2` is not Tensor.
TypeError: If `weight` is not Tensor.
TypeError: If `bias` is not Tensor.
ValueError: If dimensions except the last of 'input1' are different from 'input2' .
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> input1 = mindspore.Tensor([[-1.1283, 1.2603],
... [0.0214, 0.7801],
... [-1.2086, 1.2849]], mindspore.float32)
>>> input2 = mindspore.Tensor([[-0.4631, 0.3238, 0.4201],
... [0.6215, -1.0910, -0.5757],
... [-0.7788, -0.0706, -0.7942]], mindspore.float32)
>>> weight = mindspore.Tensor([[[-0.3132, 0.9271, 1.1010],
... [0.6555, -1.2162, -0.2987]],
... [[1.0458, 0.5886, 0.2523],
... [-1.3486, -0.8103, -0.2080]],
... [[1.1685, 0.5569, -0.3987],
... [-0.4265, -2.6295, 0.8535]],
... [[0.6948, -1.1288, -0.6978],
... [0.3511, 0.0609, -0.1122]]], mindspore.float32)
>>> output = ops.bidense(input1, input2, weight)
>>> print(output)
[[-2.0612743 0.5581219 0.22383511 0.8667302]
[1.4476739 0.12626505 1.6552988 0.21297503]
[0.6003161 2.912046 0.5590313 -0.35449564]]
"""
_check_is_tensor("input1", input1, "bidense")
_check_is_tensor("input2", input2, "bidense")
_check_is_tensor("weight", weight, "bidense")
_check_is_tensor("bias", bias, "bidense")
input1_shape = input1.shape
input2_shape = input2.shape
check_dense_inputs_same_shape(input1_shape, input2_shape, "bidense")
if len(input1_shape) != 2:
input1 = input1.reshape((-1, input1_shape[-1]))
input2 = input2.reshape((-1, input2_shape[-1]))
batch_size = input1.shape[0]
output = matmul_(input1, weight.transpose(1, 2, 0).view(input1_shape[-1], -1))
output = output.view(batch_size, input2_shape[-1], weight.shape[0])
output = output.transpose(2, 0, 1) * input2
output = output.sum(2).swapaxes(0, 1)
if bias is not None:
if input1.dtype != bias.dtype or input2.dtype != bias.dtype:
raise TypeError(f"For 'bidense', the dtype of 'bias', 'input1' and 'input2' must be the same,"
f" but got {bias.dtype}, {input1.dtype} and {input2.dtype}.")
output = bias_add_(output.astype(bias.dtype), bias)
if len(input1_shape) != 2:
output_shape = input1_shape[:-1] + (-1,)
output = output.reshape(output_shape)
return output
[文档]def pdist(input, p=2.0):
r"""
Calculates the distance between every pair of row vectors in
the input using the p-norm. If the input `input` is a 2D Tensor with shape :math:`(N, M)`,
the `output` must be a 1D Tensor with shape :math:`(N * (N - 1) / 2,)`.
.. math::
y[n] = \sqrt[p]{{\mid x_{i} - x_{j} \mid}^p}
where :math:`x_{i}, x_{j}` are two different row vectors in the input.
Args:
input (Tensor): Input tensor. dtype: float16, float32 or float64.
p (float): The order of norm distance, :math:`p∈[0, ∞)`. Default: ``2.0`` .
Returns:
Tensor, has the same dtype as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not float16, float32 or float64.
TypeError: If `p` is not a float.
ValueError: If `p` is a negative float.
ValueError: If dimension of `input` is less than 2.
Supported Platforms:
``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[1.0, 1.0], [2.0, 2.0], [3.0, 3.0]]).astype(np.float32))
>>> y = ops.pdist(x, p=2.0)
>>> print(y)
[1.4142135 2.828427 1.4142135]
"""
pdist_ = _get_cache_prim(NN_OPS.Pdist)(p=p)
return pdist_(input)
def _circular_pad(input_x, padding):
"""circular pad"""
if isinstance(padding, tuple):
padding = tuple_to_tensor_(padding, mstype.int64)
elif isinstance(padding, list):
padding = list_to_tensor_(padding, mstype.int64)
is_expand = False
if padding.shape[0] // 2 + 1 == input_x.ndim:
input_x = input_x.expand_dims(0)
is_expand = True
out = PadV3(mode="circular", paddings_contiguous=True)(input_x, padding, None)
if is_expand:
out = out.squeeze(0)
return out
def _reflection_pad(input, pad):
"""reflection pad"""
out = input
if len(pad) == 2:
out = reflection_pad_1d_op(input, pad)
elif len(pad) == 4:
out = reflection_pad_2d_op(input, pad)
else:
out = reflection_pad_3d_op(input, pad)
return out
def _replication_pad(input, pad):
"""replication pad"""
out = input
if len(pad) == 2:
out = replication_pad_1d_op(input, pad)
elif len(pad) == 4:
out = replication_pad_2d_op(input, pad)
else:
out = replication_pad_3d_op(input, pad)
return out
[文档]def pad_ext(input, pad, mode='constant', value=0.0):
r"""
Pads the input tensor according to the pad.
.. warning::
`circular` mode has poor performance and is not recommended.
Args:
input (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of additional dimensions.
pad (Union[tuple[int], list[int], Tensor]): Filling position of pad.
:math:`\left\lfloor\frac{\text{len(pad)}}{2}\right\rfloor` dimensions
of `input` will be padded.
Example: to pad only the last dimension of the input tensor, then
:attr:`pad` has the form
:math:`(\text{padding_left}, \text{padding_right})`;
Example: to pad the last 2 dimensions of the input tensor, then use
:math:`(\text{padding_left}, \text{padding_right}, \text{padding_top}, \text{padding_bottom})`;
Example: to pad the last 3 dimensions, use
:math:`(\text{padding_left}, \text{padding_right}, \text{padding_top}, \text{padding_bottom},
\text{padding_front}, \text{padding_back})` and so on.
mode (str, optional): Pad filling mode, ``'constant'`` , ``'reflect'`` , ``'replicate'`` or ``'circular'`` .
Default: ``'constant'`` .
For ``'constant'`` mode, please refer to :class:`mindspore.nn.ConstantPad1d` as an example to understand
this filling pattern and extend the padding pattern to n dimensions.
For ``'reflect'`` mode, please refer to :class:`mindspore.nn.ReflectionPad1d` as an example to understand
this filling pattern.
The reflect mode is used to pad the last three dimensions of 4D or 5D input, the last two dimensions of 3D
or 4D input, or the last dimension of 2D or 3D input.
For ``'replicate'`` mode, please refer to :class:`mindspore.nn.ReplicationPad1d` as an example to understand
this filling pattern.
The replicate mode is used to pad the last three dimensions of 4D or 5D input, the last two dimensions of 3D
or 4D input, or the last dimension of 2D or 3D input.
For ``'circular'`` mode, the pixels from one edge of the image are wrapped around to the opposite edge,
such that the pixel on the right edge of the image is replaced with the pixel on the left edge,
and the pixel on the bottom edge is replaced with the pixel on the top edge.
The circular mode is used to pad the last three dimensions of 4D or 5D input, the last two dimensions of 3D
or 4D input, or the last dimension of 2D or 3D input.
value (Union[int, float, None], optional): Valid only in ``'constant'`` mode.
Set the padding value in ``'constant'`` mode. If the value is None, 0 is used as the default padding value.
Default: ``0.0`` .
Returns:
Tensor, the tensor after padding.
Raises:
TypeError: If `pad` is not an int of tuple or int of list.
TypeError: If `input` is not a Tensor.
ValueError: If length of `pad` is not even.
ValueError: If length of `pad` is greater than 6.
ValueError: If `mode` is not ``'constant'`` and `value` not ``None``.
Supported Platforms:
``Ascend``
Examples:
>>> from mindspore import ops
>>> import numpy as np
>>> x = ms.Tensor(np.arange(1 * 2 * 2 * 2).reshape((1, 2, 2, 2)), dtype=ms.float64)
>>> output = ops.function.nn_func.pad_ext(x, [1, 0, 0, 1], mode='constant', value=6.0)
>>> print(output)
[[[[6. 0. 1.]
[6. 2. 3.]
[6. 6. 6.]]
[[6. 4. 5.]
[6. 6. 7.]
[6. 6. 6.]]]]
"""
if not isinstance(input, Tensor):
raise TypeError(f"For 'pad', the type of 'input' must be Tensor, but got {type(input)}.")
out = input
if (isinstance(pad, tuple) and not pad):
return out
if mode == "constant":
value = 0 if value is None else value
out = constant_pad_nd_op(input, pad, value)
else:
if value != 0.0:
raise ValueError(f"Padding mode {mode} doesn\'t take in value argument.")
if mode == "circular":
out = _circular_pad(input, pad)
elif mode == "reflect":
out = _reflection_pad(input, pad)
elif mode == "replicate":
out = _replication_pad(input, pad)
else:
raise ValueError(f"Pad filling mode must be 'constant' 'circular' 'reflect' or 'replicate'.")
return out
def _check_pad_inputs(padding):
"""check the input of pad"""
if len(padding) % 2 != 0:
raise ValueError(f"For 'pad', the size of padding must be divisible by 2, but got {len(padding)}")
if not isinstance(padding, (tuple, list)):
raise TypeError(f"For 'pad', the type of 'paddings' must be a tuple of int or list of int or a Tensor,"
f" but got {type(padding)}.")
for pd in padding:
if not isinstance(pd, int):
raise TypeError(f"For 'pad', the paddings value must be tuple of int or list of int, but got {padding}")
[文档]def pad(input_x, padding, mode='constant', value=None):
r"""
Pads the input tensor according to the padding.
Args:
input_x (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of additional dimensions
which is required to be no more than 5 in Ascend.
padding (Union[tuple[int], list[int], Tensor]): Filling position of pad where the negative value is not
supported while running in Ascend.
:math:`\left\lfloor\frac{\text{len(padding)}}{2}\right\rfloor` dimensions
of `input_x` will be padded.
Example: to pad only the last dimension of the input tensor, then
:attr:`padding` has the form
:math:`(\text{padding_left}, \text{padding_right})`;
Example: to pad the last 2 dimensions of the input tensor, then use
:math:`(\text{padding_left}, \text{padding_right}, \text{padding_top}, \text{padding_bottom})`;
Example: to pad the last 3 dimensions, use
:math:`(\text{padding_left}, \text{padding_right}, \text{padding_top}, \text{padding_bottom},
\text{padding_front}, \text{padding_back})` and so on.
mode (str, optional): Pad filling mode, ``'constant'`` , ``'reflect'`` , ``'replicate'`` or ``'circular'`` .
Default: ``'constant'`` .
For ``'constant'`` mode, please refer to :class:`mindspore.nn.ConstantPad1d` as an example to understand
this filling pattern and extend the padding pattern to n dimensions.
For ``'reflect'`` mode, please refer to :class:`mindspore.nn.ReflectionPad1d` as an example to understand
this filling pattern.
The reflect mode is used to pad the last two dimensions of 3D or 4D input, or the last dimension of 2D or
3D input.
For ``'replicate'`` mode, please refer to :class:`mindspore.nn.ReplicationPad1d` as an example to understand
this filling pattern.
The replicate mode is used to pad the last three dimensions of 4D or 5D input, the last two dimensions of 3D
or 4D input, or the last dimension of 2D or 3D input.
For ``'circular'`` mode, the pixels from one edge of the image are wrapped around to the opposite edge,
such that the pixel on the right edge of the image is replaced with the pixel on the left edge,
and the pixel on the bottom edge is replaced with the pixel on the top edge.
The circular mode is used to pad the last three dimensions of 4D or 5D input, the last two dimensions of 3D
or 4D input, or the last dimension of 2D or 3D input.
value (Union[int, float, None], optional): Valid only in ``'constant'`` mode.
Set the padding value in ``'constant'`` mode. If the value is None, 0 is used as the default padding value.
Default: ``None`` .
Returns:
Tensor, the tensor after padding.
Raises:
TypeError: If `padding` is not an int of tuple or int of list.
TypeError: If `input_x` is not a Tensor.
ValueError: If length of `padding` is not even.
ValueError: If length of `padding` is greater than 6.
ValueError: If `mode` is not ``'constant'`` and `value` not ``None``.
ValueError: If rank of `input_x` is more than 5 while running in Ascend.
ValueError: If `paddings` contains negative value while running in Ascend.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> import numpy as np
>>> x = ms.Tensor(np.arange(1 * 2 * 2 * 2).reshape((1, 2, 2, 2)), dtype=ms.float64)
>>> output = ops.pad(x, [1, 0, 0, 1], mode='constant', value=6.0)
>>> print(output)
[[[[6. 0. 1.]
[6. 2. 3.]
[6. 6. 6.]]
[[6. 4. 5.]
[6. 6. 7.]
[6. 6. 6.]]]]
>>> output1 = ops.pad(x, (1, 0, 0, 1), mode='reflect')
>>> print(output1)
[[[[1. 0. 1.]
[3. 2. 3.]
[1. 0. 1.]]
[[5. 4. 5.]
[7. 6. 7.]
[5. 4. 5.]]]]
>>> output2 = ops.pad(x, (1, 1, 2, 1), mode='replicate')
>>> print(output2)
[[[[0. 0. 1. 1.]
[0. 0. 1. 1.]
[0. 0. 1. 1.]
[2. 2. 3. 3.]
[2. 2. 3. 3.]]
[[4. 4. 5. 5.]
[4. 4. 5. 5.]
[4. 4. 5. 5.]
[6. 6. 7. 7.]
[6. 6. 7. 7.]]]]
>>> output3 = ops.pad(x, (1, 1, 2, 1), mode='circular')
>>> print(output3)
[[[[1. 0. 1. 0.]
[3. 2. 3. 2.]
[1. 0. 1. 0.]
[3. 2. 3. 2.]
[1. 0. 1. 0.]]
[[5. 4. 5. 4.]
[7. 6. 7. 6.]
[5. 4. 5. 4.]
[7. 6. 7. 6.]
[5. 4. 5. 4.]]]]
"""
if not isinstance(input_x, Tensor):
raise TypeError(f"For 'pad', the type of 'input_x' must be Tensor, but got {type(input_x)}.")
if (isinstance(padding, (tuple, list)) and not padding) or (isinstance(padding, Tensor) and padding.shape == (0,)):
return input_x
if not isinstance(padding, Tensor):
_check_pad_inputs(padding)
padding = tuple(padding)
is_expand = False
if mode == "constant":
value = 0 if value is None else value
if isinstance(value, (float, int)):
value = scalar_to_tensor_(value, input_x.dtype)
else:
if len(padding) > 6:
raise ValueError(f"For 'pad', the padding must be less than or equal to 6, but got {len(padding)}.")
if value is not None:
raise ValueError(f"For 'pad', the padding mode '{mode}' can not set value, but got value {value}.")
if mode == "replicate":
mode = "edge"
if len(padding) // 2 + 1 == input_x.ndim:
input_x = input_x.expand_dims(0)
is_expand = True
out = PadV3(mode=mode, paddings_contiguous=True)(input_x, padding, value)
if is_expand:
out = out.squeeze(0)
return out
[文档]def rrelu(input, lower=1.0 / 8, upper=1.0 / 3):
r"""
Randomized Leaky ReLU activation function.
The activation function is defined as:
.. math::
\text{rrelu}(input_{ji}) = \begin{cases}input_{ji}, &\text{if } input_{ji} \geq 0; \cr
{\alpha_{ji}} * input_{ji}, &\text{otherwise.}\end{cases}
where :math:`\alpha_{ji}` ~ :math:`U(l, u)`, :math:`l \le u`.
Applies the rrelu function elementally, as described in the paper:
`Empirical Evaluation of Rectified Activations in Convolution Network <https://arxiv.org/pdf/1505.00853.pdf>`_ .
Args:
input (Tensor): The input of rrelu is a Tensor of any dimension.
lower (Union[int, float]): Slope of the activation function at x < 0. Default: ``1.0 / 8`` .
upper (Union[int, float]): Slope of the activation function at x < 0. Default: ``1.0 / 3`` .
Returns:
Tensor, after rrelu, has the same type and shape as the `input`.
Raises:
TypeError: If `lower` is not a float or an int.
TypeError: If `upper` is not a float or an int.
TypeError: If `input` is not a Tensor.
TypeError: If `input` is not a Tensor of mindspore.float16 or mindspore.float32.
ValueError: If `lower` is greater than upper.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[-1.0, 4.0], [2.0, 0]]), mindspore.float32)
>>> output = ops.rrelu(x)
>>> print(output)
[[-0.31465699 4. ]
[ 2. 0. ]]
"""
if not isinstance(upper, (float, int)):
raise TypeError(f"For 'rrelu', 'upper' must be an int or a float, but got {type(upper)}")
if not isinstance(lower, (float, int)):
raise TypeError(f"For 'rrelu', 'lower' must be an int or a float, but got {type(lower)}")
if lower > upper:
raise ValueError(f"For 'rrelu', the value of 'upper' must be greater than or equal to 'lower', "
f"but got upper: {upper}, lower: {lower}. ")
if not isinstance(input, Tensor):
raise TypeError(f"For 'rrelu', the 'input' must be a Tensor but got {type(input)}.")
_lower = Tensor(lower, mstype.float32)
_upper = Tensor(upper, mstype.float32)
_size = input.shape
if ops.is_sequence_value_unknown(_size):
_size = tensor_shape_(input)
sign_matrix = sign_(input)
negative_filter = sign_matrix.clip(None, 0)
positive_filter = sign_matrix.clip(0, None)
input_dtype = dtype_(input)
mask = ops.uniform(_size, _lower, _upper).astype(input_dtype)
negative_mask = negative_filter * mask * -1
total_mask = negative_mask + positive_filter
out = total_mask * input
return out
def mirror_pad(input_x, paddings, mode):
"""
Pads the input tensor according to the paddings and mode.
Args:
input_x (Tensor): Tensor of shape :math:`(N, *)`, where :math:`*` means, any number of
additional dimensions.
paddings (Tensor): Paddings requires constant tensor. The value of `paddings` is a
matrix(list), and its shape is (N, 2). N is the rank of input data. All elements of paddings
are int type. For the input in the `D` th dimension, paddings[D, 0] indicates how many sizes
to be extended ahead of the input tensor in the `D` th dimension, and paddings[D, 1]
indicates how many sizes to be extended behind the input tensor in the `D` th dimension. Both
paddings[D, 0] and paddings[D, 1] must be no greater than input_x.dim_size(D)
(or input_x.dim_size(D) - 1) if mode is SYMMETRIC (if REFLECT, respectively).
mode (str): Specifies the padding mode. The optional values are "REFLECT" and "SYMMETRIC".
Default: "REFLECT".
Returns:
Tensor, the tensor after padding.
- If `mode` is "REFLECT", it uses a way of symmetrical copying through the axis of symmetry to fill in.
If the `input_x` is [[1,2,3], [4,5,6], [7,8,9]] and `paddings` is [[1,1], [2,2]], then the
`Outputs` is [[6,5,4,5,6,5,4], [3,2,1,2,3,2,1], [6,5,4,5,6,5,4], [9,8,7,8,9,8,7], [6,5,4,5,6,5,4]].
For a more intuitive understanding, please see the example below.
- If `mode` is "SYMMETRIC", the filling method is similar to the "REFLECT". It is also copied
according to the symmetry axis, except that it includes the symmetry axis. If the `input_x`
is [[1,2,3], [4,5,6], [7,8,9]] and `paddings` is [[1,1], [2,2]], then the `Outputs` is
[[2,1,1,2,3,3,2], [2,1,1,2,3,3,2], [5,4,4,5,6,6,5], [8,7,7,8,9,9,8], [8,7,7,8,9,9,8]].
For a more intuitive understanding, please see the example below.
Raises:
TypeError: If `input_x` or `paddings` is not a Tensor.
TypeError: If `mode` is not a str.
ValueError: If paddings.size is not equal to 2 * rank of input_x.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> from mindspore import Tensor, ops
>>> input_x = Tensor([[1,2,3], [4,5,6], [7,8,9]])
>>> mode = "REFLECT"
>>> paddings = Tensor([[1, 1], [2, 2]])
>>> output = ops.mirror_pad(input_x, paddings, mode)
>>> print(output)
[[6 5 4 5 6 5 4]
[3 2 1 2 3 2 1]
[6 5 4 5 6 5 4]
[9 8 7 8 9 8 7]
[6 5 4 5 6 5 4]]
"""
_mirror_pad = _get_cache_prim(P.MirrorPad)(mode)
return _mirror_pad(input_x, paddings)
def _innner_log_softmax(inputs, axis):
"""inner implementation of log_softmax, since the LogSoftmaxGrad op do not support inputs > 2d"""
return inputs - logsumexp(inputs, axis, True)
def _check_cross_entropy_inputs(input, target, weight, ignore_index, reduction, label_smoothing):
"""
Check inputs for cross_entropy().
"""
_check_is_tensor('input', input, "cross_entropy_loss")
_check_is_tensor('target', target, "cross_entropy_loss")
_check_is_tensor('weight', weight, "cross_entropy_loss")
check_int_const(ignore_index, 'ignore_index', "cross_entropy_loss")
check_non_negative_float_const(label_smoothing, 'label_smoothing', "cross_entropy_loss")
check_string_const(reduction, ['none', 'mean', 'sum'], 'reduction', "cross_entropy_loss")
if input.dtype not in [mstype.float64, mstype.float32, mstype.float16]:
raise TypeError(f'For cross_entropy, the input dtype should be mstype.float64, mstype.float32 or'
f'mstype.float16, but got dtype:{input.dtype}.')
[文档]def cross_entropy(input, target, weight=None, ignore_index=-100, reduction='mean', label_smoothing=0.0):
r"""
The cross entropy loss between input and target.
The cross entropy support two kind of targets:
- Class indices (int) in the range :math:`[0, C)` where :math:`C` is the number of classes,
the loss with reduction=none can be described as:
.. math::
\ell(x, y) = L = \{l_1,\dots,l_N\}^\top, \quad
l_n = - w_{y_n} \log \frac{\exp(x_{n,y_n})}{\sum_{c=1}^C \exp(x_{n,c})}
\cdot \mathbb{1}\{y_n \not= \text{ignore_index}\}
where :math:`x` is the inputs, :math:`y` is the target, :math:`w` is the weight, N is the batch size,
:math:`c` belonging to :math:`[0, C-1]` is class index, where :math:`C` is the number of classes.
If `reduction` is not ``None`` (default ``'mean'`` ), then
.. math::
\ell(x, y) = \begin{cases}
\sum_{n=1}^N \frac{1}{\sum_{n=1}^N w_{y_n} \cdot \mathbb{1}\{y_n \not= \text{ignore_index}\}} l_n, &
\text{if reduction} = \text{'mean',}\\
\sum_{n=1}^N l_n, &
\text{if reduction} = \text{'sum'.}
\end{cases}
- Probabilities (float) for each class, useful when labels beyond a single class per minibatch item
are required, the loss with reduction=none can be described as:
.. math::
\ell(x, y) = L = \{l_1,\dots,l_N\}^\top, \quad
l_n = - \sum_{c=1}^C w_c \log \frac{\exp(x_{n,c})}{\sum_{i=1}^C \exp(x_{n,i})} y_{n,c}
where :math:`x` is the inputs, :math:`y` is the target, :math:`w` is the weight, N is the batch size,
:math:`c` belonging to :math:`[0, C-1]` is class index, where :math:`C` is the number of classes.
If `reduction` is not ``None`` (default ``'mean'`` ), then
.. math::
\ell(x, y) = \begin{cases}
\frac{\sum_{n=1}^N l_n}{N}, &
\text{if reduction} = \text{'mean',}\\
\sum_{n=1}^N l_n, &
\text{if reduction} = \text{'sum'.}
\end{cases}
Args:
input (Tensor): :math:`(N)` or :math:`(N, C)` where `C = number of classes` or :math:`(N, C, H, W)`
in case of 2D Loss, or :math:`(N, C, d_1, d_2, ..., d_K)`.
`input` is expected to be log-probabilities, data type must be float16 or float32.
target (Tensor): For class indices, tensor of shape :math:`()`, :math:`(N)` or
:math:`(N, d_1, d_2, ..., d_K)` , data type must be int32. For probabilities, tensor of shape :math:`(C,)` ,
:math:`(N, C)` or :math:`(N, C, d_1, d_2, ..., d_K)` , data type must be float16 or float32 or float64.
weight (Tensor): A rescaling weight applied to the loss of each batch element.
If not None, the shape is :math:`(C,)`, data type must be float16 or float32. Default: ``None`` .
ignore_index (int): Specifies a target value that is ignored
and does not contribute to the input gradient. Default: ``-100`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the weighted mean of elements in the output.
- ``'sum'``: the output elements will be summed.
label_smoothing (float): Label smoothing values, a regularization tool used to prevent the model
from overfitting when calculating Loss. The value range is [0.0, 1.0]. Default value: ``0.0`` .
Returns:
Tensor, the computed loss value.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> # Case 1: Indices labels
>>> inputs = ms.Tensor(np.random.randn(3, 5), ms.float32)
>>> target = ms.Tensor(np.array([1, 0, 4]), ms.int32)
>>> output = ms.ops.cross_entropy(inputs, target)
>>> # Case 2: Probability labels
>>> inputs = ms.Tensor(np.random.randn(3, 5), ms.float32)
>>> target = ms.Tensor(np.random.randn(3, 5), ms.float32)
>>> output = ms.ops.cross_entropy(inputs, target)
"""
_check_cross_entropy_inputs(input, target, weight, ignore_index, reduction, label_smoothing)
class_dim = 0 if input.ndim == 1 else 1
if target.dtype in [mstype.float32, mstype.float16]:
return _cross_entropy(input, target, class_dim, weight, reduction, label_smoothing)
return nll_loss(_innner_log_softmax(input, class_dim), target, weight, ignore_index, reduction, label_smoothing)
def _cross_entropy(inputs, target, target_dim, weight=None, reduction='mean', label_smoothing=0.0):
"""cross entropy inner function"""
class_dim = 0 if inputs.ndim == 1 else 1
n_classes = inputs.shape[class_dim]
inputs = _innner_log_softmax(inputs, class_dim)
if label_smoothing > 0.0:
target = target * (1 - label_smoothing) + label_smoothing / n_classes
if weight is None:
weight = ones_like_(inputs)
elif inputs.ndim != 1:
broadcast_shape = [1 for _ in range(inputs.ndim)]
broadcast_shape[1] = weight.shape[0]
weight = weight.reshape(broadcast_shape)
if reduction == 'mean':
return -(inputs * target * weight).sum() / (inputs.size / n_classes)
if reduction == 'sum':
return -(inputs * target * weight).sum()
return -(inputs * target * weight).sum(class_dim)
[文档]def nll_loss(inputs, target, weight=None, ignore_index=-100, reduction='mean', label_smoothing=0.0):
r"""
Gets the negative log likelihood loss between inputs and target.
The nll loss with reduction=none can be described as:
.. math::
\ell(x, t)=L=\left\{l_{1}, \ldots, l_{N}\right\}^{\top},
\quad l_{n}=-w_{t_{n}} x_{n, t_{n}},
\quad w_{c}=\text { weight }[c] \cdot \mathbb{1}
\{c \not= \text{ignore_index}\},
where :math:`x` is the inputs, :math:`t` is the target, :math:`w` is the weight,
N is the batch size, :math:`c` belonging to :math:`[0, C-1]` is class index, where :math:`C` is the number of
classes.
If `reduction` is not ``None`` (default ``'mean'``), then
.. math::
\ell(x, t)=\left\{\begin{array}{ll}
\sum_{n=1}^{N} \frac{1}{\sum_{n=1}^{N} w_{t n}} l_{n}, & \text { if reduction }=\text { 'mean', } \\
\sum_{n=1}^{N} l_{n}, & \text { if reduction }=\text { 'sum' }
\end{array}\right.
Args:
inputs (Tensor): :math:`(N, C)` where `C = number of classes` or :math:`(N, C, H, W)`
in case of 2D Loss, or :math:`(N, C, d_1, d_2, ..., d_K)`.
`inputs` is expected to be log-probabilities, data type must be float16 or float32.
target (Tensor): :math:`(N)` or :math:`(N, d_1, d_2, ..., d_K)` for
high-dimensional loss, data type must be int32.
weight (Tensor): A rescaling weight applied to the loss of each batch element.
If not None, the shape is :math:`(C,)`.
The data type must be float16 or float32. Default: ``None`` .
ignore_index (int): Specifies a target value that is ignored
and does not contribute to the input gradient. Default: ``-100`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the weighted mean of elements in the output.
- ``'sum'``: the output elements will be summed.
label_smoothing (float): Label smoothing values, a regularization tool used to prevent the model
from overfitting when calculating Loss. The value range is [0.0, 1.0]. Default value: ``0.0`` .
Returns:
Tensor, the computed loss value.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> inputs = mindspore.Tensor(np.random.randn(3, 5), mindspore.float32)
>>> target = mindspore.Tensor(np.array([1, 0, 4]), mindspore.int32)
>>> output = ops.nll_loss(inputs, target)
"""
ndim = inputs.ndim
if ndim == 2:
ret = _nll_loss(inputs, target, -1, weight, ignore_index, reduction, label_smoothing)
elif ndim == 4:
ret = _nll_loss(inputs, target, 1, weight, ignore_index, reduction, label_smoothing)
elif ndim == 1:
ret = _nll_loss(inputs, target, 0, weight, ignore_index, reduction, label_smoothing)
else:
n = inputs.shape[0]
c = inputs.shape[1]
out_size = (n,) + inputs.shape[2:]
inputs = inputs.view((n, c, 1, -1))
target = target.view((n, 1, -1))
if reduction != 'none':
ret = _nll_loss(inputs, target, 1, weight, ignore_index, reduction, label_smoothing)
else:
ret = _nll_loss(inputs, target, 1, weight, ignore_index, label_smoothing=label_smoothing)
ret = ret.view(out_size)
return ret
def _nll_loss(inputs, target, target_dim=-1, weight=None, ignore_index=None, reduction='none', label_smoothing=0.0):
"""nll loss inner function"""
if target.ndim == inputs.ndim - 1:
target = target.expand_dims(target_dim)
if ignore_index is not None:
non_pad_mask = equal_(target, ignore_index)
target = target.masked_fill(non_pad_mask, ops.cast(0, target.dtype))
else:
non_pad_mask = target
if weight is not None:
loss_weights = gather_(weight, target, 0)
orig_shape = inputs.shape
if inputs.ndim != 2:
inputs = inputs.view(orig_shape[:2] + (-1,))
weight = weight.view(weight.shape + (1,))
weighted_inputs = inputs * weight
weighted_inputs = weighted_inputs.view(orig_shape)
loss = neg_(gather_d_(weighted_inputs, target_dim, target))
smooth_loss = neg_(weighted_inputs.sum(axis=target_dim, keepdims=True))
else:
loss = neg_(gather_d_(inputs, target_dim, target))
smooth_loss = neg_(inputs.sum(axis=target_dim, keepdims=True))
loss_weights = ones_like_(loss)
if ignore_index is not None:
loss = loss.masked_fill(non_pad_mask, ops.cast(0, loss.dtype))
loss_weights = loss_weights.masked_fill(non_pad_mask, ops.cast(0, loss_weights.dtype))
smooth_loss = smooth_loss.masked_fill(non_pad_mask, ops.cast(0, smooth_loss.dtype))
loss = loss.squeeze(target_dim)
smooth_loss = smooth_loss.squeeze(target_dim)
if reduction == 'sum':
loss = loss.sum()
smooth_loss = smooth_loss.sum()
if reduction == 'mean':
loss = loss.sum() / loss_weights.sum()
smooth_loss = smooth_loss.sum() / loss_weights.sum()
eps_i = label_smoothing / inputs.shape[target_dim]
loss = (1. - label_smoothing) * loss + eps_i * smooth_loss
return loss
[文档]def l1_loss(input, target, reduction='mean'):
r"""
Calculate the mean absolute error between the `input` value and the `target` value.
Assuming that the :math:`x` and :math:`y` (predicted and target value) are 1-D Tensor,
length :math:`N`, `reduction` is set to ``'none'``, then calculate the loss of
:math:`x` and :math:`y` without dimensionality reduction.
The formula is as follows:
.. math::
\ell(x, y) = L = \{l_1,\dots,l_N\}^\top, \quad \text{with } l_n = \left| x_n - y_n \right|,
where :math:`N` is the batch size.
If `reduction` is ``'mean'`` or ``'sum'`` , then:
.. math::
\ell(x, y) =
\begin{cases}
\operatorname{mean}(L), & \text{if reduction} = \text{'mean';}\\
\operatorname{sum}(L), & \text{if reduction} = \text{'sum'.}
\end{cases}
Args:
input (Tensor): Predicted value, Tensor of any dimension.
target (Tensor): Target value, usually has the same shape as the `input`.
If `input` and `target` have different shape, make sure they can broadcast to each other.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Scalar, if `reduction` is ``'none'``, return a Tensor with same shape and dtype as `input`.
Otherwise, a scalar value will be returned.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If `target` is not a Tensor.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'`` or ``'sum'``.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> from mindspore import Tensor, ops
>>> from mindspore import dtype as mstype
>>> x = Tensor([[1, 2, 3], [4, 5, 6]], mstype.float32)
>>> target = Tensor([[6, 5, 4], [3, 2, 1]], mstype.float32)
>>> output = ops.l1_loss(x, target, reduction="mean")
>>> print(output)
3.0
"""
_check_is_tensor('input', input, "l1_loss")
_check_is_tensor('target', target, "l1_loss")
if reduction not in ('mean', 'sum', 'none'):
raise ValueError(f"For l1_loss, the 'reduction' must be in ['mean', 'sum', 'none'], but got {reduction}.")
loss = abs_(input - target)
return _get_loss(loss, reduction, "l1_loss")
[文档]def smooth_l1_loss(input, target, beta=1.0, reduction='none'):
r"""
Computes smooth L1 loss, a robust L1 loss.
SmoothL1Loss is a Loss similar to MSELoss but less sensitive to outliers as described in the
`Fast R-CNN <https://arxiv.org/abs/1504.08083>`_ by Ross Girshick.
Given two input :math:`x,\ y` of length :math:`N`, the unreduced SmoothL1Loss can be described
as follows:
.. math::
L_{i} =
\begin{cases}
\frac{0.5 (x_i - y_i)^{2}}{\beta}, & \text{if } |x_i - y_i| < \beta \\
|x_i - y_i| - 0.5 * \beta, & \text{otherwise. }
\end{cases}
If `reduction` is not `none`, then:
.. math::
L =
\begin{cases}
\operatorname{mean}(L_{i}), & \text{if reduction} = \text{'mean';}\\
\operatorname{sum}(L_{i}), & \text{if reduction} = \text{'sum'.}
\end{cases}
Here :math:`\text{beta}` controls the point where the loss function changes from quadratic to linear.
:math:`\text{beta}>0` , its default value is ``1.0`` . :math:`N` is the batch size.
Args:
input (Tensor): Tensor of shape :math:`(N, *)` where :math:`*` means, any number of additional dimensions.
Data type is float16, float32 or float64.
target (Tensor): Ground truth data, tensor of shape :math:`(N, *)`, same shape and dtype as the `input`.
beta (float): A parameter used to control the point where the function will change between
L1 to L2 loss. The value should be greater than zero. Default: ``1.0`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'none'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor, if `reduction` is ``'none'``, then output is a tensor with the same shape as `input`.
Otherwise, the shape of output tensor is :math:`(1,)`.
Raises:
TypeError: If `beta` is not a float.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'``, ``'sum'``.
TypeError: If dtype of `input` or `target` is not one of float16, float32, float64.
ValueError: If `beta` is less than or equal to 0.
ValueError: If shape of `input` is not the same as `target`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> logits = Tensor(np.array([1, 2, 3]), mindspore.float32)
>>> labels = Tensor(np.array([1, 2, 2]), mindspore.float32)
>>> output = ops.smooth_l1_loss(logits, labels)
>>> print(output)
[0. 0. 0.5]
"""
_smooth_l1_loss = _get_cache_prim(P.SmoothL1Loss)(beta, reduction)
return _smooth_l1_loss(input, target)
[文档]def threshold(input, thr, value):
r"""
Returns each element of `input` after thresholding by `thr` as a Tensor.
The formula is defined as follows:
.. math::
y =
\begin{cases}
input, &\text{ if } input > \text{thr} \\
\text{value}, &\text{ otherwise }
\end{cases}
Args:
input (Tensor): The input of threshold with data type of float16 or float32.
thr (Union[int, float]): The value of the threshold.
value (Union[int, float]): The value to replace with when element is less than threshold.
Returns:
Tensor, the same shape and data type as the input.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If `thr` is not a float or an int.
TypeError: If `value` is not a float or an int.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> inputs = mindspore.Tensor([0.0, 2, 3], mindspore.float32)
>>> outputs = ops.threshold(inputs, 1, 100)
>>> print(outputs)
[100. 2. 3.]
"""
_check_is_tensor('input', input, "threshold")
_check_value_type("thr", thr, [float, int], "threshold")
_check_value_type("value", value, [float, int], "threshold")
cond = greater_(input, thr)
input_type = input.dtype
value = Tensor(value, input_type)
input_shape = input.shape
shape_tensor = tuple_to_tensor_(input_shape, mstype.int64)
value = fillv2_(shape_tensor, value)
return select_(cond, input, value)
[文档]def leaky_relu(input, alpha=0.2):
r"""
leaky_relu activation function. The element of `input` less than 0 times `alpha` .
The activation function is defined as:
.. math::
\text{leaky_relu}(input) = \begin{cases}input, &\text{if } input \geq 0; \cr
{\alpha} * input, &\text{otherwise.}\end{cases}
where :math:`\alpha` represents the `alpha` parameter.
For more details, see `Rectifier Nonlinearities Improve Neural Network Acoustic Models
<https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`_.
LeakyReLU Activation Function Graph:
.. image:: ../images/LeakyReLU.png
:align: center
Args:
input (Tensor): The input of leaky_relu is a Tensor of any dimension.
alpha (Union[int, float]): Slope of the activation function when the element of `input` is less than 0.
Default: ``0.2`` .
Returns:
Tensor, has the same type and shape as the `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If `alpha` is not a float or an int.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([[-1.0, 4.0, -8.0], [2.0, -5.0, 9.0]]), mindspore.float32)
>>> print(ops.leaky_relu(x, alpha=0.2))
[[-0.2 4. -1.6]
[ 2. -1. 9. ]]
"""
_check_is_tensor('input', input, "leaky_relu")
_check_value_type("alpha", alpha, [float, int], "leaky_relu")
select_op = maximum_
if alpha > 1:
select_op = minimum_
alpha = cast_(F.scalar_to_tensor(alpha), input.dtype)
return select_op(alpha * input, input)
[文档]def intopk(x1, x2, k):
r"""
Determines whether the targets are in the top `k` predictions.
Args:
x1 (Tensor): A 2D Tensor defines the predictions of a batch of samples with float16 or float32
data type.
x2 (Tensor): A 1D Tensor defines the labels of a batch of samples with int32 data type. The size of `x2`
must be equal to the first dimension of `x1`. The values of `x2` can not be negative and
must be equal to or less than index of x1's second dimension.
k (int): Specifies the number of top elements to be used for computing precision along the last dimension.
Returns:
Tensor has 1 dimension of type bool and the same shape with `x2`. For labeling sample `i` in `x2`,
if the label in the first `k` predictions for sample `i` is in `x1`, then the value is True, otherwise False.
Raises:
TypeError: If `k` is not an int.
TypeError: If `x1` or `x2` is not a Tensor.
TypeError: If dtype of `x1` is neither float16 nor float32.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x1 = Tensor(np.array([[1, 8, 5, 2, 7], [4, 9, 1, 3, 5]]), mindspore.float32)
>>> x2 = Tensor(np.array([1, 3]), mindspore.int32)
>>> output = ops.intopk(x1, x2, 3)
>>> print(output)
[ True False]
"""
_in_topk = _get_cache_prim(P.InTopK)(k)
return _in_topk(x1, x2)
[文档]def lrn(x, depth_radius=5, bias=1.0, alpha=1.0, beta=0.5, norm_region="ACROSS_CHANNELS"):
r"""
Local Response Normalization.
.. warning::
lrn is deprecated on Ascend due to potential accuracy problem. It's recommended to use other
normalization methods, e.g. :class:`mindspore.ops.batch_norm`.
.. math::
b_{c} = a_{c}\left(k + \frac{\alpha}{n}
\sum_{c'=\max(0, c-n/2)}^{\min(N-1,c+n/2)}a_{c'}^2\right)^{-\beta}
where the :math:`a_{c}` indicates the specific value of the pixel corresponding to :math:`c` in feature map;
where the :math:`n/2` indicates the `depth_radius`; where the :math:`k` indicates the `bias`;
where the :math:`\alpha` indicates the `alpha`; where the :math:`\beta` indicates the `beta`.
Args:
depth_radius (int): Half-width of the 1-D normalization window with the shape of 0-D. Default: ``5`` .
bias (float): An offset (usually positive to avoid dividing by 0). Default: ``1.0`` .
alpha (float): A scale factor, usually positive. Default: ``1.0`` .
beta (float): An exponent. Default: ``0.5`` .
norm_region (str): Specifies normalization region. Options: ``"ACROSS_CHANNELS"`` .
Default: ``"ACROSS_CHANNELS"`` .
x (Tensor): A 4-D Tensor with float16 or float32 data type.
Returns:
Tensor, with the same shape and data type as `x`.
Raises:
TypeError: If `depth_radius` is not an int.
TypeError: If `bias`, `alpha` or `beta` is not a float.
TypeError: If `norm_region` is not a str.
TypeError: If `x` is not a Tensor.
Supported Platforms:
``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.array([[[[0.1], [0.2]],
... [[0.3], [0.4]]]]), mindspore.float32)
>>> output = ops.lrn(input_x)
>>> print(output)
[[[[0.09534626]
[0.1825742 ]]
[[0.2860388 ]
[0.3651484 ]]]]
"""
lrn_op = NN_OPS.LRN(depth_radius, bias, alpha, beta, norm_region)
return lrn_op(x)
[文档]def mish(x):
r"""
Computes MISH(A Self Regularized Non-Monotonic Neural Activation Function) of input tensors element-wise.
The function is shown as follows:
.. math::
\text{output} = x * \tanh(\log(1 + \exp(\text{x})))
See more details in `A Self Regularized Non-Monotonic Neural Activation Function
<https://arxiv.org/abs/1908.08681>`_.
Mish Activation Function Graph:
.. image:: ../images/Mish.png
:align: center
Args:
x (Tensor): The input Tensor.
Supported dtypes:
- GPU/CPU: float16, float32, float64.
- Ascend: float16, float32.
Returns:
Tensor, with the same type and shape as the `x`.
Raises:
TypeError: If dtype of `x` is not float16, float32 or float64.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.array([[-1.0, 4.0, -8.0], [2.0, -5.0, 9.0]]), mindspore.float32)
>>> output = ops.mish(input_x)
>>> print(output)
[[-3.0340147e-01 3.9974129e+00 -2.68311895e-03]
[ 1.9439590e+00 -3.3576239e-02 8.99999990e+00]]
>>> input_x = Tensor(2.1, mindspore.float32)
>>> output = ops.mish(input_x)
>>> print(output)
2.050599
"""
return mish_(x)
@_primexpr
def _check_value_type(arg_name, arg_value, valid_types, prim_name=None):
"""Checks whether a value is instance of some types."""
return validator.check_value_type(arg_name, arg_value, valid_types, prim_name)
@constexpr(check=False)
def _check_is_tensor(param_name, input_data, cls_name):
"""Internal function, used to check whether the input data is Tensor."""
if input_data is not None and not isinstance(ops.typeof(input_data), mstype.TensorType):
raise TypeError(f"For '{cls_name}', the '{param_name}' must be a Tensor, "
f"but got '{ops.typeof(input_data)}'")
@constexpr
def _check_number_gt_value(arg_name, arg_value, value, cls_name):
"""Internal function, used to judge whether arg_value is greater than or equal to value."""
return validator.check_number(arg_name, arg_value, value, validator.GT, cls_name)
def _get_axis(x):
"""Get a range of axis for input."""
shape = ops.shape(x)
length = ops.tuple_len(shape)
perm = ops.make_range(0, length)
return perm
def _get_loss(x, reduction, cls_name, weights=1.0):
"""Calculate the loss with reduction and weights."""
if reduction not in ('mean', 'sum', 'none'):
raise ValueError(f"For '{cls_name}', the 'reduction' must be in ['mean', 'sum', 'none'], "
f"but got {reduction}.")
input_dtype = x.dtype
x = cast_(x, mstype.float32)
weights = cast_(weights, mstype.float32)
x = mul_(weights, x)
if reduction == 'mean':
x = reduce_mean_(x, _get_axis(x))
if reduction == 'sum':
x = reduce_sum_(x, _get_axis(x))
x = cast_(x, input_dtype)
return x
def check_input_dtype(param_name1, input_data1, param_name2, input_data2, cls_name):
"""Check the type of input1 and input2."""
if input_data1.dtype != input_data2.dtype:
raise TypeError(f'For {cls_name}, the {param_name1} dtype should be equal to {param_name2} dtype, '
f'but got {param_name1} dtype:{input_data1.dtype}, {param_name2} dtype:{input_data2.dtype}.')
[文档]def margin_ranking_loss(input1, input2, target, margin=0.0, reduction='mean'):
r"""
MarginRankingLoss creates a criterion that measures the loss.
Given two tensors :math:`input1`, :math:`input2` and a Tensor label :math:`target` with values 1 or -1,
the operation is as follows:
.. math::
\text{loss}(input1, input2, target) = \max(0, -target * (input1 - input2) + \text{margin})
Args:
input1 (Tensor): Tensor of shape :math:`(N, *)` where :math:`*` means, any number of additional dimensions.
input2 (Tensor): Tensor of shape :math:`(N, *)`, same shape and dtype as `input1`.
target (Tensor): Contains value 1 or -1. Suppose the shape of `input1` is
:math:`(x_1, x_2, x_3, ..., x_R)`, then the shape of `target` must be :math:`(x_1, x_2, x_3, ..., x_R)`.
margin (float, optional): Specify the adjustment factor of the operation. Default: ``0.0`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Scalar. if `reduction` is ``'none'``, its shape is the same as `input1`.
Otherwise, a scalar value will be returned.
Raises:
TypeError: If `margin` is not a float.
TypeError: If `input1`, `input2` or `target` is not a Tensor.
TypeError: If the types of `input1` and `input2` are inconsistent.
TypeError: If the types of `input1` and `target` are inconsistent.
ValueError: If the shape of `input1` and `input2` are inconsistent.
ValueError: If the shape of `input1` and `target` are inconsistent.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'`` , ``'sum'``.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import Tensor, ops
>>> import numpy as np
>>> input1 = Tensor(np.array([0.3864, -2.4093, -1.4076]), ms.float32)
>>> input2 = Tensor(np.array([-0.6012, -1.6681, 1.2928]), ms.float32)
>>> target = ops.Sign()(Tensor(np.array([-2, -2, 3]), ms.float32))
>>> output = ops.margin_ranking_loss(input1, input2, target)
>>> print(output)
1.2293333
"""
margin = _check_value_type("margin", margin, [float], "margin_ranking_loss")
_check_is_tensor('input1', input1, "margin_ranking_loss")
_check_is_tensor('input2', input2, "margin_ranking_loss")
_check_is_tensor('target', target, "margin_ranking_loss")
check_input_dtype('input1', input1, 'input2', input2, 'margin_ranking_loss')
check_input_dtype('target', target, 'input1', input1, 'margin_ranking_loss')
x = maximum_(-target * (input1 - input2) + margin, 0)
return _get_loss(x, reduction, "margin_ranking_loss")
@_primexpr
def _check_reduced_shape_valid(ori_shape, reduced_shape, axis, cls_name, arg_name1, arg_name2):
"""Internal function, used to check whether the reduced shape meets the requirements."""
validator.check_reduce_shape(ori_shape, reduced_shape, axis, cls_name, arg_name1, arg_name2)
[文档]def cosine_embedding_loss(input1, input2, target, margin=0.0, reduction="mean"):
r"""
CosineEmbeddingLoss creates a criterion to measure the similarity between two tensors using cosine distance.
Given two tensors :math:`input1`, :math:`input2`, and a Tensor label :math:`target` with values 1 or -1:
.. math::
loss(input1, input2, target) = \begin{cases}
1-cos(input1, input2), & \text{if } target = 1\\
max(0, cos(input1, input2)-margin), & \text{if } target = -1\\
\end{cases}
Args:
input1 (Tensor): Tensor of shape :math:`(N, *)` where :math:`*` means, any number
of additional dimensions.
input2 (Tensor): Tensor of shape :math:`(N, *)`, same shape and dtype as `input1`.
target (Tensor): Contains value 1 or -1. Suppose the shape of `input1` is
:math:`(x_1, x_2, x_3, ..., x_R)`, then the shape of `target` must be :math:`(x_1, x_3, x_4, ..., x_R)`.
margin (float, optional): Should be in [-1.0, 1.0]. Default: ``0.0``.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Scalar, if `reduction` is ``"none"``, its shape is the same as `target`.
Otherwise, a scalar value will be returned.
Raises:
TypeError: If `margin` is not a float.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'``, ``'sum'``.
ValueError: If `margin` is not in range [-1.0, 1.0].
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> intput1 = Tensor(np.array([[0.3, 0.8], [0.4, 0.3]]), mindspore.float32)
>>> intput2 = Tensor(np.array([[0.4, 1.2], [-0.4, -0.9]]), mindspore.float32)
>>> target = Tensor(np.array([1, -1]), mindspore.int32)
>>> output = ops.cosine_embedding_loss(intput1, intput2, target)
>>> print(output)
0.0003425479
"""
_check_is_tensor('input1', input1, "ops.cosine_embedding_loss")
_check_is_tensor('input2', input2, "ops.cosine_embedding_loss")
_check_is_tensor('target', target, "ops.cosine_embedding_loss")
check_input_dtype('input1', input1, 'input2', input2, 'ops.cosine_embedding_loss')
_check_reduced_shape_valid(ops.shape(input1), ops.shape(target), (1,),
"ops.cosine_embedding_loss", "input1", "target")
if input1.dtype in (mstype.int32, mstype.int64):
input1 = input1.astype(mstype.float32)
if input2.dtype in (mstype.int32, mstype.int64):
input2 = input2.astype(mstype.float32)
margin_f = float(margin) if isinstance(margin, int) else margin
_check_value_type("margin", margin_f, [float], "ops.cosine_embedding_loss")
if not isinstance(margin_f, float):
raise TypeError(f"For ops.cosine_embedding_loss, 'margin' must be float, but got {type(margin_f)}")
if margin_f > 1.0 or margin_f < -1.0:
raise ValueError(f"For ops.cosine_embedding_loss, the value of 'margin' should be in [-1, 1],"
f"but got {margin_f}.")
prod_sum = reduce_sum_(input1 * input2, (1,))
square1 = reduce_sum_(ops.square(input1), (1,))
square2 = reduce_sum_(ops.square(input2), (1,))
denom = ops.sqrt(square1) * ops.sqrt(square2)
cosine = prod_sum / denom
pos_value = 1.0 - cosine
neg_value = maximum_(cosine - margin_f, 0.0)
zeros = ops.zeros_like(cosine)
pos_part = ops.select(target == 1, pos_value, zeros)
neg_part = ops.select(target == -1, neg_value, zeros)
output_unreduced = pos_part + neg_part
return _get_loss(output_unreduced, reduction, "cosine_embedding_loss")
[文档]def max_pool3d(x, kernel_size, stride=None, padding=0, dilation=1, ceil_mode=False, return_indices=False):
r"""
Performs a 3D max pooling on the input Tensor.
Typically the input is a Tensor with shape :math:`(N_{in}, C_{in}, D_{in}, H_{in}, W_{in})`, outputs
regional maximum in the :math:`(D_{in}, H_{in}, W_{in})`-dimension. Given `kernel_size`
:math:`ks = (d_{ker}, h_{ker}, w_{ker})` and `stride` :math:`s = (s_0, s_1, s_2)`, the operation is as follows:
.. math::
\text{output}(N_i, C_j, d, h, w) =
\max_{l=0, \ldots, d_{ker}-1} \max_{m=0, \ldots, h_{ker}-1} \max_{n=0, \ldots, w_{ker}-1}
\text{input}(N_i, C_j, s_0 \times d + l, s_1 \times h + m, s_2 \times w + n)
Args:
x (Tensor): Tensor of shape :math:`(N_{in}, C_{in}, D_{in}, H_{in}, W_{in})` with data type of int8,
int16, int32, int64, uint8, uint16, uint32, uint64, float16, float32 or float64.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value and arg
value, is an int number that represents depth, height and width of the kernel, or a tuple of
three int numbers that represent depth, height and width respectively.
stride (Union[int, tuple[int]]): The distance of kernel moving, an int number that represents
the depth, height and width of movement are both stride, or a tuple of three int numbers that
represent depth, height and width of movement respectively.
Default: ``None`` , which indicates the moving step is `kernel_size` .
padding (Union[int, tuple[int]]): An int number that represents the depth, height and width of movement are both
strides, or a tuple of three int numbers that represent depth, height and width of movement respectively.
Default: ``0`` .
dilation (Union[int, tuple[int]]): Control the stride of elements in the kernel. Default: ``1`` .
ceil_mode (bool): Whether to use ceil instead of floor to calculate output shape. Default: ``False`` .
return_indices (bool): Whether to output the indices of max value. Default: ``False`` .
Returns:
If `return_indices` is False, return a Tensor `output`, else return a tuple (`output`, `argmax`).
- **output** (Tensor) - Maxpooling result, with shape :math:`(N_{out}, C_{out}, D_{out}, H_{out}, W_{out})`.
It has the same data type as `x`.
.. math::
D_{out} = \left\lfloor\frac{D_{in} + 2 \times \text{padding}[0] - \text{dilation}[0] \times
(\text{kernel_size}[0] - 1) - 1}{\text{stride}[0]} + 1\right\rfloor
.. math::
H_{out} = \left\lfloor\frac{H_{in} + 2 \times \text{padding}[1] - \text{dilation}[1] \times
(\text{kernel_size}[1] - 1) - 1}{\text{stride}[1]} + 1\right\rfloor
.. math::
W_{out} = \left\lfloor\frac{W_{in} + 2 \times \text{padding}[2] - \text{dilation}[2] \times
(\text{kernel_size}[2] - 1) - 1}{\text{stride}[2]} + 1\right\rfloor
- **argmax** (Tensor) - Index corresponding to the maximum value. Data type is int64. It will be returned
only when `return_indices` is ``True`` .
Raises:
TypeError: If `x` is not a Tensor.
ValueError: If length of shape of `x` is not equal to 5.
TypeError: If `kernel_size` , `stride` , `padding` or `dilation` is not int or tuple.
ValueError: If `kernel_size` or `stride` is less than 1.
ValueError: If `padding` is less than 0.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.arange(2 * 1 * 2 * 2 * 2).reshape((2, 1, 2, 2, 2)), mindspore.float32)
>>> output_tensor, argmax = ops.max_pool3d(x, kernel_size=2, stride=1, padding=1, return_indices=True)
>>> print(output_tensor.shape)
(2, 1, 3, 3, 3)
>>> print(argmax.shape)
(2, 1, 3, 3, 3)
"""
strides = stride if (stride is not None) else kernel_size
max_pool3d_with_argmax_ = _get_cache_prim(NN_OPS.MaxPool3DWithArgmax)(
kernel_size, strides, padding, dilation, ceil_mode)
out, indices = max_pool3d_with_argmax_(x)
if return_indices:
return out, indices
return out
[文档]def grid_sample(input, grid, mode='bilinear', padding_mode='zeros', align_corners=False):
"""
Given an `input` and a flow-field `grid`, computes the `output` using `input` values and pixel locations from
`grid`. Only spatial (4-D) and volumetric (5-D) `input` is supported.
In the spatial (4-D) case, for `input` with shape :math:`(N, C, H_{in}, W_{in})` and `grid` with shape
:math:`(N, H_{out}, W_{out}, 2)`, the `output` will have shape :math:`(N, C, H_{out}, W_{out})`.
For each output location `output[n, :, h, w]`, the size-2 vector `grid[n, h, w]` specifies `input` pixel
locations `x` and `y`, which are used to interpolate the output value `output[n, :, h, w]`. In the case of 5D
inputs, `grid[n, d, h, w]`, specifies the `x`, `y`, `z` pixel locations for interpolating
`output[n, :, d, h, w]`. And `mode` argument specifies "nearest" or "bilinear" ("bicubic" is not supported yet)
interpolation method to sample the input pixels.
`grid` specifies the sampling pixel locations normalized by the `input` spatial dimensions. Therefore, it should
have most values in the range of :math:`[-1, 1]`.
If `grid` has values outside the range of :math:`[-1, 1]`, the corresponding outputs are handled as defined by
`padding_mode`. If `padding_mode` is set to be "zeros", use :math:`0` for out-of-bound grid locations. If
`padding_mode` is set to be "border", use border values for out-of-bound grid locations. If `padding_mode` is set
to be "reflection", use values at locations reflected by the border for out-of-bound grid locations. For location
far away from the border, it will keep being reflected until becoming in bound.
Args:
input (Tensor): input with shape of :math:`(N, C, H_{in}, W_{in})` (4-D case) or :math:`(N, C, D_{in},
H_{in}, W_{in})` (5-D case) and dtype of float32 or float64.
grid (Tensor): flow-field with shape of :math:`(N, H_{out}, W_{out}, 2)` (4-D case) or :math:`(N, D_{out},
H_{out}, W_{out}, 3)` (5-D case) and same dtype as `input`.
mode (str): An optional string specifying the interpolation method. The optional values are
``'bilinear'``, ``'nearest'``. Default: ``'bilinear'`` . Note: `bicubic` is not supported yet. When
`mode="bilinear"` and the input is 5-D, the interpolation mode used internally will actually
be trilinear. However, when the input is 4-D, the interpolation mode will legistimately be bilinear.
Default: ``'bilinear'`` .
- ``'nearest'``: Nearest neighbor interpolation. Each output pixel is assigned the value of the
nearest input pixel. This method is simple and fast but can result in blocky or pixelated outputs.
- ``'bilinear'``: Bilinear interpolation. Each output pixel is a weighted average of the four nearest input
pixels, computed using bilinear interpolation. This method produces smoother results compared
to nearest neighbor interpolation.
- ``'trilinear'``: Trilinear interpolation. This is an extension of bilinear interpolation to 3D data.
It performs bilinear interpolation in the two spatial dimensions and linear interpolation along
the third dimension. It is commonly used for volume or 3D image interpolation.
padding_mode (str): An optional string specifying the pad method. The optional values are "zeros", "border" or
"reflection". Default: ``'zeros'`` .
align_corners (bool): If set to `True`, the extrema (-1 and 1) are considered as referring to
the center points of the input's corner pixels. If set to `False`, they are instead considered as referring
to the corner points of the input's corner pixels, making the sampling more resolution agnostic. Default:
``False`` .
Returns:
Tensor, dtype is the same as `input` and whose shape is :math:`(N, C, H_{out}, W_{out})` (4-D) and
:math:`(N, C, D_{out}, H_{out}, W_{out})` (5-D).
Raises:
TypeError: If `input` or `grid` is not a Tensor.
TypeError: If the dtypes of `input` and `grid` are inconsistent.
TypeError: If the dtype of `input` or `grid` is not a valid type.
TypeError: If `align_corners` is not a boolean value.
ValueError: If the rank of `input` or `grid` is not equal to 4(4-D case) or 5(5-D case).
ValueError: If the first dimension of `input` is not equal to that of `grid`.
ValueError: If the last dimension of `grid` is not equal to 2(4-D case) or 3(5-D case).
ValueError: If `mode` is not "bilinear", "nearest" or a string value.
ValueError: If `padding_mode` is not "zeros", "border", "reflection" or a string value.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.arange(16).reshape((2, 2, 2, 2)).astype(np.float32))
>>> grid = Tensor(np.arange(0.2, 1, 0.1).reshape((2, 2, 1, 2)).astype(np.float32))
>>> output = ops.grid_sample(input_x, grid, mode='bilinear', padding_mode='zeros',
... align_corners=True)
>>> print(output)
[[[[ 1.9 ]
[ 2.1999998]]
[[ 5.9 ]
[ 6.2 ]]]
[[[10.5 ]
[10.8 ]]
[[14.5 ]
[14.8 ]]]]
"""
if input.ndim == 4:
_grid_sampler_2d = _get_cache_prim(NN_OPS.GridSampler2D)(mode, padding_mode, align_corners)
return _grid_sampler_2d(input, grid)
_grid_sampler_3d = _get_cache_prim(NN_OPS.GridSampler3D)(mode, padding_mode, align_corners)
return _grid_sampler_3d(input, grid)
@constexpr
def _check_ctc_loss_inputs(blank, reduction, zero_infinity, prim_name):
validator.check_value_type("blank", blank, [int], prim_name)
validator.check_value_type('reduction', reduction, [str], prim_name)
validator.check_string(reduction, ['none', 'sum', 'mean'], 'reduction', prim_name)
validator.check_value_type("zero_infinity", zero_infinity, [bool], prim_name)
[文档]def ctc_loss(log_probs, targets, input_lengths, target_lengths, blank=0, reduction="mean", zero_infinity=False):
"""
Calculates the CTC (Connectionist Temporal Classification) loss and the gradient.
CTC is a loss function in sequence labeling problems, which is mainly used to deal with the alignment of input
and output labels in sequence labeling problems.
While traditional sequence labeling algorithms require the input and output symbols to be perfectly aligned at
each moment, CTC expands the label collection and adds empty elements.
After labeling the sequence using the extended label set, all the prediction sequences that can be converted
into real sequences by the mapping function are correct prediction results, that is, the predicted sequence
can be obtained without data alignment processing.
Its objective function is to maximize the sum of probabilities of all correct prediction sequences.
The CTC algorithm is proposed in `Connectionist Temporal Classification: Labeling Unsegmented Sequence Data with
Recurrent Neural Networks <http://www.cs.toronto.edu/~graves/icml_2006.pdf>`_.
Args:
log_probs (Tensor): A tensor of shape :math:`(T, N, C)`, where T is input length, N is batch size and C is
number of classes (including blank).
targets (Tensor): Target sequences. A tensor of shape :math:`(N, S)`, where S is max target length.
input_lengths (Union(tuple, Tensor)): Lengths of the input. A tuple or Tensor of shape :math:`(N)`.
target_lengths (Union(tuple, Tensor)): Lengths of the target. A tuple or Tensor of shape :math:`(N)`.
blank (int, optional): The blank label. Default: ``0`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
zero_infinity (bool, optional): Whether to set infinite loss and correlation gradient to 0. Default: ``False`` .
Returns:
neg_log_likelihood (Tensor), A loss value with shape :math:`(N)` , which is differentiable with respect to
each input node.
log_alpha (Tensor), The probability of possible trace of input to target with shape :math:`(N, T, 2 * S + 1)` .
Raises:
TypeError: If `zero_infinity` is not a bool, `reduction` is not string.
TypeError: If the dtype of `log_probs` is not float or double.
TypeError: If the dtype of `targets`, `input_lengths` or `target_lengths` is not int32 or int64.
ValueError: If the rank of `log_probs` is not 3.
ValueError: If the rank of `targets` is not 2.
ValueError: If the shape of `input_lengths` does not match N. N is batch size of `log_probs` .
ValueError: If the shape of `target_lengths` does not match N. N is batch size of `log_probs` .
ValueError: If the value of `blank` is not in range [0, num_labels|C). C is number of classes of `log_probs` .
RuntimeError: If any value of `input_lengths` is larger than T. T is the length of `log_probs`.
RuntimeError: If any target_lengths[i] is not in range [0, input_length[i]].
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> from mindspore import dtype as mstype
>>> log_probs = Tensor(np.array([[[0.3, 0.6, 0.6]],
... [[0.9, 0.4, 0.2]]]).astype(np.float32))
>>> targets = Tensor(np.array([[0, 1]]), mstype.int32)
>>> input_lengths = Tensor(np.array([2]), mstype.int32)
>>> target_lengths = Tensor(np.array([1]), mstype.int32)
>>> loss, log_alpha = ops.ctc_loss(log_probs, targets, input_lengths,
... target_lengths, 0, 'mean', True)
>>> print(loss)
-2.2986124
>>> print(log_alpha)
[[[0.3 0.3 -inf -inf -inf]
[1.2 1.8931472 1.2 -inf -inf]]]
"""
_check_ctc_loss_inputs(blank, reduction, zero_infinity, 'ctc_loss')
ctc_loss_op = NN_OPS.CTCLossV2(blank=blank, reduction="none", zero_infinity=zero_infinity)
loss, log_alpha = ctc_loss_op(log_probs, targets, input_lengths, target_lengths)
if reduction == 'sum':
loss = loss.sum()
if reduction == 'mean':
input_type = loss.dtype
target_length_t = target_lengths.clip(1., None)
loss = loss.astype("float32")
loss = loss / target_length_t
loss = loss.mean()
loss = loss.astype(input_type)
return (loss, log_alpha)
[文档]def gaussian_nll_loss(x, target, var, full=False, eps=1e-6, reduction='mean'):
r"""
Gaussian negative log likelihood loss.
The target values are considered to be samples from a Gaussian distribution, where the expectation and variance are
predicted by a neural network. For `labels` modeled on a Gaussian distribution, `logits` to record expectations,
and the variance `var` (elements are all positive), the calculated loss is:
.. math::
\text{loss} = \frac{1}{2}\left(\log\left(\text{max}\left(\text{var},
\ \text{eps}\right)\right) + \frac{\left(\text{x} - \text{target}\right)^2}
{\text{max}\left(\text{var}, \ \text{eps}\right)}\right) + \text{const.}
where :math:`eps` is used for stability of :math:`log`. When :math:`full=True`, a constant will be added to the
loss. If the shape of :math:`var` and :math:`logits` are not the same (due to a homoscedastic assumption),
their shapes must allow correct broadcasting.
Args:
x (Tensor): Tensor of shape :math:`(N, *)` or :math:`(*)` where :math:`*` means any number of
additional dimensions.
target (Tensor): Tensor of shape :math:`(N, *)` or :math:`(*)`, same shape as the x, or same shape
as the x but with one dimension equal to 1 (to allow broadcasting).
var (Tensor): Tensor of shape :math:`(N, *)` or :math:`(*)`, same shape as x, or same shape as the x
but with one dimension equal to 1, or same shape as the x but with one fewer dimension
(to allow for broadcasting).
full (bool, optional): Include the constant term in the loss calculation. When :math:`full=True`,
the constant term will be :math:`const = 0.5*log(2\pi)`. Default: ``False``.
eps (float, optional): Used to improve the stability of log function must be greater than 0. Default: ``1e-6`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Tensor scalar, the computed loss depending on :math:`reduction`.
Raises:
TypeError: If `x`, `target` or `var` is not a Tensor.
TypeError: If `full` is not a bool.
TypeError: If `eps` is not a float.
ValueError: If `eps` is not a float within (0, inf).
ValueError: If `reduction` is not one of ``"none"`` , ``"mean"`` , ``"sum"`` .
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> import mindspore.common.dtype as mstype
>>> arr1 = np.arange(8).reshape((4, 2))
>>> arr2 = np.array([2, 3, 1, 4, 6, 4, 4, 9]).reshape((4, 2))
>>> x = Tensor(arr1, mstype.float32)
>>> var = Tensor(np.ones((4, 1)), mstype.float32)
>>> target = Tensor(arr2, mstype.float32)
>>> output = ops.gaussian_nll_loss(x, target, var)
>>> print(output)
1.4374993
Reference:
Nix, D. A. and Weigend, A. S., "Estimating the mean and variance of the
target probability distribution", Proceedings of 1994 IEEE International
Conference on Neural Networks (ICNN'94), Orlando, FL, USA, 1994, pp. 55-60
vol.1, doi: 10.1109/ICNN.1994.374138.
"""
if not isinstance(x, Tensor):
raise TypeError(f"For 'gaussian_nll_loss', 'x' must be a tensor, but got {type(x)}.")
if not isinstance(target, Tensor):
raise TypeError(f"For 'gaussian_nll_loss', 'target' must be a tensor, but got {type(target)}.")
if not isinstance(var, Tensor):
raise TypeError(f"For 'gaussian_nll_loss', 'var' must be a tensor, but got {type(var)}.")
if not isinstance(full, bool):
raise TypeError(f"For 'gaussian_nll_loss', 'full' must be a bool, but got {type(full)}.")
if not isinstance(eps, float) or eps <= 0:
raise ValueError(f"For 'gaussian_nll_loss', 'eps' must be a positive float, but got {eps}.")
if reduction not in ('none', 'mean', 'sum'):
raise ValueError(f"For 'gaussian_nll_loss', 'reduction' must be one of 'none', 'mean', or 'sum',\
but got {reduction}.")
if not x.shape == var.shape:
if x.shape[:-1] == var.shape:
var = var.unsqueeze(dim=-1)
maxima = maximum_(var, eps)
logarithm = log_(maxima)
squared_loss = square_(x - target)
c = 0 if not full else 0.5 * log(2 * pi)
loss = 0.5 * (logarithm + squared_loss / maxima) + c
if reduction == 'mean':
loss = loss.mean()
elif reduction == 'sum':
loss = loss.sum()
return loss
@_primexpr
def _check_hinge_embedding_loss_type(inputs_dtype, targets_dtype, inputs, targets, margin, reduction):
"""Check hinge embedding loss type."""
if not isinstance(margin, (float, int)):
raise TypeError(f"For 'HingeEmbeddingLoss', 'margin' must be a float or int, but got {type(margin)}.")
if reduction not in ['none', 'mean', 'sum']:
raise ValueError(f"For 'HingeEmbeddingLoss', 'reduction' must be one of 'none', 'mean', 'sum',"
f"but got {reduction}.")
if not isinstance(inputs, Tensor):
raise TypeError(f"For 'HingeEmbeddingLoss', the first input must be a Tensor, but got {type(inputs)}.")
if not isinstance(targets, Tensor):
raise TypeError(f"For 'HingeEmbeddingLoss', the second input must be a Tensor, but got {type(targets)}.")
if inputs_dtype not in mstype.float_type:
raise TypeError(f"For 'HingeEmbeddingLoss', the dtype of the first input must be float, but got "
f"{inputs_dtype}.")
if targets_dtype not in mstype.float_type:
raise TypeError(f"For 'HingeEmbeddingLoss', the dtype of the second input must be float, but got "
f"{targets_dtype}.")
[文档]def hinge_embedding_loss(inputs, targets, margin=1.0, reduction='mean'):
r"""
Measures Hinge Embedding Loss given an input Tensor `intputs` and a labels Tensor `targets` (containing 1 or -1).
The loss function for :math:`n`-th sample in the mini-batch is
.. math::
l_n = \begin{cases}
x_n, & \text{if}\; y_n = 1,\\
\max \{0, \Delta - x_n\}, & \text{if}\; y_n = -1,
\end{cases}
and the total loss functions is
.. math::
\ell(x, y) = \begin{cases}
\operatorname{mean}(L), & \text{if reduction} = \text{'mean';}\\
\operatorname{sum}(L), & \text{if reduction} = \text{'sum'.}
\end{cases}
where :math:`L = \{l_1,\dots,l_N\}^\top`.
Args:
inputs (Tensor): Predicted values, represented as :math:`x` in the formula.
targets (Tensor): Label values, represented as :math:`y` in the formula.
Has the same shape as `inputs`, contains -1 or 1.
margin (float, int): Threshold defined by Hinge Embedding Loss `margin`.
Represented as :math:`\Delta` in the formula. Default: ``1.0`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Tensor scalar, the computed loss depending on `reduction`.
Raises:
TypeError: If `inputs` is not a Tensor.
TypeError: If `targets` is not a Tensor.
TypeError: If `margin` is not a float or int.
ValueError: If `targets` does not have the same shape as `inputs` or they could not broadcast to each other.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'``, ``'sum'``.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import numpy as np
>>> import mindspore.common.dtype as mstype
>>> from mindspore import ops
>>> from mindspore import Tensor
>>> arr1 = np.array([0.9, -1.2, 2, 0.8, 3.9, 2, 1, 0, -1]).reshape((3, 3))
>>> arr2 = np.array([1, 1, -1, 1, -1, 1, -1, 1, 1]).reshape((3, 3))
>>> logits = Tensor(arr1, mstype.float32)
>>> labels = Tensor(arr2, mstype.float32)
>>> loss = ops.hinge_embedding_loss(logits, labels, margin=1.0, reduction='mean')
>>> print(loss)
0.16666666
"""
inputs_dtype = inputs.dtype
targets_dtype = targets.dtype
_check_hinge_embedding_loss_type(inputs_dtype, targets_dtype, inputs, targets, margin, reduction)
min_val = Tensor(0, inputs_dtype)
pos_index = targets > 0
neg_index = targets < 0
pos = pos_index * inputs
neg = neg_index * inputs
m = ops.cast(margin, inputs_dtype)
margin_matrix = m * neg_index
neg = margin_matrix - neg
neg = ops.clip_by_value(neg, min_val)
loss = pos + neg
if reduction == 'mean':
loss = loss.mean()
elif reduction == 'sum':
loss = loss.sum()
return loss
[文档]def ctc_greedy_decoder(inputs, sequence_length, merge_repeated=True):
r"""
Performs greedy decoding on the logits given in inputs.
Note:
On Ascend, 'merge_repeated' can not be set to false.
Args:
inputs (Tensor): The input Tensor must be a 3-D tensor whose shape is
:math:`(max\_time, batch\_size, num\_classes)`. `num_classes` must be `num_labels + 1` classes,
`num_labels` indicates the number of actual labels. Blank labels are reserved.
Default blank label is `num_classes - 1`. Data type must be float32 or float64.
sequence_length (Tensor): A tensor containing sequence lengths with the shape of :math:`(batch\_size, )`.
The type must be int32. Each value in the tensor must be equal to or less than `max_time`.
merge_repeated (bool): If ``true`` , merge repeated classes in output. Default: ``True`` .
Returns:
decoded_indices (Tensor), A tensor with shape of :math:`(total\_decoded\_outputs, 2)`.
Data type is int64.
decoded_values (Tensor), A tensor with shape of :math:`(total\_decoded\_outputs, )`,
it stores the decoded classes. Data type is int64.
decoded_shape (Tensor), A tensor with shape of :math:`(batch\_size, max\_decoded\_length)`.
Data type is int64.
log_probability (Tensor), A tensor with shape of :math:`(batch\_size, 1)`,
containing sequence log-probability, has the same type as `inputs`.
Raises:
TypeError: If `merge_repeated` is not a bool.
ValueError: If length of shape of `inputs` is not equal to 3.
ValueError: If length of shape of `sequence_length` is not equal to 1.
ValueError: If value in the `sequence_length` is larger than `max_time`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> inputs = Tensor(np.array([[[0.6, 0.4, 0.2], [0.8, 0.6, 0.3]],
... [[0.0, 0.6, 0.0], [0.5, 0.4, 0.5]]]), mindspore.float32)
>>> sequence_length = Tensor(np.array([2, 2]), mindspore.int32)
>>> decoded_indices, decoded_values, decoded_shape, log_probability = ops.ctc_greedy_decoder(inputs,
... sequence_length)
>>> print(decoded_indices)
[[0 0]
[0 1]
[1 0]]
>>> print(decoded_values)
[0 1 0]
>>> print(decoded_shape)
[2 2]
>>> print(log_probability)
[[-1.2]
[-1.3]]
"""
_ctc_greedy_decoder = _get_cache_prim(NN_OPS.CTCGreedyDecoder)(merge_repeated)
return _ctc_greedy_decoder(inputs, sequence_length)
def conv3d_transpose(inputs, weight, pad_mode='valid', padding=0, stride=1, dilation=1, group=1,
output_padding=0):
r"""
Computes a 3D transposed convolution, which is also known as a deconvolution
(although it is not an actual deconvolution).
Args:
inputs (Tensor): The gradients with respect to the output of the convolution.
The shape conforms to the default.
data_format :math:`(N, C_{in}, D_{out}, H_{out}, W_{out})`. Currently dout data type only supports float16
and float32.
weight (Tensor): Set size of kernel is :math:`(K_d, K_h, K_w)`, then the shape is
:math:`(C_{in}, C_{out}//group, K_d, K_h, K_w)`. Where :math:`group` is the Args parameter,
:math:`//` is the symbol for integer division.
Currently weight data type only supports float16 and float32.
pad_mode (str): Specifies padding mode. The optional values are
"same", "valid", "pad". Default: "valid".
- same: Adopts the way of completion. The depth, height and width of the output will be equal to
the input `x` divided by stride. The padding will be evenly calculated in head and tail, top and bottom,
left and right directions possibility.
Otherwise, the last extra padding will be calculated from the tail, bottom and the right side.
If this mode is set, `pad` must be 0.
- valid: Adopts the way of discarding. The possible largest depth, height and width of output
will be returned without padding. Extra pixels will be discarded. If this mode is set, `pad`
and `output_padding` must be 0.
- pad: Implicit paddings on both sides of the input in depth, height and width. The number of `pad` will
be padded to the input Tensor borders. `pad` must be greater than or equal to 0.
padding (Union(int, tuple[int])): The padding value to be filled. Default: 0. If `padding` is an integer, the
paddings of head, tail, top, bottom, left and right are the same, equal to pad. If `padding` is a tuple of
six integers, the padding of head, tail, top, bottom, left and right equal to padding[0], padding[1],
padding[2], padding[3], padding[4] and padding[5] correspondingly.
stride (Union(int, tuple[int])): The distance of kernel moving, an int number that represents
the depth, height and width of movement are both strides, or a tuple of three int numbers that
represent depth, height and width of movement respectively. Default: 1.
dilation (Union(int, tuple[int])): Specifies the space to use between kernel elements. Default: 1.
group (int): Splits input into groups. Default: 1. Only 1 is currently supported.
output_padding (Union(int, tuple[int])): Add extra size to each dimension of the output. Default: 0.
Outputs:
Tensor, the gradients with respect to the input of convolution 3D.
Tensor of shape :math:`(N, C_{out}//group, D_{out}, H_{out}, W_{out})`,
where :math:`group` is the Args parameter.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Raises:
TypeError: If `group` is not an int.
TypeError: If `stride`, `padding` , `dilation` or `output_padding` is neither an int not a tuple.
ValueError: If the rank of `inputs`, `weight` is not equal to 5.
ValueError: If `stride` or `dilation` is less than 1.
ValueError: if inputs[1], weight[1] and weight[2:5] i.e. `in_channel`, `out_channel` and `kernel_size` is less
than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid' nor 'pad'.
ValueError: If `padding` is a tuple whose length is not equal to 6.
ValueError: If `pad_mode` is not equal to 'padding' and `padding` is not equal to (0, 0, 0, 0, 0, 0).
ValueError: If `data_format` is not 'NCDHW'.
TypeError: If data type of dout and weight is not float16.
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor
>>> dout = Tensor(np.ones([32, 16, 10, 32, 32]), mindspore.float16)
>>> weight = Tensor(np.ones([16, 3, 4, 6, 2]), mindspore.float16)
>>> output = conv3d_transpose(dout, weight)
>>> print(output.shape)
(32, 3, 13, 37, 33)
"""
if len(inputs.shape) != 5:
raise_value_error("the rank of inputs tensor should be 5.")
if len(weight.shape) != 5:
raise_value_error("the rank of weight tensor should be 5.")
in_channel = inputs.shape[1]
out_channel = weight.shape[1]
kernel_size = weight.shape[2:5]
_conv_3d_transpose = _get_cache_prim(NN_OPS.Conv3DTranspose)(in_channel, out_channel, kernel_size, 1, pad_mode,
padding, stride, dilation, group, output_padding)
return _conv_3d_transpose(inputs, weight)
def _manipulate_padding(padding, dim):
"""convert padding to Conv2D padding"""
ms_padding = ()
if not isinstance(padding, (tuple, list)):
raise TypeError(f"For 'conv{dim}d', 'padding' must be a tuple, list or int, but got {type(padding)}.")
if len(padding) != dim:
raise ValueError(f"For 'conv{dim}d', 'padding' must be a tuple or list of {dim} integers, but got {padding}.")
for i in range(dim):
ms_padding += (padding[i], padding[i])
return ms_padding
def _dim_manipulation(x, name):
"""convert 1d dilation, stride, etc. to 2d"""
if isinstance(x, int):
if x <= 0:
raise ValueError(f"For 'conv1d', {name} must be a positive int, but got {x}.")
return 1, x
if isinstance(x, (tuple, list)):
if len(x) != 1:
raise ValueError(f"For 'conv1d', {name} must be a tuple/list with 1 element or int, but got {x}.")
if x[0] <= 0:
raise ValueError(f"For 'conv1d', elements in {name} must be positive int, but got {x}.")
return 1, x[0]
raise ValueError(f"For 'conv1d', {name} must be an int or a tuple/list with 1 element, but got {x}.")
def _check_conv_iterable_lengths(iterable, dim, iter_name):
"""check iterables lengths used in conv functions"""
if len(iterable) != dim:
raise ValueError(f"For 'conv{dim}d', the {iter_name} must be a int or a tuple/list with length {dim}, "
f"but got {iterable}.")
[文档]def conv1d(input, weight, bias=None, stride=1, pad_mode="valid", padding=0, dilation=1, groups=1):
r"""
Applies a 1D convolution over an input tensor. The input Tensor is typically
of shape :math:`(N, C_{in}, L_{in})`,
where :math:`N` is batch size, :math:`C` is channel number, :math:`L` is input sequence width.
The output is calculated based on formula:
.. math::
\text{out}(N_i, C_{\text{out}_j}) = \text{bias}(C_{\text{out}_j}) +
\sum_{k = 0}^{C_{in} - 1} \text{ccor}({\text{weight}(C_{\text{out}_j}, k), \text{X}(N_i, k)})
where :math:`bias` is the output channel bias, :math:`ccor` is
the `cross-correlation <https://en.wikipedia.org/wiki/Cross-correlation>`_,
, :math:`weight` is the convolution kernel value and :math:`X` represents the input feature map.
Here are the indices' meanings:
- :math:`i` corresponds to the batch number, the range is :math:`[0, N-1]`,
where :math:`N` is the batch size of the input.
- :math:`j` corresponds to the output channel, ranging from :math:`[0, C_{out}-1]`,
where :math:`C_{out}` is the number of
output channels, which is also equal to the number of kernels.
- :math:`k` corresponds to the input channel, ranging from :math:`[0, C_{in}-1]`,
where :math:`C_{in}` is the number of
input channels, which is also equal to the number of channels in the convolutional kernels.
Therefore, in the above formula, :math:`{bias}(C_{\text{out}_j})` represents the bias of the :math:`j`-th
output channel, :math:`{weight}(C_{\text{out}_j}, k)` represents the slice of the :math:`j`-th convolutional
kernel in the :math:`k`-th channel, and :math:`{X}(N_i, k)` represents the slice of the :math:`k`-th input
channel in the :math:`i`-th batch of the input feature map.
The shape of the convolutional kernel is given by :math:`(\text{kernel_size})`,
where :math:`\text{kernel_size}` is the width of the kernel.
If we consider the input and output channels as well as the `group` parameter, the complete kernel shape
will be :math:`(C_{out}, C_{in} / \text{group}, \text{kernel_size})`,
where `group` is the number of groups dividing `x`'s input channel when applying group convolution.
For more details about convolution layer, please refer to `Gradient Based Learning Applied to Document Recognition
<http://vision.stanford.edu/cs598_spring07/papers/Lecun98.pdf>`_
and `ConvNets <http://cs231n.github.io/convolutional-networks/>`_ .
Note:
On Ascend platform, only group convolution in depthwise convolution scenarios is supported.
That is, when `groups>1`, condition :math:`C_{in}` = :math:`C_{out}` = `groups` must be satisfied.
Args:
input (Tensor): Input Tensor of shape :math:`(N, C_{in}, L_{in})`.
weight (Tensor): The convolutional kernel value, it should has shape
:math:`(N, C_{in} / \text{groups}, \text{kernel_size})`.
bias (Tensor, optional): Bias Tensor with shape :math:`(C_{out})`.
When bias is None, zeros will be used. Default: ``None`` .
stride (Union(int, tuple[int]), optional): The distance of kernel moving, an int number or a tuple of one int
that represents width of movement. Default: ``1``.
pad_mode (str, optional): Specifies padding mode. The optional values are
``"same"`` , ``"valid"`` and ``"pad"`` . Default: ``"valid"`` .
- ``"same"``: Adopts the way of completion. The height and width of the output will be equal to
the input `x` divided by stride. The padding will be evenly calculated in left and right possiblily.
Otherwise, the last extra padding will be calculated from the right side.
If this mode is set, `padding` must be 0.
- ``"valid"``: Adopts the way of discarding. The possible largest width of output will be returned
without padding. Extra pixels will be discarded. If this mode is set, `padding` must be 0.
- ``"pad"``: Implicit paddings on both sides of the input `x`.
The number of `padding` will be padded to the input
Tensor borders. `padding` must be greater than or equal to 0.
padding (Union(int, tuple[int], list[int]), optional): Specifies the amount of padding to apply on
both side of `input` when `pad_mode` is set to ``"pad"``. The
paddings of left and right are the same, equal to padding or padding[0] when padding is a tuple of
1 integer. Default: ``0`` .
dilation (Union(int, tuple[int]), optional): Specifies the dilation rate to use for dilated convolution.
It can be a single int or a tuple of 1 integer.
Assuming :math:`dilation=(d0,)`, the convolutional kernel samples the input with a
spacing of :math:`d0-1` elements in the width direction.
The value should be in the ranges [1, L].
Default: ``1`` .
groups (int, optional): Splits `input` into groups. Default: ``1`` .
Returns:
Tensor, the value that applied 1D convolution. The shape is :math:`(N, C_{out}, L_{out})`.
To see how different pad modes affect the output shape, please refer to
:class:`mindspore.nn.Conv1d` for more details.
Raises:
TypeError: If `stride`, `padding` or `dilation` is neither an int nor a tuple.
TypeError: `groups` is not an int.
TypeError: If `bias` is not a Tensor.
ValueError: If the shape of `bias` is not :math:`(C_{out})` .
ValueError: If `stride` or `dilation` is less than 1.
ValueError: If `pad_mode` is not one of 'same', 'valid' or 'pad'.
ValueError: If `padding` is a tuple whose length is not equal to 1.
ValueError: If `pad_mode` is not equal to 'pad' and `padding` is greater than 0.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.arange(64).reshape((4, 4, 4)), mindspore.float32)
>>> weight = Tensor(np.arange(8).reshape((2, 2, 2)), mindspore.float32)
>>> bias = Tensor([-0.12345, 2.7683], mindspore.float32)
>>> output = ops.conv1d(x, weight, pad_mode='pad', padding=(1,), bias=bias, groups=2)
>>> print(output.shape)
(4, 2, 5)
"""
if input.ndim != 3:
raise ValueError(f"For 'conv1d', the input must be a 3D Tensor, but got input of {input.ndim}D.")
if weight.ndim != 3:
raise ValueError(f"For 'conv1d', the weight must be a 3D Tensor, but got input of {weight.ndim}D.")
expanded_input = expand_dims_(input, 2)
sqz = _get_cache_prim(P.Squeeze)(2)
weight_shape = weight.shape
out_channel = weight_shape[0]
kernel_size = (1, weight_shape[2])
expanded_weight = expand_dims_(weight, 2)
if isinstance(padding, int):
padding = (0, 0, padding, padding)
elif isinstance(padding, (tuple, list)):
if len(padding) != 1:
raise ValueError(f"For 'conv1d', padding must be a tuple or list with 1 element or int, but got {padding}.")
padding = (0, 0, padding[0], padding[0])
else:
raise TypeError(f"For 'conv1d', padding must be a tuple, list or int, but got {type(padding)}.")
input_shape = input.shape
in_channel = input_shape[1]
if not (in_channel % groups == 0 and out_channel % groups == 0):
raise ValueError(f"The argument 'groups' should be divisible by 'in_channel' " \
f"and 'out_channel', but got group:{groups}, in_channel:{in_channel}, " \
f"out_channel:{out_channel}.")
dilation = _dim_manipulation(dilation, name='dilation')
stride = _dim_manipulation(stride, name='stride')
conv = _get_cache_prim(P.Conv2D)(out_channel, kernel_size, 1, pad_mode, padding, stride, dilation, groups, "NCHW")
conv_res = conv(expanded_input, expanded_weight)
squeezed_conv_res = sqz(conv_res)
if bias is None:
return squeezed_conv_res
if not isinstance(bias, Tensor):
raise TypeError(f"For 'conv1d', the 'bias' must be a Tensor, but got {type(bias)}.")
if bias.shape[0] != out_channel:
raise ValueError(f"For 'conv1d', given weight of size {weight_shape}, expected bias to be 1-dimensional with " \
f"{out_channel} elements, but got bias of size {bias.shape[0]} instead.")
output = bias_add(squeezed_conv_res, bias)
return output
[文档]def conv2d(input, weight, bias=None, stride=1, pad_mode="valid", padding=0, dilation=1, groups=1):
r"""
Applies a 2D convolution over an input tensor. The input tenor is typically of
shape :math:`(N, C_{in}, H_{in}, W_{in})`, where :math:`N` is batch size, :math:`C` is
channel number, :math:`H` is feature height, :math:`W` is feature width.
The output is calculated based on formula:
.. math::
\text{out}(N_i, C_{\text{out}_j}) = \text{bias}(C_{\text{out}_j}) +
\sum_{k = 0}^{C_{in} - 1} \text{ccor}({\text{weight}(C_{\text{out}_j}, k), \text{X}(N_i, k)})
where :math:`bias` is the output channel bias, :math:`ccor` is
the `cross-correlation <https://en.wikipedia.org/wiki/Cross-correlation>`_,
, :math:`weight` is the convolution kernel value and :math:`X` represents the input feature map.
Here are the indices' meanings:
- :math:`i` corresponds to the batch number, the range is :math:`[0, N-1]`,
where :math:`N` is the batch size of the input.
- :math:`j` corresponds to the output channel, the range is :math:`[0, C_{out}-1]`,
where :math:`C_{out}` is the number of output channels, which is also equal to the number of kernels.
- :math:`k` corresponds to the input channel, the range is :math:`[0, C_{in}-1]`,
where :math:`C_{in}` is the number of
input channels, which is also equal to the number of channels in the convolutional kernels.
Therefore, in the above formula, :math:`{bias}(C_{out_j})` represents the bias of the :math:`j`-th
output channel, :math:`{weight}(C_{out_j}, k)` represents the slice of the :math:`j`-th convolutional
kernel in the :math:`k`-th channel, and :math:`{X}(N_i, k)` represents the slice of the :math:`k`-th input
channel in the :math:`i`-th batch of the input feature map.
The shape of the convolutional kernel is given by :math:`(\text{kernel_size[0]}, \text{kernel_size[1]})`,
where :math:`\text{kernel_size[0]}` and :math:`\text{kernel_size[1]}` are the height and width of the kernel,
respectively.
If we consider the input and output channels as well as the `group` parameter, the complete kernel shape
will be :math:`(C_{out}, C_{in} / \text{group}, \text{kernel_size[0]}, \text{kernel_size[1]})`,
where `group` is the number of groups dividing `x`'s input channel when applying group convolution.
For more details about convolution layer, please refer to `Gradient Based Learning Applied to Document Recognition
<http://vision.stanford.edu/cs598_spring07/papers/Lecun98.pdf>`_ and
`ConvNets <http://cs231n.github.io/convolutional-networks/>`_.
Note:
On Ascend platform, only group convolution in depthwise convolution scenarios is supported.
That is, when `groups>1`, condition :math:`C_{in}` = :math:`C_{out}` = `groups` must be satisfied.
Args:
input (Tensor): Tensor of shape :math:`(N, C_{in}, H_{in}, W_{in})`.
weight (Tensor): Tensor of shape
:math:`(N, C_{in} / \text{groups}, \text{kernel_size[0]}, \text{kernel_size[1]})`, then the size of kernel
is :math:`(\text{kernel_size[0]}, \text{kernel_size[1]})`.
bias (Tensor, optional): Bias Tensor with shape :math:`(C_{out})`.
When bias is ``None`` , zeros will be used. Default: ``None`` .
stride (Union(int, tuple[int]), optional): The distance of kernel moving, an int number that represents
the height and width of movement are both strides, or a tuple of two int numbers that
represent height and width of movement respectively. Default: ``1`` .
pad_mode (str, optional): Specifies padding mode. The optional values are
``"same"`` , ``"valid"`` and ``"pad"`` . Default: ``"valid"`` .
- same: Adopts the way of completion. The height and width of the output will be equal to
the input `x` divided by stride. The padding will be evenly calculated in top and bottom,
left and right possiblily. Otherwise, the last extra padding will be calculated from the bottom
and the right side. If this mode is set, `padding` must be 0.
- valid: Adopts the way of discarding. The possible largest height and width of output will be returned
without padding. Extra pixels will be discarded. If this mode is set, `padding` must be 0.
- pad: Implicit paddings on both sides of the input `x`. The number of `padding` will be padded to the input
Tensor borders. `padding` must be greater than or equal to 0.
padding (Union(int, tuple[int], list[int]), optional): Implicit paddings on both sides of the input `x`.
If `padding` is one integer, the paddings of top, bottom, left and right are the same, equal to padding.
If `padding` is a tuple/list with 2 integers, the padding of top adn bottom is padding[0],
and the padding of left and right is padding[1]. Default: ``0`` .
dilation (Union(int, tuple[int]), optional): Gaps between kernel elements.The data type is int or a tuple of
2 integers. Specifies the dilation rate to use for dilated convolution. If set to be :math:`k > 1`,
there will be :math:`k - 1` pixels skipped for each sampling location. Its value must
be greater than or equal to 1 and bounded by the height and width of the input `x`. Default: ``1`` .
groups (int, optional): Splits `input` into groups. Default: ``1`` .
Returns:
Tensor, the value that applied 2D convolution. The shape is :math:`(N, C_{out}, H_{out}, W_{out})`.
To see how different pad modes affect the output shape, please refer to
:class:`mindspore.nn.Conv2d` for more details.
Raises:
TypeError: If `stride`, `padding` or `dilation` is neither an int nor a tuple.
TypeError: `groups` is not an int.
TypeError: If `bias` is not a Tensor.
ValueError: If the shape of `bias` is not :math:`(C_{out})` .
ValueError: If `stride` or `dilation` is less than 1.
ValueError: If `pad_mode` is not one of 'same', 'valid' or 'pad'.
ValueError: If `padding` is a tuple/list whose length is not equal to 2.
ValueError: If `pad_mode` is not equal to 'pad' and `padding` is greater than 0.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.ones([10, 32, 32, 32]), mindspore.float32)
>>> weight = Tensor(np.ones([32, 32, 3, 3]), mindspore.float32)
>>> output = ops.conv2d(x, weight)
>>> print(output.shape)
(10, 32, 30, 30)
"""
if isinstance(stride, (tuple, list)):
_check_conv_iterable_lengths(stride, dim=2, iter_name='stride')
if isinstance(dilation, (tuple, list)):
_check_conv_iterable_lengths(dilation, dim=2, iter_name='dilation')
if isinstance(padding, (tuple, list)):
padding = _manipulate_padding(padding, dim=2)
weight_shape = weight.shape
out_channel = weight_shape[0]
kernel_size = weight_shape[2:4]
input_shape = input.shape
in_channel = input_shape[1]
if not (in_channel % groups == 0 and out_channel % groups == 0):
raise ValueError(f"The argument 'groups' should be divisible by 'in_channel' " \
f"and 'out_channel', but got group:{groups}, in_channel:{in_channel}, " \
f"out_channel:{out_channel}.")
conv = _get_cache_prim(P.Conv2D)(out_channel, kernel_size, 1, pad_mode, padding, stride, dilation, groups, "NCHW")
if bias is None:
return conv(input, weight)
if not isinstance(bias, Tensor):
raise TypeError(f"For 'conv2d', the 'bias' must be a Tensor, but got {type(bias)}.")
if bias.shape[0] != out_channel:
raise ValueError(f"For 'conv2d', Given weight of size {weight_shape}, expected bias to be 1-dimensional with " \
f"{out_channel} elements, but got bias of size {bias.shape[0]} instead.")
conv_result = conv(input, weight)
output = bias_add(conv_result, bias)
return output
def conv_transpose2d(input, weight, bias=None, stride=1, padding=0, output_padding=0, groups=1, dilation=1):
r"""
Calculates a 2D transposed convolution, which can be regarded as Conv2d for the gradient of the input,
also called deconvolution (although it is not an actual deconvolution).
The input is typically of shape :math:`(N, C_{in}, H_{in}, W_{in})`,
where :math:`N` is batch size, :math:`C_{in}` is space dimension,
:math:`H_{in}, W_{in}` are the height and width of the feature layer respectively.
When Conv2d and Conv2dTranspose are initialized with the same parameters, and `pad_mode` is set to 'pad',
:math:`dilation * (kernel\_size - 1) - padding` amount of zero will be paded to the height and width
directions of the input, they are inverses of each other in regard to the input and output shapes in this case.
However, when `stride` > 1, Conv2d maps multiple input shapes to the same output shape. Deconvolutional network
can refer to `Deconvolutional Networks <https://www.matthewzeiler.com/mattzeiler/deconvolutionalnetworks.pdf>`_.
Args:
input (Tensor): Tensor of shape :math:`(N, C_{in}, H_{in}, W_{in})`.
weight (Tensor): Tensor of shape
:math:`(N, C_{in} / \text{groups}, \text{kernel_size[0]}, \text{kernel_size[1]})`, then the size of kernel
is :math:`(\text{kernel_size[0]}, \text{kernel_size[1]})`.
bias (Tensor, optional): Bias Tensor with shape :math:`(C_{out})`.
When bias is ``None`` , zeros will be used. Default: ``None`` .
stride (Union(int, tuple[int]), optional): The distance of kernel moving, an int number that represents
the height and width of movement are both strides, or a tuple of two int numbers that
represent height and width of movement respectively. Default: ``1`` .
padding (Union(int, tuple[int], list[int]), optional): Implicit paddings on both sides of the input `x`.
Can be an integer or a tuple/list with 2 integers.
output_padding (Union[int, tuple[int]]): The number of padding on the height and width directions of the output.
The data type is an integer or a tuple of two integers. If `output_padding` is an integer,
then the bottom and right padding are all equal to `output_padding`. If `output_padding` is a tuple of
2 integers, then the bottom and right padding is equal to `output_padding[0]`, `output_padding[1]`
respectively.
groups (int, optional): Splits `input` into groups. Default: ``1`` .
dilation (Union(int, tuple[int]), optional): Gaps between kernel elements.The data type is int or a tuple of
2 integers. Specifies the dilation rate to use for dilated convolution. If set to be :math:`k > 1`,
there will be :math:`k - 1` pixels skipped for each sampling location. Its value must
be greater than or equal to 1 and bounded by the height and width of the input `x`. Default: ``1`` .
Returns:
Tensor, the value that applied 2D convolution. The shape is :math:`(N, C_{out}, H_{out}, W_{out})`.
To see how different pad modes affect the output shape, please refer to
:class:`mindspore.nn.Conv2dTranspose` for more details.
Raises:
TypeError: If `stride`, `padding` or `dilation` is neither an int nor a tuple.
TypeError: `groups` is not an int.
TypeError: If `bias` is not a Tensor.
ValueError: If the shape of `bias` is not :math:`(C_{out})` .
ValueError: If `stride` or `dilation` is less than 1.
ValueError: If `padding` is a tuple/list whose length is not equal to 2.
Supported Platforms:
``Ascend``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.ones([1, 6, 32, 32]), mindspore.float32)
>>> weight = Tensor(np.ones([6, 3, 5, 5]), mindspore.float32)
>>> output = ops.conv_transpose2d(x, weight)
>>> print(output.shape)
(1, 3, 36, 36)
"""
conv = _get_cache_prim(Convolution)(stride, padding, dilation, True, output_padding, groups)
return conv(input, weight, bias)
[文档]def hardsigmoid(input):
r"""
Hard sigmoid activation function.
Applies hard sigmoid activation element-wise. The input is a Tensor with any valid shape.
Hard sigmoid is defined as:
.. math::
\text{hsigmoid}(x_{i}) = \max(0, \min(1, \frac{x_{i} + 3}{6}))
where :math:`x_i` is an element of the input Tensor.
HSigmoid Activation Function Graph:
.. image:: ../images/HSigmoid.png
:align: center
Args:
input (Tensor): The input Tensor.
Returns:
A Tensor whose dtype and shape are the same as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not int or float.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([ -3.5, 0, 4.3]), mindspore.float32)
>>> output = ops.hardsigmoid(x)
>>> print(output)
[0. 0.5 1. ]
"""
hardsigmoid_ = NN_OPS.HSigmoid()
return hardsigmoid_(input)
[文档]def hardtanh(input, min_val=-1.0, max_val=1.0):
r"""
Applies the hardtanh activation function element-wise. The activation function is defined as:
.. math::
\text{hardtanh}(input) = \begin{cases}
max\_val, & \text{ if } input > max\_val \\
min\_val, & \text{ if } input < min\_val \\
input, & \text{ otherwise. }
\end{cases}
Linear region range :math:`[min\_val, max\_val]` can be adjusted using `min_val` and `max_val`.
Hardtanh Activation Function Graph:
.. image:: ../images/Hardtanh.png
:align: center
Args:
input (Tensor): Input Tensor.
min_val (Union[int, float], optional): Minimum value of the linear region range. Default: ``-1.0`` .
max_val (Union[int, float], optional): Maximum value of the linear region range. Default: ``1.0`` .
Returns:
Tensor, with the same dtype and shape as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `min_val` is neither float nor int.
TypeError: If dtype of `max_val` is neither float nor int.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> x = Tensor([-1, -2, 0, 2, 1], mindspore.float16)
>>> output = ops.hardtanh(x, min_val=-1.0, max_val=1.0)
>>> print(output)
[-1. -1. 0. 1. 1.]
"""
_check_is_tensor('input', input, "hardtanh")
_check_value_type("min_val", min_val, [int, float], "hardtanh")
_check_value_type("max_val", max_val, [int, float], "hardtanh")
input_dtype = input.dtype
input = maximum_(input, min_val)
input = minimum_(input, max_val)
return input.astype(input_dtype)
[文档]def huber_loss(input, target, reduction='mean', delta=1.0):
r"""
Calculates the error between the predicted value and the target value,
which has the best of both the loss of :func:`mindspore.ops.l1_loss` and the loss of :func:`mindspore.ops.mse_loss`.
Assuming that the :math:`x` and :math:`y` are 1-D Tensor, length :math:`N`, the `reduction` parameter
is set to ``'none'`` then calculate the loss of :math:`x` and :math:`y` without dimensionality reduction.
The formula is as follows:
.. math::
\ell(x, y) = L = \{l_1,\dots,l_N\}^\top
with
.. math::
l_n = \begin{cases}
0.5 * (x_n - y_n)^2, & \text{if } |x_n - y_n| < delta; \\
delta * (|x_n - y_n| - 0.5 * delta), & \text{otherwise. }
\end{cases}
where :math:`N` is the batch size.
If `reduction` is "mean" or "sum", then:
.. math::
\ell(x, y) =
\begin{cases}
\operatorname{mean}(L), & \text{if reduction} = \text{"mean";}\\
\operatorname{sum}(L), & \text{if reduction} = \text{"sum".}
\end{cases}
Args:
input (Tensor): Predicted value, Tensor of any dimension.
target (Tensor): Target value, has same dtype and shape as the `input` in common cases.
However, when the shape of `target` is different from the shape of `input`,
and they should be broadcasted to each other.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
delta (Union[int, float]): The threshold to change between two type of loss.
The value must be greater than zero. Default: ``1.0`` .
Returns:
Tensor or Scalar, if `reduction` is ``'none'``, return a Tensor with same shape and dtype as `input`.
Otherwise, a scalar value will be returned.
Raises:
TypeError: If `input` or `target` is not a Tensor.
TypeError: If dtype of `delta` is neither float nor int.
ValueError: If `delta` is less than or equal to 0.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'``, ``'sum'``.
ValueError: If `input` and `target` have different shapes and cannot be broadcasted to each other.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> x = Tensor([1, 2, 10, 2], mindspore.float32)
>>> target = Tensor([1, 5, 1, 20], mindspore.float32)
>>> output = ops.huber_loss(x, target, reduction="mean", delta=2)
>>> print(output)
13.5
"""
_check_is_tensor('input', input, "huber_loss")
_check_is_tensor('target', target, "huber_loss")
_check_value_type("delta", delta, [int, float], "huber_loss")
_check_number_gt_value("delta", delta, 0.0, "huber_loss")
z = sub_(input, target)
z = abs_(z)
cond = less_(z, delta)
l1 = mul_(0.5, square_(z))
l2 = mul_(delta, sub_(z, 0.5 * delta))
loss = select_(cond, l1, l2)
return _get_loss(loss, reduction, "huber_loss")
@_primexpr
def _check_adaptive_avg_pool1d_output_size(output_size):
"""Check the output_size value in adaptive_avg_pool1d op."""
validator.check_int(output_size, 1, validator.GE, "output_size", 'adaptive_avg_pool1d')
validator.check_value_type('output_size', output_size, [int], 'adaptive_avg_pool1d')
[文档]def adaptive_avg_pool1d(input, output_size):
r"""
Applies a 1D adaptive average pooling over an input Tensor which can be regarded as a composition of 1D input
planes.
Typically, the input is of shape :math:`(N, C, L_{in})`, adaptive_avg_pool1d outputs regional average
in the :math:`L_{in}`-dimension. The output is of shape :math:`(N, C, L_{out})`, where :math:`L_{out}`
is defined by `output_size`.
Note:
:math:`L_{in}` must be divisible by `output_size`.
Args:
input (Tensor): Tensor of shape :math:`(N, C, L_{in})`, with float16 or float32 data type.
output_size (int): the target output size :math:`L_{out}`.
Returns:
Tensor of shape :math:`(N, C, L_{out})`, has the same type as `input`.
Raises:
TypeError: If `output_size` is not an int.
TypeError: If `input` is neither float16 nor float32.
ValueError: If `output_size` is less than 1.
ValueError: If length of shape of `input` is not equal to 3.
ValueError: If the last dimension of `input` is smaller than `output_size`.
ValueError: If the last dimension of `input` is not divisible by `output_size`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input = Tensor(np.random.randint(0, 10, [1, 3, 6]), mindspore.float32)
>>> output = ops.adaptive_avg_pool1d(input, output_size=2)
>>> print(output.shape)
(1, 3, 2)
"""
def _check(x, output_size):
x_in_shape = x.shape
x_dtype = dtype_(x)
if not isinstance(x, (Tensor, Tensor_)):
raise TypeError("For adaptive_avg_pool1d, the input input must be tensor")
_check_adaptive_avg_pool1d_output_size(output_size)
if len(x_in_shape) != 3:
raise ValueError(f"For adaptive_avg_pool1d input must have 3 dim, but got {len(x_in_shape)}.")
if x_in_shape[2] < output_size:
raise ValueError(f"For adaptive_avg_pool1d input's last dimension must be greater or equal to " \
f"output size {output_size}, but got {x_in_shape[2]}.")
if x_in_shape[2] % output_size != 0:
raise ValueError(f"For adaptive_avg_pool1d input's last dimension must be divisible by "
f"output size {output_size}, but got {x_in_shape[2]}.")
if x_dtype not in [mstype.float16, mstype.float32]:
raise TypeError(f"For adaptive_avg_pool1d, the input dtype must be float16 or float32, " \
f"but got {x_dtype}.")
_check(input, output_size)
x_in_shape = input.shape
squeeze_ = _get_cache_prim(P.Squeeze)(2)
width = x_in_shape[2]
stride = width // output_size
kernel_size = width - (output_size - 1) * stride
stride = (1, width // output_size)
kernel_size = (1, kernel_size)
avg_pool_ = _get_cache_prim(P.AvgPool)(kernel_size=kernel_size, strides=stride)
input = expand_dims_(input, 2)
input = avg_pool_(input)
input = squeeze_(input)
return input
[文档]def layer_norm(input, normalized_shape, weight=None, bias=None, eps=1e-5):
r"""Applies the Layer Normalization on the mini-batch input.
Layer normalization is widely used in recurrent neural networks. Apply normalization to the mini-batch
input of a single training case. LayerNorm is described in the paper
`Layer Normalization <https://arxiv.org/abs/1607.06450>`_.
Unlike batch normalization, layer normalization performs the exact same calculations at training and
test time. Applies to all channels and pixels, even batch_size=1. The formula is as follows:
.. math::
y = \frac{x - \mathrm{E}[x]}{\sqrt{\mathrm{Var}[x] + \epsilon}} * \gamma + \beta
where :math:`\gamma` is the weight value learned through training, :math:`\beta` is the bias value
learned through training.
Args:
input (Tensor): The shape of input is `(N, *)`, where `*` represents any additional dimension.
normalized_shape (Union(int, tuple[int], list[int])): The normalized shape of `input` for LayerNorm.
`normalized_shape` equal to `input_shape[begin_norm_axis:]`, where `begin_norm_axis` represents the axis
where normalization begins.
weight (Tensor, optional): Learnable parameter :math:`\gamma` . Tensor of shape `normalized_shape`.
Default: ``None``, has the same data type with `input`. Initialized to ``1`` when `weight` is None.
bias (Tensor, optional): Learnable parameter :math:`\beta` . Tensor of shape `normalized_shape`.
Default: ``None``, has the same data type with `input`. Initialized to ``0`` when `bias` is None.
eps (float, optional): A value added to the denominator for numerical stability(:math:`\epsilon`).
Default: ``1e-5`` .
Returns:
Tensor. The normalized tensor, has the same type and shape as the `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If `normalized_shape` is not an integer, a list or a tuple.
TypeError: If `eps` is not a float.
Supported Platforms:
``Ascend``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.array([[1, 2, 3], [1, 2, 3]]), mindspore.float32)
>>> normalized_shape = (3,)
>>> gamma = Tensor(np.ones(normalized_shape), mindspore.float32)
>>> beta = Tensor(np.zeros(normalized_shape), mindspore.float32)
>>> eps = 1e-7
>>> output = ops.layer_norm(input_x, normalized_shape, gamma, beta, eps)
>>> print(output)
[[-1.2247448 0. 1.2247448]
[-1.2247448 0. 1.2247448]]
"""
if weight is None:
weight = ops.ones(normalized_shape, dtype=input.dtype)
if bias is None:
bias = ops.zeros(normalized_shape, dtype=input.dtype)
return layer_norm_ext_op(input, normalized_shape, weight, bias, eps)[0]
[文档]def group_norm(input, num_groups, weight=None, bias=None, eps=1e-5):
r"""Group Normalization over a mini-batch of inputs.
Group Normalization is widely used in recurrent neural networks. It applies
normalization on a mini-batch of inputs for each single training case as described
in the paper `Group Normalization <https://arxiv.org/pdf/1803.08494.pdf>`_. Group Normalization
divides the channels into groups and computes within each group the mean and variance for normalization,
and it performs very stable over a wide range of batch size. :math:`\gamma` and :math:`\beta` are trainable scale
and shift.
It can be described using the following formula:
.. math::
y = \frac{x - \mathrm{E}[x]}{\sqrt{\mathrm{Var}[x] + \epsilon}} * \gamma + \beta
where :math:`\gamma` is `weight`, :math:`\beta` is `bias`, :math:`\epsilon` is `eps`.
Args:
input (Tensor): The input feature with shape :math:`(N, C, *)` where :math:`*` means, any number of
additional dimensions.
num_groups (int): The number of groups to be divided along the channel dimension.
weight (Tensor, optional): The shape :math:`(C,)`, Default: ``None``, has the same data type with `input`.
bias (Tensor, optional): The shape :math:`(C,)`, Default: ``None``, has the same data type with `input`.
eps (float, optional): A value added to the denominator for numerical stability. Default: ``1e-5`` .
Returns:
Tensor, the normalized and scaled offset tensor, has the same shape and data type as the `input`.
Raises:
TypeError: If `num_groups` is not an int.
TypeError: If `eps` is not a float.
ValueError: If `num_groups` is less than 1.
ValueError: If `C` (the second parameter of dimensions of `input`) is not divided by `num_groups`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> import numpy as np
>>> from mindspore import ops
>>> x = ms.Tensor(np.ones([1, 2, 4, 4], np.float32))
>>> output = ops.group_norm(x, 2)
>>> print(output)
[[[[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]]
[[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]]]]
"""
if weight is None:
weight = ops.ones([input.shape[1]], dtype=input.dtype)
if bias is None:
bias = ops.zeros([input.shape[1]], dtype=input.dtype)
return group_norm_op(input, num_groups, weight, bias, eps)[0]
[文档]def batch_norm_ext(input, running_mean, running_var, weight=None, bias=None, training=False, momentum=0.1, eps=1e-5):
r"""
Batch Normalization for input data and updated parameters.
Batch Normalization is widely used in convolutional neural networks. This operation
applies Batch Normalization over inputs to avoid internal covariate shift as described
in the paper `Batch Normalization: Accelerating Deep Network Training by Reducing Internal
Covariate Shift <https://arxiv.org/abs/1502.03167>`_. It rescales and recenters the
features using a mini-batch of data and the learned parameters can be described
in the following formula,
.. math::
y = \frac{x - mean}{\sqrt{variance + \epsilon}} * \gamma + \beta
where :math:`\gamma` is `weight`, :math:`\beta` is `bias`, :math:`\epsilon` is `eps`, :math:`mean` is the
mean of :math:`x`, :math:`variance` is the variance of :math:`x`.
Args:
input (Tensor): Tensor of shape :math:`(N, C, *)`, with bfloat16, float16 or float32 data type.
For Atlas training products, the shape must be 2-4 dimensions currently.
running_mean (Tensor): The shape :math:`(C,)`, with bfloat, float16 or float32 data type.
running_var (Tensor): The shape :math:`(C,)`, with bfloat, float16 or float32 data type.
weight (Tensor, optional): The shape :math:`(C,)`, with bfloat, float16 or float32 data type, Default: ``None``.
Initialized to ``1`` when `weight` is None.
bias (Tensor, optional): The shape :math:`(C,)`, with bfloat, float16 or float32 data type. Default: ``None``.
Initialized to ``0`` when `weight` is None.
training (bool, optional): If `training` is `True`, `mean` and `variance` are computed during training.
If `training` is `False`, they're loaded from checkpoint during inference. Default: ``False`` .
momentum (float, optional): The hyper parameter to compute moving average for `running_mean` and `running_var`
(e.g. :math:`new\_running\_mean = (1 - momentum) * running\_mean + momentum * current\_mean`).
Default: ``0.1`` .
eps (float, optional): A small value added for numerical stability. Default: ``1e-5``.
Returns:
Tensor, has the same type and shape as `input`. The shape is :math:`(N, C, *)`.
Raises:
TypeError: If `training` is not a bool.
TypeError: If dtype of `eps` or `momentum` is not float.
TypeError: If `input`, `weight`, `bias`, `running_mean` or `running_var` is not a Tensor.
Supported Platforms:
``Ascend``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> input_x = Tensor([[1.0, 2.0], [3.0, 4.0]], mindspore.float32)
>>> running_mean = Tensor([0.5, 1.5], mindspore.float32)
>>> running_var = Tensor([0.1, 0.2], mindspore.float32)
>>> weight = Tensor([2.0, 2.0], mindspore.float32)
>>> bias = Tensor([-1.0, -1.0], mindspore.float32)
>>> output = ops.function.nn_func.batch_norm_ext(input_x, running_mean, running_var, weight, bias)
>>> print(output)
[[ 2.1621194 1.2360122]
[14.810596 10.180061 ]]
"""
if weight is None:
weight = ops.ones([input.shape[1]], dtype=input.dtype)
if bias is None:
bias = ops.zeros([input.shape[1]], dtype=input.dtype)
output = batch_norm_ext_op(input, weight, bias, running_mean, running_var, training, momentum, eps)
return output[0]
[文档]def batch_norm(input_x, running_mean, running_var, weight, bias, training=False, momentum=0.1, eps=1e-5):
r"""
Batch Normalization for input data and updated parameters.
Batch Normalization is widely used in convolutional neural networks. This operation
applies Batch Normalization over inputs to avoid internal covariate shift as described
in the paper `Batch Normalization: Accelerating Deep Network Training by Reducing Internal
Covariate Shift <https://arxiv.org/abs/1502.03167>`_. It rescales and recenters the
features using a mini-batch of data and the learned parameters can be described
in the following formula,
.. math::
y = \frac{x - mean}{\sqrt{variance + \epsilon}} * \gamma + \beta
where :math:`\gamma` is `weight`, :math:`\beta` is `bias`, :math:`\epsilon` is `eps`, :math:`mean` is the
mean of :math:`x`, :math:`variance` is the variance of :math:`x`.
.. warning::
- For Atlas 200/300/500 inference product,
the result accuracy fails to reach 1‰ due to the square root instruction.
Note:
- If `training` is `False`, `weight`, `bias`, `running_mean` and `running_var` are Tensors.
- If `training` is `True`, `weight`, `bias`, `running_mean` and `running_var` are Parameters.
Args:
input_x (Tensor): Tensor of shape :math:`(N, C)`, with float16 or float32 data type.
running_mean (Union[Tensor, Parameter]): The shape :math:`(C,)`, has the same data type with `weight`.
running_var (Union[Tensor, Parameter]): The shape :math:`(C,)`, has the same data type with `weight`.
weight (Union[Tensor, Parameter]): The shape :math:`(C,)`, with float16 or float32 data type.
bias (Union[Tensor, Parameter]): The shape :math:`(C,)`, has the same data type with `weight`.
training (bool, optional): If `training` is `True`, `mean` and `variance` are computed during training.
If `training` is `False`, they're loaded from checkpoint during inference. Default: ``False`` .
momentum (float, optional): The hyper parameter to compute moving average for `running_mean` and `running_var`
(e.g. :math:`new\_running\_mean = (1 - momentum) * running\_mean + momentum * current\_mean`).
Momentum value must be `[0, 1]`. Default: ``0.1`` .
eps (float, optional): A small value added for numerical stability. Default: ``1e-5``, value must be `(0, 1]` .
Returns:
output_x (Tensor) - The same type and shape as the `input_x`. The shape is :math:`(N, C)`.
Raises:
TypeError: If `training` is not a bool.
TypeError: If dtype of `eps` or `momentum` is not float.
TypeError: If `input_x`, `weight`, `bias`, `running_mean` or `running_var` is not a Tensor.
TypeError: If dtype of `input_x`, `weight` is neither float16 nor float32.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> input_x = Tensor([[1.0, 2.0], [3.0, 4.0]], mindspore.float32)
>>> running_mean = Tensor([0.5, 1.5], mindspore.float32)
>>> running_var = Tensor([0.1, 0.2], mindspore.float32)
>>> weight = Tensor([2.0, 2.0], mindspore.float32)
>>> bias = Tensor([-1.0, -1.0], mindspore.float32)
>>> output = ops.batch_norm(input_x, running_mean, running_var, weight, bias)
>>> print(output)
[[ 2.1621194 1.2360122]
[14.810596 10.180061 ]]
"""
batch_norm_op = _get_cache_prim(P.BatchNorm)(is_training=training, epsilon=eps, momentum=momentum)
output = batch_norm_op(input_x, weight, bias, running_mean, running_var)
return output[0]
[文档]def bias_add(input_x, bias):
r"""
Returns the sum of the `input_x` and the `bias` Tensor. Before adding, the `bias` Tensor will be broadcasted to be
consistent with the shape of the `input_x` Tensor.
Args:
input_x (Tensor): The input tensor. The shape can be 2-5 dimensions. Supported dtypes:
- Ascend/CPU: all Number type.
- GPU: float16, float32, int8.
bias (Tensor): The bias tensor, with shape :math:`(C)`. C must be the same as channel dimension C of
`input_x`. It has the same type as `input_x`.
Returns:
Tensor, with the same shape and data type as `input_x`.
Raises:
TypeError: If `input_x` or `bias` is not a Tensor.
TypeError: If dtype of `input_x` and `bias` is inconsistent.
TypeError: If dimension of `input_x` is not in the range [2, 5].
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = Tensor(np.arange(6).reshape((2, 3)), mindspore.float32)
>>> bias = Tensor(np.random.random(3).reshape((3)), mindspore.float32)
>>> output = ops.bias_add(input_x, bias)
>>> print(output.shape)
(2, 3)
"""
bias_add_op = _get_cache_prim(P.BiasAdd)(data_format="NCHW")
return bias_add_op(input_x, bias)
[文档]def binary_cross_entropy(logits, labels, weight=None, reduction='mean'):
r"""
Computes the binary cross entropy(Measure the difference information between two probability distributions) between
predictive value `logits` and target value `labels`.
Set `logits` as :math:`x`, `labels` as :math:`y`, output as :math:`\ell(x, y)`, the
weight of nth batch of binary cross entropy is :math:`w_n`.
Let,
.. math::
L = \{l_1,\dots,l_N\}^\top, \quad
l_n = - w_n \left[ y_n \cdot \log x_n + (1 - y_n) \cdot \log (1 - x_n) \right]
In which, :math:`L` indicates the loss of all `batch_size`, :math:`l` indicates the loss of one `batch_size`,
and :math:`n` indicates one `batch_size` in the :math:`1-N` range. Then,
.. math::
\ell(x, y) = \begin{cases}
L, & \text{if reduction} = \text{'none';}\\
\operatorname{mean}(L), & \text{if reduction} = \text{'mean';}\\
\operatorname{sum}(L), & \text{if reduction} = \text{'sum'.}
\end{cases}
.. warning::
- The value of `logits` must range from `0` to `l`.
Args:
logits (Tensor): The predictive value whose data type must be float16 or float32.
labels (Tensor): The target value which has the same shape and data type as `logits`.
And the data type is float16 or float32.
weight (Tensor, optional): A rescaling weight applied to the loss of each batch element.
Its shape must be able to broadcast to that of `logits` and `labels`.
And it must have the same shape and data type as `logits`. Default: ``None`` . If set to ``None`` ,
the loss function
will not consider any sample weights, and each sample will be treated as having equal importance
when calculating the loss.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the weighted mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor or Scalar. Returns Tensor that has the same dtype and shape as `logits` if `reduction` is 'none'.
Otherwise, returns a scalar Tensor.
Raises:
TypeError: If `logits`, `labels` or `weight` is not a Tensor.
TypeError: If dtype of `logits`, `labels` or `weight` (if given) is neither float16 nor float32.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'`` or ``'sum'``.
ValueError: If shape of `labels` is not the same as `logits` or `weight` (if given).
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> logits = Tensor(np.array([0.2, 0.7, 0.1]), mindspore.float32)
>>> labels = Tensor(np.array([0., 1., 0.]), mindspore.float32)
>>> weight = Tensor(np.array([1, 2, 2]), mindspore.float32)
>>> output = ops.binary_cross_entropy(logits, labels, weight)
>>> print(output)
0.38240486
"""
binary_cross_entropy_op = _get_cache_prim(P.BinaryCrossEntropy)(reduction=reduction)
return binary_cross_entropy_op(logits, labels, weight)
[文档]def conv3d(input, weight, bias=None, stride=1, pad_mode="valid", padding=0, dilation=1, groups=1):
r"""
Applies a 3D convolution over an input tensor. The input tensor is typically of
shape :math:`(N, C_{in}, D_{in}, H_{in}, W_{in})`, where :math:`N` is batch size, :math:`C`
is channel number, :math:`D, H, W` are the depth, height and width of the feature graph, respectively.
The output is calculated based on formula:
.. math::
\text{out}(N_i, C_{\text{out}_j}) = \text{bias}(C_{\text{out}_j}) +
\sum_{k = 0}^{C_{in} - 1} \text{ccor}({\text{weight}(C_{\text{out}_j}, k), \text{X}(N_i, k)})
where :math:`bias` is the output channel bias, :math:`ccor` is
the `cross-correlation <https://en.wikipedia.org/wiki/Cross-correlation>`_
, :math:`weight` is the convolution kernel value and :math:`X` represents the input feature map.
Here are the indices' meanings:
- :math:`i` corresponds to the batch number, the range is :math:`[0, N-1]`,
where :math:`N` is the batch size of the input.
- :math:`j` corresponds to the output channel, the range is :math:`[0, C_{out}-1]`,
where :math:`C_{out}` is the number of
output channels, which is also equal to the number of kernels.
- :math:`k` corresponds to the input channel, the range is :math:`[0, C_{in}-1]`,
where :math:`C_{in}` is the number of
input channels, which is also equal to the number of channels in the convolutional kernels.
Therefore, in the above formula, :math:`{bias}(C_{\text{out}_j})` represents the bias of the :math:`j`-th
output channel, :math:`{weight}(C_{\text{out}_j}, k)` represents the slice of the :math:`j`-th convolutional
kernel in the :math:`k`-th channel, and :math:`{X}(N_i, k)` represents the slice of the :math:`k`-th input
channel in the :math:`i`-th batch of the input feature map.
The shape of the convolutional kernel is given by
:math:`(\text{kernel_size[0]}, \text{kernel_size[1]}, \text{kernel_size[2]})`
where :math:`\text{kernel_size[0]}` , :math:`\text{kernel_size[1]}` and :math:`\text{kernel_size[2]}` are the depth,
height and width of the kernel, respectively.
If we consider the input and output channels as well as the `group` parameter, the complete kernel shape
will be :math:`(C_{out}, C_{in} / \text{group}, \text{kernel_size[0]},
\text{kernel_size[1]}, \text{kernel_size[2]})`,
where `group` is the number of groups dividing `x`'s input channel when applying group convolution.
For more details about convolution layer, please refer to `Gradient Based Learning Applied to Document Recognition
<http://vision.stanford.edu/cs598_spring07/papers/Lecun98.pdf>`_.
Note:
1. On Ascend platform, :math:`groups = 1` must be satisfied.
2. On Ascend platform, :math:`dilation=1` must be satisfied.
Args:
input (Tensor): Tensor of shape :math:`(N, C_{in}, D_{in}, H_{in}, W_{in})`.
weight (Tensor): Set size of kernel is :math:`(\text{kernel_size[0]}, \text{kernel_size[1]},
\text{kernel_size[2]})`, then the shape is :math:`(C_{out}, C_{in}, \text{kernel_size[0]},
\text{kernel_size[1]}, \text{kernel_size[1]})`.
bias (Tensor, optional): Bias Tensor with shape :math:`(C_{out})`.
When bias is None, zeros will be used. Default: ``None`` .
stride (Union[int, tuple[int]], optional): The distance of kernel moving,
it can be an int number that represents
the depth, height and width of movement or a tuple of three int numbers that
represent depth, height and width movement respectively. Default: ``1`` .
pad_mode (str, optional): Specifies padding mode. The optional values are
``"same"`` , ``"valid"`` and ``"pad"`` . Default: ``"valid"`` .
- ``"same"``: Adopts the way of completion. The depth, height and width of the output will be equal to
the input `x` divided by stride. The padding will be evenly calculated in head and tail, top and bottom,
left and right directions possiblily.
Otherwise, the last extra padding will be calculated from the tail, bottom and the right side.
If this mode is set, `pad` must be 0.
- ``"valid"``: Adopts the way of discarding. The possible largest depth, height and width of output
will be returned without padding. Extra pixels will be discarded. If this mode is set, `pad`
must be 0.
- ``"pad"``: Implicit paddings on both sides of the input in depth, height and width.
The number of `pad` will be padded to the input Tensor borders. `pad` must be greater than or equal to 0.
padding (Union[int, tuple[int], list[int]], optional): The pad value to be filled. If `pad` is an integer,
the paddings of head, tail, top, bottom, left and right are the same, equal to pad.
If `pad` is a tuple/list of 3 integers, the padding of head, tail, top, bottom,
left and right equal to pad[0], pad[0], pad[1], pad[1], pad[2] and pad[2] correspondingly. Default: ``0`` .
dilation (Union[int, tuple[int]], optional): The data type is int or a tuple of 3 integers
:math:`(dilation_d, dilation_h, dilation_w)`. Currently, dilation on depth only supports the case of 1
on Ascend backend. Specifies the dilation rate to use for dilated convolution. If set :math:`k > 1`,
there will be :math:`k - 1` pixels skipped for each sampling location.
The value ranges for the depth, height, and width dimensions are [1, D], [1, H], and [1, W],
respectively. Default: ``1`` .
groups (int, optional):The number of groups into which the filter is divided. Default: ``1`` .
Returns:
Tensor, the value that applied 3D convolution. The shape is :math:`(N, C_{out}, D_{out}, H_{out}, W_{out})`.
`pad_mode` is ``"same"``:
.. math::
\begin{array}{ll} \\
D_{out} = \left \lceil{\frac{D_{in}}{\text{stride[0]}}} \right \rceil \\
H_{out} = \left \lceil{\frac{H_{in}}{\text{stride[1]}}} \right \rceil \\
W_{out} = \left \lceil{\frac{W_{in}}{\text{stride[2]}}} \right \rceil \\
\end{array}
`pad_mode` is ``"valid"``:
.. math::
\begin{array}{ll} \\
D_{out} = \left \lfloor{\frac{D_{in} - \text{dilation[0]} \times (\text{kernel_size[0]} - 1) }
{\text{stride[0]}} + 1} \right \rfloor \\
H_{out} = \left \lfloor{\frac{H_{in} - \text{dilation[1]} \times (\text{kernel_size[1]} - 1) }
{\text{stride[1]}} + 1} \right \rfloor \\
W_{out} = \left \lfloor{\frac{W_{in} - \text{dilation[2]} \times (\text{kernel_size[2]} - 1) }
{\text{stride[2]}} + 1} \right \rfloor \\
\end{array}
`pad_mode` is ``"pad"``:
.. math::
\begin{array}{ll} \\
D_{out} = \left \lfloor{\frac{D_{in} + padding[0] + padding[1] - (\text{dilation[0]} - 1) \times
\text{kernel_size[0]} - 1 }{\text{stride[0]}} + 1} \right \rfloor \\
H_{out} = \left \lfloor{\frac{H_{in} + padding[2] + padding[3] - (\text{dilation[1]} - 1) \times
\text{kernel_size[1]} - 1 }{\text{stride[1]}} + 1} \right \rfloor \\
W_{out} = \left \lfloor{\frac{W_{in} + padding[4] + padding[5] - (\text{dilation[2]} - 1) \times
\text{kernel_size[2]} - 1 }{\text{stride[2]}} + 1} \right \rfloor \\
\end{array}
Raises:
TypeError: If `out_channel` or `groups` is not an int.
TypeError: If `stride`, `padding` or `dilation` is neither an int nor a tuple.
TypeError: If `bias` is not a Tensor.
ValueError: If the shape of `bias` is not :math:`(C_{out})`.
ValueError: If `stride` or `dilation` is less than 1.
ValueError: If `pad_mode` is not one of 'same', 'valid' or 'pad'.
ValueError: If `padding` is a tuple or list whose length is not equal to 3.
ValueError: If `pad_mode` is not equal to 'pad' and `pad` is greater than 0.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.ones([16, 3, 10, 32, 32]), mindspore.float16)
>>> weight = Tensor(np.ones([32, 3, 4, 3, 3]), mindspore.float16)
>>> output = ops.conv3d(x, weight, pad_mode="same", padding=0, stride=1, dilation=1, groups=1)
>>> print(output.shape)
(16, 32, 10, 32, 32)
>>> output = ops.conv3d(x, weight, pad_mode="valid", padding=0, stride=1, dilation=1, groups=1)
>>> print(output.shape)
(16, 32, 7, 30, 30)
>>> output = ops.conv3d(x, weight, pad_mode="pad", padding=(2, 1, 1), stride=1, dilation=1, groups=1)
>>> print(output.shape)
(16, 32, 11, 32, 32)
"""
weight_shape = weight.shape
out_channel = weight_shape[0]
kernel_size = weight_shape[2:5]
if isinstance(stride, (tuple, list)):
_check_conv_iterable_lengths(stride, dim=3, iter_name='stride')
if isinstance(dilation, (tuple, list)):
_check_conv_iterable_lengths(dilation, dim=3, iter_name='dilation')
input_shape = input.shape
in_channel = input_shape[1]
if not (in_channel % groups == 0 and out_channel % groups == 0):
raise ValueError("The argument 'groups' should be divisible by 'in_channel' " \
"and 'out_channel'")
if isinstance(padding, (list, tuple)):
padding = _manipulate_padding(padding, dim=3)
conv = _get_cache_prim(P.Conv3D)(out_channel, kernel_size, 1, pad_mode, padding, stride, dilation, groups, "NCDHW")
if bias is None:
return conv(input, weight)
if not isinstance(bias, Tensor):
raise TypeError(f"For 'conv3d', the 'bias' must be a Tensor, but got {type(bias)}.")
conv_result = conv(input, weight)
output = bias_add(conv_result, bias)
return output
@_primexpr
def _check_positive_int(arg_value, arg_name=None, prim_name=None):
validator.check_positive_int(arg_value, arg_name=arg_name, prim_name=prim_name)
@_primexpr
def _check_pxiel_shuffle_valid(num, factor):
if num % factor ** 2 != 0:
raise ValueError("For 'pixel_shuffle', the length of third to last dimension is not divisible"
"by `upscale_factor` squared.")
def _check_pixel_shuffle_unshuffle_input_shape(input, cls_name):
"""Internal function, used to check whether the shape of pixel shuffle or unshuffle input meets the requirements."""
if input.ndim < 3:
raise ValueError(f"For {cls_name}, the dimension of `input` should be larger than 2, but got {input.ndim}.")
[文档]def pixel_shuffle(input, upscale_factor):
r"""
Applies the PixelShuffle operation over input `input` which implements sub-pixel convolutions
with stride :math:`1/r` . For more details, refer to
`Real-Time Single Image and Video Super-Resolution Using an Efficient Sub-Pixel Convolutional Neural Network
<https://arxiv.org/abs/1609.05158>`_ .
Typically, the `input` is of shape :math:`(*, C \times r^2, H, W)` , and the output is of shape
:math:`(*, C, H \times r, W \times r)`, where `r` is an upscale factor and `*` is zero or more batch dimensions.
Args:
input (Tensor): Tensor of shape :math:`(*, C \times r^2, H, W)` . The dimension of `input` is larger than 2,
and the length of third to last dimension can be divisible by `upscale_factor` squared.
upscale_factor (int): factor to shuffle the input Tensor, and is a positive integer.
`upscale_factor` is the above-mentioned :math:`r`.
Returns:
- **output** (Tensor) - Tensor of shape :math:`(*, C, H \times r, W \times r)` .
Raises:
ValueError: If `upscale_factor` is not a positive integer.
ValueError: If the length of third to last dimension is not divisible by `upscale_factor` squared.
ValueError: If the dimension of `input` is less than 3.
TypeError: If `input` is not a Tensor.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import ops
>>> input_x = np.arange(3 * 2 * 9 * 4 * 4).reshape((3, 2, 9, 4, 4))
>>> input_x = mindspore.Tensor(input_x, mindspore.dtype.int32)
>>> output = ops.pixel_shuffle(input_x, 3)
>>> print(output.shape)
(3, 2, 1, 12, 12)
"""
_check_positive_int(upscale_factor, "upscale_factor")
_check_is_tensor("input", input, "pixel_shuffle")
_check_pixel_shuffle_unshuffle_input_shape(input, "pixel_shuffle")
idx = shape_(input)
length = input.ndim
pre = idx[:-3]
c, h, w = idx[-3:]
_check_pxiel_shuffle_valid(c, upscale_factor)
c = c // upscale_factor ** 2
input_perm = (pre + (c, upscale_factor, upscale_factor, h, w))
input = reshape_(input, input_perm)
input_perm = [i for i in range(length - 2)]
input_perm = input_perm + [length, length - 2, length + 1, length - 1]
input_perm = tuple(input_perm)
input = transpose_(input, input_perm)
input = reshape_(input, (pre + (c, upscale_factor * h, upscale_factor * w)))
return input
@_primexpr
def _check_pxiel_unshuffle_valid(num1, num2, factor):
if num1 % factor != 0 or num2 % factor != 0:
raise ValueError("For 'pixel_unshuffle', the length of second to last 2 dimension should be divisible "
"by downscale_factor.")
[文档]def pixel_unshuffle(input, downscale_factor):
r"""
Applies the PixelUnshuffle operation over input `input` which is the inverse of PixelShuffle. For more details,
refer to `Real-Time Single Image and Video Super-Resolution Using an Efficient Sub-Pixel Convolutional Neural
Network <https://arxiv.org/abs/1609.05158>`_ .
Typically, the input is of shape :math:`(*, C, H \times r, W \times r)` , and the output is of shape
:math:`(*, C \times r^2, H, W)` , where `r` is a downscale factor and `*` is zero or more batch dimensions.
Args:
input (Tensor): Tensor of shape :math:`(*, C, H \times r, W \times r)` . The dimension of `input` is larger than
2, and the length of second to last dimension or last dimension can be divisible by `downscale_factor` .
downscale_factor (int): factor to unshuffle the input Tensor, and is a positive integer.
`downscale_factor` is the above-mentioned :math:`r`.
Returns:
- **output** (Tensor) - Tensor of shape :math:`(*, C \times r^2, H, W)` .
Raises:
ValueError: If `downscale_factor` is not a positive integer.
ValueError: If the length of second to last dimension or last dimension is not divisible by `downscale_factor` .
ValueError: If the dimension of `input` is less than 3.
TypeError: If `input` is not a Tensor.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> input_x = np.arange(8 * 8).reshape((1, 1, 8, 8))
>>> input_x = mindspore.Tensor(input_x, mindspore.dtype.int32)
>>> output = ops.pixel_unshuffle(input_x, 2)
>>> print(output.shape)
(1, 4, 4, 4)
"""
_check_positive_int(downscale_factor, "downscale_factor")
_check_is_tensor("input", input, "pixel_unshuffle")
_check_pixel_shuffle_unshuffle_input_shape(input, "pixel_unshuffle")
idx = shape_(input)
length = input.ndim
pre = idx[:-3]
c, h, w = idx[-3:]
_check_pxiel_unshuffle_valid(h, w, downscale_factor)
h = h // downscale_factor
w = w // downscale_factor
input_perm = (pre + (c, h, downscale_factor, w, downscale_factor))
input = reshape_(input, input_perm)
input_perm = [i for i in range(length - 2)]
input_perm = input_perm + [length - 1, length + 1, length - 2, length]
input_perm = tuple(input_perm)
input = transpose_(input, input_perm)
input = reshape_(input, (pre + (c * downscale_factor * downscale_factor, h, w)))
return input
[文档]def glu(x, axis=-1):
r"""
Computes GLU (Gated Linear Unit activation function) of input tensors.
.. math::
{GLU}(a, b)= a \otimes \sigma(b)
where :math:`a` is the first half of the input matrices and :math:`b` is the second half.
Here :math:`\sigma` is the sigmoid function, and :math:`\otimes` is the Hadamard product.
See `Language Modeling with Gated Convluational Networks <https://arxiv.org/abs/1612.08083>`_.
Args:
x (Tensor): Tensor to be split. Its dtype is Number, and shape is :math:`(\ast_1, N, \ast_2)`
where `*` means, any number of additional dimensions.
axis (int, optional): the axis to split the input. It must be int. Default: ``-1`` , the last axis of `x`.
Returns:
Tensor, the same dtype as the `x`, with the shape :math:`(\ast_1, M, \ast_2)` where :math:`M=N/2`.
Raises:
TypeError: If dtype of `x` is not Number.
TypeError: If `x` is not a Tensor.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> from mindspore import Tensor, ops
>>> input = Tensor([[0.1,0.2,0.3,0.4],[0.5,0.6,0.7,0.8]])
>>> output = ops.glu(input)
>>> print(output)
[[0.05744425 0.11973753]
[0.33409387 0.41398472]]
"""
spilt = _get_cache_prim(P.Split)(axis=axis, output_num=2)
x, y = spilt(x)
y = sigmoid_(y)
return x * y
[文档]def multi_margin_loss(input, target, p=1, margin=1, weight=None, reduction='mean'):
r"""
Hinge loss for optimizing a multi-class classification.
Optimizes a multi-class classification hinge
loss (margin-based loss) between input and
output.
For each mini-batch sample, the loss in terms of the 1D input :math:`x` and scalar output :math:`y` is:
.. math::
\text{loss}(x, y) = \frac{\sum_i \max(0, \text{margin} - x[y] + x[i])^p}{\text{x.size}(0)}
where :math:`i\in \{0,⋯,x.size(0)-1\}` and :math:`i \ne y`.
Args:
input (Tensor): Input , with shape :math:`(N, C)`. Data type only support float32, float16 or float64.
It is :math:`x` in the above formula.
target (Tensor): Ground truth labels, with shape :math:`(N,)`. Data type only support int64. The
value of target should be non-negative, less than C. It is :math:`y` in the above formula.
p (int, optional): The norm degree for pairwise distance. Should be 1 or 2. Default: ``1`` .
margin (int, optional): A parameter to change pairwise distance. Default: ``1`` .
weight (Tensor, optional): The rescaling weight to each class with shape :math:`(C,)`. Data type only
support float16, float32 or float64. Default: ``None`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the weighted mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
- **outputs** - Tensor. If `reduction` is ``'none'``, returns a Tensor with the same shape as `target`.
Otherwise, it is a scalar.
Raises:
TypeError: If dtype of `p` or `target` is not int.
TypeError: If dtype of `margin` is not int.
TypeError: If dtype of `reduction` is not str.
TypeError: If dtype of `input` is not float16, float or float64.
TypeError: If dtype of `weight` and `input` is not the same.
ValueError: If `p` is not 1 or 2.
ValueError: If `reduction` is not one of {'none','sum','mean'}.
ValueError: If shape[0] of `input` is not equal to shape[0] of `target`.
ValueError: If shape[1] of `input` is not equal to shape[0] of `weight`.
ValueError: If rank of `weight` is not 1 or rank of `target` is not 1 or `input` is not 2.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> inputs = Tensor(np.ones(shape=[3, 3]), mindspore.float32)
>>> target = Tensor(np.array([1, 2, 1]), mindspore.int64)
>>> weight = Tensor(np.array([1, 1, 1]), mindspore.float32)
>>> output = ops.multi_margin_loss(inputs, target, weight=weight)
>>> print(output)
0.6666667
"""
if not isinstance(margin, int):
raise TypeError(f"For 'multi_margin_loss', the type of 'margin' must be int, but got {type(margin)}.")
margin_ = float(margin)
loss = _get_cache_prim(P.MultiMarginLoss)(p, margin_, reduction)
outputs = loss(input, target, weight)
return outputs
[文档]def multilabel_margin_loss(input, target, reduction='mean'):
r"""
Hinge loss for optimizing a multi-label classification.
Creates a criterion that optimizes a multi-label multi-classification
hinge loss (margin-based loss) between input :math:`x` (a 2D mini-batch `Tensor`)
and output :math:`y` (which is a 2D `Tensor` of target class indices).
For each sample in the mini-batch:
.. math::
\text{loss}(x, y) = \sum_{ij}\frac{\max(0, 1 - (x[y[j]] - x[i]))}{\text{x.size}(0)}
where :math:`x \in \left\{0, \; \cdots , \; \text{x.size}(0) - 1\right\}`, \
:math:`y \in \left\{0, \; \cdots , \; \text{y.size}(0) - 1\right\}`, \
:math:`0 \leq y[j] \leq \text{x.size}(0)-1`, \
and :math:`i \neq y[j]` for all :math:`i` and :math:`j`.
:math:`y` and :math:`x` must have the same size.
The criterion only considers a contiguous block of non-negative targets that
starts at the front.
This allows for different samples to have variable amounts of target classes.
Args:
input (Tensor): Predict data, :math:`x` in the formula above. Tensor of shape :math:`(C)`
or :math:`(N, C)`, where :math:`N` is the batch size and :math:`C` is the number of classes.
Data type must be float16 or float32.
target (Tensor): Ground truth data, :math:`y` in the formula above, with the same shape as `input`,
data type must be int32 and label targets padded by -1.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
- **outputs** (Union[Tensor, Scalar]) - The loss of MultilabelMarginLoss.
If `reduction` is ``"none"``, its shape is :math:`(N)`.
Otherwise, a scalar value will be returned.
Raises:
TypeError: If `input` or `target` is not a Tensor.
TypeError: If dtype of `input` is neither float16 nor float32.
TypeError: If dtype of `target` is not int32.
ValueError: If length of shape of `input` is neither 1 nor 2.
ValueError: If shape of `input` is not the same as `target`.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'``, ``'sum'``.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> inputs = Tensor(np.array([[0.1, 0.2, 0.4, 0.8], [0.2, 0.3, 0.5, 0.7]]), mindspore.float32)
>>> target = Tensor(np.array([[1, 2, 0, 3], [2, 3, -1, 1]]), mindspore.int32)
>>> output = ops.multilabel_margin_loss(inputs, target)
>>> print(output)
0.325
"""
loss = _get_cache_prim(P.MultilabelMarginLoss)(reduction)
outputs, _ = loss(input, target)
return outputs
[文档]def multilabel_soft_margin_loss(input, target, weight=None, reduction='mean'):
r"""
Calculates the MultiLabelSoftMarginLoss.
The multi-label soft margin loss is a commonly used loss function in multi-label classification tasks
where an input sample can belong to multiple classes.
Given an input :math:`input` and binary labels :math:`output` of size :math:`(N,C)`,
where :math:`N` denotes the number of samples
and :math:`C` denotes the number of classes.
.. math::
\mathcal{loss\left( input , output \right)} = - \frac{1}{N}\frac{1}{C}\sum_{i = 1}^{N}
\sum_{j = 1}^{C}\left(output_{ij}\log\frac{1}{1 + e^{- input_{ij}}} + \left( 1 - output_{ij}
\right)\log\frac{e^{-input_{ij}}}{1 + e^{-input_{ij}}} \right)
where :math:`input_{ij}` represents the predicted score of sample :math:`i` for class :math:`j`.
:math:`output_{ij}` represents the binary label of sample :math:`i` for class :math:`j`, where
sample :math:`i` belongs to class :math:`j` if :math:`output_{ij}=1` , and sample :math:`i` does
not belong to class :math:`j` if :math:`output_{ij}=0`. For a multi-label classification task, each
sample may have multiple labels with a value of 1 in the binary label :math:`output`. `weight` will
multiply to the loss of each class if given.
Args:
input (Tensor): A tensor of shape :math:`(N, C)` , where N is batch size and C is number of classes.
target (Tensor): The label target Tensor which has the same shape as `input`.
weight (Union[Tensor, int, float]): The manual rescaling weight given to each class. Default: ``None``.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the weighted mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor, the data type is the same as input, if the `reduction` is ``'none'``,
its shape is :math:`(N)` , otherwise it is zero.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> from mindspore import Tensor, ops
>>> input = Tensor([[0.3, 0.6, 0.6], [0.9, 0.4, 0.2]])
>>> target = Tensor([[0.0, 0.0, 1.0], [0.0, 0.0, 1.0]])
>>> loss = ops.multilabel_soft_margin_loss(input, target, reduction='mean')
>>> print(loss.asnumpy())
0.84693956
"""
cls_name = "multilabel_soft_margin_loss"
_check_is_tensor('input', input, cls_name)
_check_is_tensor('target', target, cls_name)
input_shape = input.shape
if ops.is_sequence_value_unknown(input_shape):
input_shape = tensor_shape_(input)
pos = log_(add_(exp_(-input), 1))
neg = log_(add_(exp_(input), 1))
loss = mul_(target, pos) + mul_(1 - target, neg)
if weight is not None:
loss = mul_(loss, weight)
class_dim = input.ndim - 1
loss = loss.sum(axis=class_dim) / input_shape[class_dim]
return _get_loss(loss, reduction, cls_name)
[文档]def gelu(input, approximate='none'):
r"""
Gaussian Error Linear Units activation function.
GeLU is described in the paper `Gaussian Error Linear Units (GELUs) <https://arxiv.org/abs/1606.08415>`_.
And also please refer to `BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding
<https://arxiv.org/abs/1810.04805>`_.
When `approximate` argument is `none`, GeLU is defined as follows:
.. math::
GELU(x_i) = x_i*P(X < x_i),
where :math:`P` is the cumulative distribution function of the standard Gaussian distribution,
:math:`x_i` is the input element.
When `approximate` argument is `tanh`, GeLU is estimated with:
.. math::
GELU(x_i) = 0.5 * x_i * (1 + \tanh(\sqrt(2 / \pi) * (x_i + 0.044715 * x_i^3)))
GELU Activation Function Graph:
.. image:: ../images/GELU.png
:align: center
Args:
input (Tensor): The input of the activation function GeLU, the data type is float16, float32 or float64.
approximate (str): the gelu approximation algorithm to use. Acceptable vaslues are ``'none'`` and ``'tanh'`` .
Default: ``'none'`` .
Returns:
Tensor, with the same type and shape as `input`.
Raises:
TypeError: If `input` is not a Tensor.
TypeError: If dtype of `input` is not bfloat16, float16, float32 or float64.
ValueError: If `approximate` value is neither `none` nor `tanh`.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import Tensor, ops
>>> x = Tensor([1.0, 2.0, 3.0], mindspore.float32)
>>> result = ops.gelu(x)
>>> print(result)
[0.8413447 1.9544997 2.9959505]
"""
if approximate not in ['none', 'tanh']:
raise ValueError("For ops.gelu, approximate value should be either 'none' or 'tanh'.")
x_dtype = dtype_(input)
if x_dtype not in [mstype.float16, mstype.float32, mstype.float64, mstype.bfloat16]:
raise TypeError(f"For gelu, the input dtype must be float16, float32 or float64, "
f"but got {x_dtype}.")
if approximate == 'tanh':
output = gelu_(input)
else:
output = sqrt_(Tensor(2.0, x_dtype))
output = div_(input, output)
output = erf_(output) + Tensor(1.0, x_dtype)
output = input * output * Tensor(0.5, x_dtype)
return output
[文档]def channel_shuffle(x, groups):
r"""
Divide the channels in a tensor of shape :math:`(*, C, H, W)` into :math:`g` groups and
rearrange them as :math:`(*, \frac{C}{g}, g, H*W)`, while keeping the original tensor shapes.
Args:
x (Tensor): Tensor to be divided, it has shape :math:`(*, C, H, W)`,
with float16, float32, int8, int16, int32, int64, uint8, uint16, uint32, uint64 data type.
groups (int): Number of groups to divide channels in.
Returns:
A Tensor, has the same type as the `x`, and has the shape :math:`(*, C, H, W)`.
Raises:
TypeError: If data type of `x` is not one of the following:
float16, float32, int8, int16, int32, int64, uint8, uint16, uint32, uint64.
TypeError: If dim of `x` is < 4.
TypeError: If `groups` is not a positive number.
ValueError: If channel number of `x` is not divisible by `groups`.
Supported Platforms:
``Ascend`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> group = 2
>>> x = Tensor(np.arange(1* 4 * 2 * 2).reshape(1, 4, 2, 2).astype(np.int16))
>>> y = mindspore.ops.channel_shuffle(x, group)
>>> print(y)
[[[[ 0 1]
[ 2 3]]
[[ 8 9]
[10 11]]
[[ 4 5]
[ 6 7]]
[[12 13]
[14 15]]]]
"""
channel_shuffle_func = ChannelShuffle(group=groups)
y = channel_shuffle_func(x)
return y
[文档]def lp_pool1d(x, norm_type, kernel_size, stride=None, ceil_mode=False):
r"""
Applying 1D LPPooling operation on an input Tensor can be regarded as forming a 1D input plane.
Typically the input is of shape :math:`(N, C, L_{in})` or :math:`(C, L_{in})`, the output is of shape
:math:`(N, C, L_{out})` or :math:`(C, L_{out})`.
.. math::
L_{out} = \left\lfloor\frac{L_{in} - \text{kernel_size}}{\text{stride}} + 1\right\rfloor
The operation is as follows.
.. math::
f(X) = \sqrt[p]{\sum_{x \in X} x^{p}}
Args:
x (Tensor): Tensor of shape :math:`(N, C, L_{in})` or :math:`(C, L_{in})`.
norm_type (Union[int, float]): Type of normalization, represents p in the formula, can not be 0,
- if p = 1, the result obtained is the sum of elements in the pool nucleus(Proportional to average pooling).
- if p = :math:`\infty`, the result is the result of maximum pooling.
kernel_size (int): The size of kernel window.
stride (int): The distance of kernel moving, an int number that represents
the width of movement is stride. Default: ``None`` , which indicates the moving step is `kernel_size` .
ceil_mode (bool): Whether to use ceil or floor to calculate output shape. Default: ``False`` .
Returns:
- **output** (Tensor) - LPPool1d result, with shape :math:`(N, C, L_{out})` or :math:`(C, L_{out})`,
It has the same data type as `x`, where
.. math::
L_{out} = \left\lfloor\frac{L_{in} - \text{kernel_size}}{\text{stride}} + 1\right\rfloor
Raises:
TypeError: If `x` is not a Tensor.
TypeError: If `kernel_size` or `stride` is not an int.
TypeError: If `ceil_mode` is not a bool.
TypeError: If `norm_type` is neither float nor int.
ValueError: If `norm_type` is equal to 0.
ValueError: If `kernel_size` or `stride` is less than 1.
ValueError: If length of shape of `x` is not equal to 2 or 3.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> from mindspore import Tensor
>>> import numpy as np
>>> x = Tensor(np.arange(2 * 3 * 4).reshape((2, 3, 4)), dtype=ms.float32)
>>> out = ops.lp_pool1d(x, norm_type=1, kernel_size=3, stride=1, ceil_mode=False)
>>> print(out)
[[[ 3. 6.]
[15. 18.]
[27. 30.]]
[[39. 42.]
[51. 54.]
[63. 66.]]]
"""
if isinstance(norm_type, (float, int)):
norm_type = float(norm_type)
else:
raise TypeError(f"For lp_pool1d, the type of 'norm_type' must be float or int, but got {type(norm_type)}")
if norm_type == 0:
raise ValueError(f"For lp_pool1d, the value of 'norm_type' can not be 0.")
sign = _get_cache_prim(ops.Sign)()
squeeze = _get_cache_prim(ops.Squeeze)(0)
expand_dims = _get_cache_prim(ops.ExpandDims)()
_is_squeeze = False
if len(x.shape) == 2:
x = expand_dims(x, 0)
_is_squeeze = True
if stride is None:
stride = kernel_size
out = ops.avg_pool1d(x.pow(norm_type), kernel_size=kernel_size, stride=stride, padding=0, ceil_mode=ceil_mode)
if _is_squeeze:
out = squeeze(out)
return ((sign(out) * ops.relu(ops.abs(out))) * kernel_size).pow(1.0 / norm_type)
[文档]def lp_pool2d(x, norm_type, kernel_size, stride=None, ceil_mode=False):
r"""
Applying 2D LPPooling operation on an input Tensor can be regarded as forming a 2D input plane.
Typically the input is of shape :math:`(N, C, H_{in}, W_{in})`, the output is of shape
:math:`(N, C, H_{in}, W_{in})`, with the same shape as input, the operation is as follows.
.. math::
f(X) = \sqrt[p]{\sum_{x \in X} x^{p}}
Args:
x (Tensor): Tensor of shape :math:`(N, C, H_{in}, W_{in})`.
norm_type (Union[int, float]): Type of normalization, represents p in the formula, can not be 0,
- if p = 1, the result obtained is the sum of elements in the pool nucleus(Proportional to average pooling).
- if p = :math:`\infty`, the result is the result of maximum pooling.
kernel_size (Union[int, tuple[int]]): The size of kernel window.
The data type of kernel_size must be int and the value represents the height and width,
or a tuple of two int numbers that represent height and width respectively.
stride (Union[int, tuple[int]]): The distance of kernel moving, an int number that represents
the height and width of movement are both strides, or a tuple of two int numbers that
represent height and width of movement respectively.
Default: ``None`` , which indicates the moving step is `kernel_size` .
ceil_mode (bool): Whether to use ceil or floor to calculate output shape. Default: ``False`` .
Returns:
- **output** (Tensor) - LPPool2d result, with shape :math:`(N, C, H_{in}, W_{in})`,
It has the same data type as `x`, where
.. math::
H_{out} = \left\lfloor\frac{H_{in} - \text{kernel_size}[0]}{\text{stride}[0]} + 1\right\rfloor
.. math::
W_{out} = \left\lfloor\frac{W_{in} - \text{kernel_size}[1]}{\text{stride}[1]} + 1\right\rfloor
Raises:
TypeError: If `x` is not a Tensor.
TypeError: If `kernel_size` or `stride` is neither int nor tuple.
TypeError: If `ceil_mode` is not a bool.
TypeError: If `norm_type` is neither float nor int.
ValueError: If `norm_type` is equal to 0.
ValueError: If `kernel_size` or `stride` is less than 1.
ValueError: If `kernel_size` or `stride` is a tuple whose length is not equal to `2`.
ValueError: If length of shape of `x` is not equal to 4.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> from mindspore import Tensor
>>> import numpy as np
>>> x = Tensor(np.arange(2 * 3 * 4 * 5).reshape((2, 3, 4, 5)), dtype=ms.float32)
>>> out = ops.lp_pool2d(x, norm_type=1, kernel_size=3, stride=1, ceil_mode=False)
>>> print(out)
[[[[ 54. 63. 72.]
[ 99. 108. 117.]]
[[ 234. 243. 252.]
[ 279. 288. 297.]]
[[ 414. 423. 432.]
[ 459. 468. 477.]]]
[[[ 594. 603. 612.]
[ 639. 648. 657.]]
[[ 774. 783. 792.]
[ 819. 828. 837.]]
[[ 954. 963. 972.]
[ 999. 1008. 1017.]]]]
"""
if isinstance(norm_type, (float, int)):
norm_type = float(norm_type)
else:
raise TypeError(f"For lp_pool2d, the type of 'norm_type' must be float or int, but got {type(norm_type)}")
if norm_type == 0:
raise ValueError(f"For lp_pool2d, the value of 'norm_type' can not be 0.")
sign = _get_cache_prim(ops.Sign)()
if not isinstance(kernel_size, tuple):
kernel_size = (kernel_size, kernel_size)
if stride is None:
stride = kernel_size
out = ops.avg_pool2d(x.pow(norm_type), kernel_size=kernel_size, stride=stride, padding=0, ceil_mode=ceil_mode)
return ((sign(out) * ops.relu(ops.abs(out))) * (kernel_size[0] * kernel_size[1])).pow(1.0 / norm_type)
[文档]def mse_loss(input, target, reduction='mean'):
r"""
Calculates the mean squared error between the predicted value and the label value.
For detailed information, please refer to :class:`mindspore.nn.MSELoss`.
Args:
input (Tensor): Tensor of any dimension.
target (Tensor): The input label. Tensor of any dimension, same shape as the `input` in common cases.
However, it supports that the shape of `input` is different from the shape of `target`
and they should be broadcasted to each other.
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor, loss of type float, the shape is zero if `reduction` is ``'mean'`` or ``'sum'`` ,
while the shape of output is the broadcasted shape if `reduction` is ``'none'`` .
Raises:
ValueError: If `reduction` is not one of ``'none'`` , ``'mean'`` or ``'sum'``.
ValueError: If `input` and `target` have different shapes and cannot be broadcasted.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> logits = Tensor(np.array([1, 2, 3]), mindspore.float32)
>>> labels = Tensor(np.array([[1, 1, 1], [1, 2, 2]]), mindspore.float32)
>>> output = ops.mse_loss(logits, labels, reduction='none')
>>> print(output)
[[0. 1. 4.]
[0. 0. 1.]]
"""
if not isinstance(input, (Tensor, Tensor_)):
raise TypeError("For ops.mse_loss, the `input` must be tensor")
if not isinstance(target, (Tensor, Tensor_)):
raise TypeError("For ops.mse_loss, the `target` must be tensor")
if reduction not in ['mean', 'none', 'sum']:
raise ValueError("For ops.mse_loss, `reduction` value should be either 'mean', 'none' or 'sum'.")
x = square_(input - target)
float_type = (mstype.float16, mstype.float32, mstype.float64)
if x.dtype not in float_type:
input_dtype = mstype.float32
else:
input_dtype = x.dtype
x = cast_(x, mstype.float32)
average_flag = True
reduce_flag = True
if reduction == 'sum':
average_flag = False
if reduction == 'none':
reduce_flag = False
if reduce_flag and average_flag:
x = reduce_mean_(x, _get_axis(x))
if reduce_flag and not average_flag:
x = reduce_sum_(x, _get_axis(x))
return cast_(x, input_dtype)
[文档]def msort(input):
r"""
Sorts the elements in Tensor in ascending order of value along its first dimension.
ops.msort(t) is equivalent to ops.Sort(axis=0)(t)[0]. See also :class:`mindspore.ops.Sort()`.
Args:
input (Tensor): The input to sort, with float16 or float32 data type.
Returns:
A tensor whose values are the sorted values, with the same shape and data type as input.
Raises:
TypeError: If dtype of `input` is neither float16 nor float32.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore as ms
>>> from mindspore import ops
>>> import numpy as np
>>> input = ms.Tensor(np.array([[8, 2, 1], [5, 9, 3], [4, 6, 7]]), ms.float16)
>>> output = ops.msort(input)
>>> print(output)
[[4. 2. 1.]
[5. 6. 3.]
[8. 9. 7.]]
"""
return ops.Sort(axis=0)(input)[0]
[文档]def triplet_margin_loss(anchor, positive, negative, margin=1.0, p=2, eps=1e-06, swap=False, reduction='mean'):
"""
TripletMarginLoss operation.
See :class:`mindspore.nn.TripletMarginLoss` for details.
Args:
anchor (Tensor): A sample randomly selected from the training set. Data type must be BasicType.
positive (Tensor): A sample belonging to the same category as `anchor`, with the same type and shape
as `anchor`.
negative (Tensor): A sample belonging to the different class from `anchor`, with the same type and shape
as `anchor`.
margin (float, optional): Make a margin between the positive pair and the negative pair. Default: ``1.0`` .
p (int, optional): The degree of norm for pairwise distance. Default: ``2`` .
eps (float, optional): Add small value to avoid division by zero. Default: ``1e-06``.
swap (bool, optional): The distance swap change the negative distance to the distance between positive
sample and negative sample. Default: ``False`` .
reduction (str, optional): Apply specific reduction method to the output: ``'none'`` , ``'mean'`` ,
``'sum'`` . Default: ``'mean'`` .
- ``'none'``: no reduction will be applied.
- ``'mean'``: compute and return the mean of elements in the output.
- ``'sum'``: the output elements will be summed.
Returns:
Tensor. If `reduction` is ``"none"``, its shape is :math:`(N)`. Otherwise, a scalar value will be returned.
Raises:
TypeError: If `anchor` or `positive` or `negative` is not a Tensor.
TypeError: If dtype of `anchor`, `positive` and `negative` is not the same.
TypeError: If `margin` is not a float.
TypeError: If `p` is not an int.
TypeError: If `eps` is not a float.
TypeError: If `swap` is not a bool.
ValueError: If dimensions of input `anchor`, `positive` and `negative` are less than or equal to 1 at the
same time.
ValueError: If the dimension of input `anchor` or `positive` or `negative` is bigger than or equal to 8.
ValueError: If shape of `anchor`, `positive` and `negative` cannot broadcast.
ValueError: If `reduction` is not one of ``'none'``, ``'mean'``, ``'sum'``.
Supported Platforms:
``GPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> anchor = Tensor(np.array([[0.3, 0.7], [0.5, 0.5]]), mindspore.float32)
>>> positive = Tensor(np.array([[0.4, 0.6], [0.4, 0.6]]), mindspore.float32)
>>> negative = Tensor(np.array([[0.2, 0.9], [0.3, 0.7]]), mindspore.float32)
>>> output = ops.triplet_margin_loss(anchor, positive, negative)
>>> print(output)
0.8881968
"""
if not isinstance(margin, Tensor):
margin_tensor = Tensor(margin, mstype.float32)
else:
margin_tensor = margin
triplet_margin_loss_op = _get_cache_prim(TripletMarginLoss)(p=p, eps=eps, swap=swap, reduction=reduction)
return triplet_margin_loss_op(anchor, positive, negative, margin_tensor)
def linear(x, w, b):
"""inner linear"""
out = ops.matmul(x, w.swapaxes(-1, -2))
if b is not None:
out = out + b
return out
def _inner_dropout(x, p, training):
"""inner dropout"""
_dropout = _get_cache_prim(P.Dropout)(1 - p)
if 0. < p <= 1. and training:
return _dropout(x)[0]
return x
def _in_projection(q, k, v, w_q, w_k, w_v, b_q=None, b_k=None, b_v=None):
"""in projection function"""
Eq, Ek, Ev = q.shape[-1], k.shape[-1], v.shape[-1]
w_q_shape, w_k_shape, w_v_shape = w_q.shape, w_k.shape, w_v.shape
if w_q_shape != (Eq, Eq):
raise ValueError(f"Expecting query weights shape of {(Eq, Eq)}, but got {w_q_shape}")
if w_k_shape != (Eq, Ek):
raise ValueError(f"Expecting key weights shape of {(Eq, Ek)}, but got {w_k_shape}")
if w_v_shape != (Eq, Ev):
raise ValueError(f"Expecting value weights shape of {(Eq, Ev)}, but got {w_v_shape}")
if b_q is not None:
b_q_shape = b_q.shape
if b_q_shape != (Eq,):
raise ValueError(f"Expecting query bias shape of {(Eq,)}, but got {b_q_shape}")
if b_k is not None:
b_k_shape = b_k.shape
if b_k_shape != (Eq,):
raise ValueError(f"Expecting key bias shape of {(Eq,)}, but got {b_k_shape}")
if b_v is not None:
b_v_shape = b_v.shape
if b_v_shape != (Eq,):
raise ValueError(f"Expecting value bias shape of {(Eq,)}, but got {b_v_shape}")
return linear(q, w_q, b_q), linear(k, w_k, b_k), linear(v, w_v, b_v)
def _in_projection_packed(q, k, v, w, b, k_is_v, q_is_k):
"""in projecktion packed function"""
E = q.shape[-1]
if k_is_v:
if q_is_k:
# self-attention
return linear(q, w, b).tensor_split(3, axis=-1)
# encoder-decoder attention
w_q, w_kv = w.split([E, E * 2])
if b is None:
b_q = b_kv = None
else:
b_q, b_kv = b.split([E, E * 2])
return (linear(q, w_q, b_q),) + linear(k, w_kv, b_kv).tensor_split(2, axis=-1)
w_q, w_k, w_v = w.tensor_split(3)
if b is None:
b_q = b_k = b_v = None
else:
b_q, b_k, b_v = b.tensor_split(3)
return linear(q, w_q, b_q), linear(k, w_k, b_k), linear(v, w_v, b_v)
def _scaled_dot_product_attention(query, key, value, attn_mask, dropout_p, is_causal, is_training, dtype):
"""scaled dot product attention"""
embed_size = query.shape[-1]
embed_size_tensor = scalar_to_tensor_(embed_size, dtype)
scaling_factor = embed_size_tensor.sqrt().sqrt()
query = query / scaling_factor
if is_causal:
L = query.shape[-2]
S = key.shape[-2]
attn_mask = ops.ones((L, S), mstype.bool_).tril()
attn = ops.matmul(query, key.swapaxes(-2, -1) / scaling_factor)
if attn_mask is not None:
attn = attn + attn_mask
attn = ops.softmax(attn, -1)
attn = _inner_dropout(attn, dropout_p, is_training)
output = ops.matmul(attn, value)
return (output, attn)
@_primexpr
def _check_qkv_shape(query_ndim, key_ndim, value_ndim):
"""Check the expected shape for `query, `key`, `value` and returns whether the input is batched."""
# Shape check.
if query_ndim == 3:
# Batched Inputs
is_batched = True
if key_ndim != 3 or value_ndim != 3:
raise ValueError(f"For batched `query`, the `key` and `value` must be 3D tensor, "
f"but got `key` with {key_ndim}D and `value` with {value_ndim}D.")
elif query_ndim == 2:
# Unbatched Inputs
is_batched = False
if key_ndim != 2 or value_ndim != 2:
raise ValueError(f"For unbatched `query`, the `key` and `value` must be 2D tensor, "
f"but got `key` with {key_ndim}D and `value` with {value_ndim}D.")
else:
raise ValueError(f"The `query` should be unbatched 2D or batched 3D tensor, "
f"but got `query` with {query_ndim}D.")
return is_batched
@_primexpr
def _check_kpm_shape(query_ndim, kmp_ndim):
"""check key_padding_mask shape"""
if query_ndim == 3:
if kmp_ndim != 2:
raise ValueError(f"For batched `query`, the `key_padding_mask` must be `None` or 2D, "
f"but got `key_padding_mask` with {kmp_ndim}D.")
elif query_ndim == 2:
if kmp_ndim != 1:
raise ValueError(f"For unbatched `query`, the `key_padding_mask` must be `None` or 1D, "
f"but got `key_padding_mask` with {kmp_ndim}D.")
@_primexpr
def _check_attn_mask_shape(query_ndim, query_shape, key_shape, attn_mask_ndim,
attn_mask_shape, num_heads):
"""
Check the expected shape for `attn_mask`.
"""
# Shape check.
if query_ndim == 3:
if attn_mask_ndim not in (2, 3):
raise ValueError(f"For batched `query`, the `attn_mask` must be `None`, 2-D or 3-D, "
f"but got `attn_mask` with{attn_mask_ndim}D.")
elif query_ndim == 2:
if attn_mask_ndim not in (2, 3):
raise ValueError(f"For unbatched `query`, the `attn_mask` must be `None`, 2-D or 3-D, "
f"but got `attn_mask` with{attn_mask_ndim}D.")
if attn_mask_ndim == 3:
expected_shape = (num_heads, query_shape[0], key_shape[0])
if attn_mask_shape != expected_shape:
raise ValueError(f"The shape of `attn_mask` must to be {expected_shape}, "
f"but got {attn_mask_shape}.")
def _inner_pad(x, padding, value=None):
"""inner pad function for bool type."""
x_dtype = x.dtype
if x_dtype == mstype.bool_:
x = x.astype(mstype.int32)
x = pad(x, padding, value=value)
x = x.astype(x_dtype)
return x
def multi_head_attention_forward(query, key, value, embed_dim_to_check, num_heads, in_proj_weight,
in_proj_bias, bias_k, bias_v, add_zero_attn, dropout_p, out_proj_weight,
out_proj_bias, training=True, key_padding_mask=None, attn_mask=None,
use_separate_proj_weight=False, q_proj_weight=None, k_proj_weight=None,
v_proj_weight=None, static_k=None, static_v=None, average_attn_weights=True,
is_causal=False, k_is_v=False, q_is_k=False, dtype=mstype.float32):
"""multi head attetion forward function"""
is_batched = _check_qkv_shape(query.ndim, key.ndim, value.ndim)
if key_padding_mask is not None:
_check_kpm_shape(query.ndim, key_padding_mask.ndim)
if attn_mask is not None:
_check_attn_mask_shape(query.ndim, query.shape, key.shape, attn_mask.ndim,
attn_mask.shape, num_heads)
if not is_batched:
query = query.expand_dims(1)
key = key.expand_dims(1)
value = value.expand_dims(1)
if key_padding_mask is not None:
key_padding_mask = key_padding_mask.expand_dims(0)
tgt_len, bsz, embed_dim = query.shape
src_len, _, _ = key.shape
if key_padding_mask is not None:
_kpm_dtype = key_padding_mask.dtype
if _kpm_dtype != mstype.bool_ and not ops.is_floating_point(key_padding_mask):
raise ValueError("The `key_padding_mask` only supports bool and floating dtypes.")
if embed_dim != embed_dim_to_check:
raise ValueError(f"The `embed_dim` should be {embed_dim_to_check}, but got {embed_dim}.")
head_dim = embed_dim // num_heads
if head_dim * num_heads != embed_dim:
raise ValueError(f"The `embed_dim` {embed_dim} can not be divisible by `num_heads` {num_heads}.")
if use_separate_proj_weight:
# allow MHA to have different embedding dims when separate projection weights are used
if key.shape[:2] != value.shape[:2]:
raise ValueError(f"The sequence length and batch dims of `key`: {key.shape[:2]} do not match "
f"`value`: {value.shape[:2]}.")
else:
if key.shape != value.shape:
raise ValueError(f"The shape of `key` {key.shape} does not match `value` {value.shape}.")
# compute in-projection
if not use_separate_proj_weight:
if in_proj_weight is None:
raise ValueError("`use_separate_proj_weight` is ``False`` but `in_proj_weight` got ``None``.")
q, k, v = _in_projection_packed(query, key, value, in_proj_weight, in_proj_bias, k_is_v, q_is_k)
else:
if q_proj_weight is None:
raise ValueError("`use_separate_proj_weight` is ``True`` but `q_proj_weight` got ``None``.")
if k_proj_weight is None:
raise ValueError("`use_separate_proj_weight` is ``True`` but `k_proj_weight` got ``None``.")
if v_proj_weight is None:
raise ValueError("`use_separate_proj_weight` is ``True`` but `v_proj_weight` got ``None``.")
if in_proj_bias is None:
b_q = b_k = b_v = None
else:
b_q, b_k, b_v = in_proj_bias.tensor_split(3)
q, k, v = _in_projection(query, key, value, q_proj_weight, k_proj_weight, v_proj_weight, b_q, b_k, b_v)
# prep attention mask
if attn_mask is not None:
if attn_mask.dtype == mstype.uint8:
attn_mask = attn_mask.astype(mstype.bool_)
else:
if not ops.is_floating_point(attn_mask) and attn_mask.dtype != mstype.bool_:
raise ValueError(f"`attn_mask` only support float, byte, and bool types, "
f"but got not {attn_mask.dtype}.")
# ensure attn_mask's ndim is 3
if attn_mask.ndim == 2:
correct_2d_size = (tgt_len, src_len)
if attn_mask.shape != correct_2d_size:
raise ValueError(f"The shape of the `attn_mask` should be {correct_2d_size}, "
f"but got {attn_mask.shape}.")
attn_mask = attn_mask.expand_dims(0)
elif attn_mask.ndim == 3:
correct_3d_size = (bsz * num_heads, tgt_len, src_len)
if attn_mask.shape != correct_3d_size:
raise ValueError(f"The shape of the `attn_mask` should be {correct_3d_size}, "
f"but got {attn_mask.shape}.")
else:
raise ValueError(f"The ndim of `attn_mask` only support 2 or 3, "
f"but got {attn_mask.ndim}.")
if bias_k is not None and bias_v is not None:
if static_k is not None:
raise ValueError("The bias_k cannot be added to static_k.")
if static_v is not None:
raise ValueError("The bias_v cannot be added to static_v.")
k = ops.cat([k, bias_k.tile((1, bsz, 1))])
v = ops.cat([v, bias_v.tile((1, bsz, 1))])
if attn_mask is not None:
attn_mask = _inner_pad(attn_mask, (0, 1))
if key_padding_mask is not None:
key_padding_mask = _inner_pad(key_padding_mask, (0, 1))
else:
if bias_k is not None or bias_v is not None:
raise ValueError("The bias_k and bias_v should be ``None``"
"at the same time.")
q = q.view((tgt_len, bsz * num_heads, head_dim)).swapaxes(0, 1)
if static_k is None:
k = k.view((k.shape[0], bsz * num_heads, head_dim)).swapaxes(0, 1)
else:
if static_k.shape[0] != bsz * num_heads:
raise ValueError(f"The shape[0] of `static_k` should be {bsz * num_heads}, "
f"but got {static_k.shape[0]}")
if static_k.shape[2] != head_dim:
raise ValueError(f"The shape[2] of `static_k` should be {head_dim}, "
f"but got {static_k.shape[2]}")
k = static_k
if static_v is None:
v = v.view((v.shape[0], bsz * num_heads, head_dim)).swapaxes(0, 1)
else:
if static_v.shape[0] != bsz * num_heads:
raise ValueError(f"The shape[0] of `static_v` should be {bsz * num_heads}, "
f"but got {static_v.shape[0]}")
if static_v.shape[2] != head_dim:
raise ValueError(f"The shape[2] of `static_v` should be {head_dim}, "
f"but got {static_v.shape[2]}")
v = static_v
if add_zero_attn:
zero_attn_shape = (bsz * num_heads, 1, head_dim)
k = ops.cat([k, ops.zeros(zero_attn_shape, dtype=k.dtype)], axis=1)
v = ops.cat([v, ops.zeros(zero_attn_shape, dtype=v.dtype)], axis=1)
if attn_mask is not None:
attn_mask = _inner_pad(attn_mask, (0, 1))
if key_padding_mask is not None:
key_padding_mask = _inner_pad(key_padding_mask, (0, 1))
src_len = k.shape[1]
if key_padding_mask is not None:
if key_padding_mask.shape != (bsz, src_len):
raise ValueError(f"The shape of `key_padding_mask` should be {(bsz, src_len)}, "
f"but got {key_padding_mask.shape}.")
key_padding_mask = key_padding_mask.view((bsz, 1, 1, src_len)). \
tile((1, num_heads, 1, 1)).reshape(bsz * num_heads, 1, src_len)
if attn_mask is None:
attn_mask = key_padding_mask
elif attn_mask.dtype == mstype.bool_:
attn_mask = attn_mask.logical_or(key_padding_mask)
else:
attn_mask = attn_mask + key_padding_mask
if attn_mask is not None and attn_mask.dtype == mstype.bool_:
new_attn_mask = ops.zeros_like(attn_mask, dtype=q.dtype)
attn_mask = new_attn_mask.masked_fill(attn_mask, ops.cast(float("-inf"), new_attn_mask.dtype))
if attn_mask is not None:
if attn_mask.shape[0] == 1:
attn_mask = attn_mask.expand_dims(0)
else:
attn_mask = attn_mask.view((bsz, num_heads, -1, src_len))
q = q.view((bsz, num_heads, tgt_len, head_dim))
k = k.view((bsz, num_heads, src_len, head_dim))
v = v.view((bsz, num_heads, src_len, head_dim))
attn_output, attn_output_weights = _scaled_dot_product_attention(
q, k, v, attn_mask, dropout_p, is_causal, training, dtype)
attn_output = attn_output.transpose(2, 0, 1, 3).view((bsz * tgt_len, embed_dim))
attn_output = linear(attn_output, out_proj_weight, out_proj_bias)
attn_output = attn_output.view((tgt_len, bsz, attn_output.shape[1]))
attn_output_weights = attn_output_weights.view((bsz, num_heads, tgt_len, src_len))
if average_attn_weights:
attn_output_weights = attn_output_weights.sum(axis=1) / num_heads
if not is_batched:
attn_output = attn_output.squeeze(1)
attn_output_weights = attn_output_weights.squeeze(0)
return attn_output, attn_output_weights
[文档]def max_pool2d(x, kernel_size, stride=None, padding=0, dilation=1, return_indices=False, ceil_mode=False):
r"""
Performs a 2D max pooling on the input Tensor.
Typically, the input is a Tensor with shape :math:`(N_{in}, C_{in}, H_{in}, W_{in})`, outputs
regional maximum in the :math:`(H_{in}, W_{in})`-dimension. Given `kernel_size`
:math:`ks = (h_{ker}, w_{ker})` and `stride` :math:`s = (s_0, s_1)`, the operation is as follows:
.. math::
\text{output}(N_i, C_j, h, w) =
\max_{m=0, \ldots, h_{ker}-1} \max_{n=0, \ldots, w_{ker}-1}
\text{input}(N_i, C_j, s_0 \times h + m, s_1 \times w + n)
Args:
x (Tensor): Tensor of shape :math:`(N_{in}, C_{in}, H_{in}, W_{in})` with data type of int8,
int16, int32, int64, uint8, uint16, uint32, uint64, float16, float32 or float64 in CPU or GPU
while that of uint16 in Ascend.
kernel_size (Union[int, tuple[int]]): The size of kernel used to take the maximum value and arg
value, is an int number that represents height and width of the kernel, or a tuple of
two int numbers that represent height and width respectively.
stride (Union[int, tuple[int]]): The distance of kernel moving, an int number that represents
the height and width of movement are both stride, or a tuple of two int numbers that
represent height and width of movement respectively.
Default: ``None`` , which indicates the moving step is `kernel_size` .
padding (Union[int, tuple[int]]): An int number that represents the height and width of movement are both
strides, or a tuple of two int numbers that represent height and width of movement respectively.
Default: ``0`` .
dilation (Union[int, tuple[int]]): Control the stride of elements in the kernel. Default: ``1`` .
return_indices (bool): Whether to output the indices of max value. Default: ``False`` .
ceil_mode (bool): Whether to use ceil instead of floor to calculate output shape. Default: ``False`` .
Returns:
If `return_indices` is ``False`` , return a Tensor `output`, else return a tuple (`output`, `argmax`).
- **output** (Tensor) - Maxpooling result, with shape :math:`(N_{out}, C_{out}, H_{out}, W_{out})`.
It has the same data type as `x`.
.. math::
H_{out} = \left\lfloor\frac{H_{in} + 2 * \text{padding[0]} - \text{dilation[0]}
\times (\text{kernel_size[0]} - 1) - 1}{\text{stride[0]}} + 1\right\rfloor
.. math::
W_{out} = \left\lfloor\frac{W_{in} + 2 * \text{padding[1]} - \text{dilation[1]}
\times (\text{kernel_size[1]} - 1) - 1}{\text{stride[1]}} + 1\right\rfloor
- **argmax** (Tensor) - Index corresponding to the maximum value. In CPU and GPU, data type is int64
while that is uint16 in Ascend. It will be return only when `return_indices` is True.
Raises:
TypeError: If `x` is not a Tensor.
ValueError: If length of shape of `x` is not equal to 4.
TypeError: If `kernel_size` , `stride` , `padding` or `dilation` is not int or tuple.
ValueError: If `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `padding` is more than half of `kernel_size`.
TypeError: If `ceil_mode` is not bool.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.arange(20 * 16 * 50 * 32).reshape((20, 16, 50, 32)), mindspore.float32)
>>> output_tensor, argmax = ops.max_pool2d(x, kernel_size=(3, 2), stride=(2, 1), return_indices=True)
>>> print(output_tensor.shape)
(20, 16, 24, 31)
>>> print(argmax.shape)
(20, 16, 24, 31)
"""
strides = stride if (stride is not None) else kernel_size
max_pool_with_argmax_v2_ = _get_cache_prim(NN_OPS.MaxPoolWithArgmaxV2)(
kernel_size, strides, padding, dilation, ceil_mode)
out, indices = max_pool_with_argmax_v2_(x)
if return_indices:
return out, indices
return out
def prompt_flash_attention(query, key, value, attn_mask, actual_seq_lengths, actual_seq_lengths_kv, pse_shift,
deq_scale1, quant_scale1, deq_scale2, quant_scale2, quant_offset2, num_heads,
scale_value=1.0, pre_tokens=2147483547, next_tokens=0, input_layout='BSH',
num_key_value_heads=0, sparse_mode=0, inner_precise=1):
r"""
The interface for fully inference.
B -- Batch size
S -- Sequence length
H -- Hidden size
Note:
experiment ops
.. warning::
This is an experimental API that is subject to change or deletion.
Inputs:
query (Tensor) - The query tensor with data type of float16 or float32.
Input tensor of shape :math:`(B, S, H)` / `(B, N, S, D)`.
key (Tensor) - The key tensor with data type of float16 or float32.
Input tensor of shape :math:`(B, S, H)` / `(B, N, S, D)`.
value (Tensor) - The value tensor with data type of float16 or float32.
Input tensor of shape :math:`(B, S, H)` / `(B, N, S, D)`.
attn_mask (Tensor) - The attention mask tensor with data type of float16 or float32.
For each element, 0 indicates retention and 1 indicates discard. Input tensor of shape :math:`(B, 1, S, S)`.
actual_seq_lengths (Tensor): Describe actual sequence length of each input with data type of int64.
actual_seq_lengths_kv (Tensor): Describe actual sequence length of each input with data type of int64.
pse_shift (Tensor) - The position encoding tensor with data type of float16 or float32.
dep_scale1 (Tensor)
quant_scale1 (Tensor)
deq_scale2 (Tensor)
quant_scale2 (Tensor)
quant_offset2 (Tensor)
num_heads (int): The number of heads.
scale_value (float): The scale value indicating the scale coefficient, which is used as the scalar of
Muls in the calculation. Default: 1.0.
pre_tokens (int): Previous tokens. Default: 2147483547.
next_tokens (int): next tokens. Default: 0.
indicate the upper triangle, Indicate the number of data blocks involved in the calculation. The value 0
indicates that the data blocks in the upper triangle are not involved in the calculation
input_layout (str): the data layout of the input qkv, support `(BSH)` and `(BNSD)`, Default `BSH`.
num_key_value_heads (int): head numbers of key/value which are used in GQA algorithm.
The value o indicates if the key and value have the same head nums, use numHeads. Default: 0.
sparse_mode (int): Default: 0
inner_precise (int): 0, float16 high precision. 1, high performance. default 1
Outputs:
attention_out (Tensor) - Input tensor of shape :math:`(B, S, H)` / `(B, N, S, D)`.
Supported Platforms:
``Ascend``
Examples:
>>> from mindspore.ops.function.nn_func import prompt_flash_attention
>>> from mindspore import Tensor
>>> import numpy as np
>>> B = 1
>>> N = 16
>>> S = 256
>>> D = 16
>>> query = Tensor(np.ones((B, N, S, D), dtype=np.float16))
>>> key = Tensor(np.ones((B, N, S, D), dtype=np.float16))
>>> value = Tensor(np.ones((B, N, S, D), dtype=np.float16))
>>> out = ops.prompt_flash_attention(query, key, value, None, None, None, None, None, None, None, None,
None, N, input_layout='BNSD')
>>> print(out.shape)
(1, 16, 256, 16)
"""
pfa = _get_cache_prim(NN_OPS.PromptFlashAttention)(num_heads, scale_value, pre_tokens, next_tokens, input_layout,
num_key_value_heads, sparse_mode, inner_precise)
return pfa(query, key, value, attn_mask, actual_seq_lengths, actual_seq_lengths_kv, pse_shift, deq_scale1,
quant_scale1, deq_scale2, quant_scale2, quant_offset2)
def incre_flash_attention(query, key, value, attn_mask, actual_seq_lengths, pse_shift, dequant_scale1, quant_scale1,
dequant_scale2, quant_scale2, quant_offset2, antiquant_scale, antiquant_offset, block_table,
num_heads, input_layout="BSH", scale_value=1.0, num_key_value_heads=0, block_size=0,
inner_precise=1):
r"""
The interface for fully inference.
B -- Batch size
S -- Sequence length
H -- Hidden size
.. warning::
This is an experimental API that is subject to change or deletion.
If there is no input parameter and no default value, None needs to be passed.
Inputs:
- **query** (Tensor) - The query tensor with data type of float16 or bfloat16.
Input tensor of shape :math:`(B, 1, H)` / :math:`(B, N, 1, D)`.
- **key** (TensorList) - The key tensor with data type of float16 or bfloat16.
Input tensor of shape :math:`(B, S, H)` / :math:`(B, N, S, D)`.
- **value** (TensorList) - The value tensor with data type of float16 or bfloat16.
Input tensor of shape :math:`(B, S, H)` / :math:`(B, N, S, D)`.
- **attn_mask** (Tensor) - The attention mask tensor with data type of float16 or bool.
Input tensor of shape :math:`(B, S)` / :math:`(B, 1, S)` / :math:`(B, 1, 1, S)`.
- **actual_seq_lengths** (Tensor) - Describe actual sequence length of each input with data type of int.
- **pse_shift** (Tensor) - The position encoding tensor with data type of float16 or float32.
- **dequant_scale1** (Tensor) - Quantitative parametor, the tensor with data type of uint64.
- **quant_scale1** (Tensor) - Quantitative parametor, the tensor with data type of float.
- **dequant_scale2** (Tensor) - Quantitative parametor, the tensor with data type of uint64.
- **quant_scale2** (Tensor) - Quantitative parametor, the tensor with data type of float.
- **quant_offset2** (Tensor) - Quantitative parametor, the tensor with data type of float.
- **antiquant_scale** (Tensor) - Quantitative parametor, the tensor with data type of float.
- **antiquant_offset** (Tensor) - Quantitative parametor, the tensor with data type of float.
- **block_table** (Tensor) - The tensor with data type of float.
- **num_heads** (int) - The number of heads.
- **input_layout** (str) - the data layout of the input qkv, support `(BSH)` and `(BNSD)`. Default `BSH`.
- **scale_value** (double) - The scale value indicating the scale coefficient, which is used as the scalar of
Muls in the calculation. Default: 1.0.
- **num_key_value_heads** (int) - head numbers of key/value which are used in GQA algorithm.
The value o indicates if the key and value have the same head nums, use numHeads. Default: 0.
- **block_size** (int) - Default: 0.
- **inner_precise** (int) - Default: 1.
Outputs:
- **attention_out** (Tensor) - Input tensor of shape :math:`(B, 1, H)` / :math:`(B, N, 1, D)`.
Supported Platforms:
``Ascend``
"""
_ifa = _get_cache_prim(NN_OPS.IncreFlashAttention)(num_heads, input_layout, scale_value, num_key_value_heads,
block_size, inner_precise)
return _ifa(query, key, value, attn_mask, actual_seq_lengths, pse_shift, dequant_scale1, quant_scale1,
dequant_scale2, quant_scale2, quant_offset2, antiquant_scale, antiquant_offset, block_table)
[文档]def embedding(input, weight, padding_idx=None, max_norm=None, norm_type=2.0, scale_grad_by_freq=False):
r"""
Retrieve the word embeddings in `weight` using indices specified in `input`.
.. warning::
On Ascend, the behavior is unpredictable when the value of input is invalid.
Args:
input (Tensor): The indices used to lookup in the `weight`. The data type must be mindspore.int32 or
mindspore.int64, and the value should be in range `[0, weight.shape[0])`.
weight (Parameter): The matrix where to lookup from. The shape must be 2D.
padding_idx (int, optional): If the value is not None, the corresponding row of `weight` will not be updated
in training. The value should be in range `[-weight.shape[0], weight.shape[0])` if it's not ``None``.
Default ``None``.
max_norm (float, optional): If not None, firstly get the p-norm result of the `weight` specified by `input`
where p is specified by `norm_type`; if the result is larger then `max_norm`, update the `weight`
with :math:`\frac{max\_norm}{result+1e^{-7}}` in-place. Default ``None``.
norm_type (float, optional): Indicates the value of p in p-norm. Default ``2.0``.
scale_grad_by_freq (bool, optional): If ``True`` the gradients will be scaled by the inverse of frequency of
the index in `input`. Default ``False``.
Returns:
Tensor, has the same data type as `weight`, the shape is :math:`(*input.shape, weight.shape[1])`.
Raises:
ValueError: If `padding_idx` is out of valid range.
ValueError: If the shape of `weight` is invalid.
TypeError: `weight` is not a :class:`mindspore.Parameter`.
Supported Platforms:
``Ascend``
Examples:
>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, Parameter, ops
>>> input = Tensor([[1, 0, 1, 1], [0, 0, 1, 0]])
>>> weight = Parameter(np.random.randn(3, 3).astype(np.float32))
>>> output = ops.embedding(input, weight, max_norm=0.4)
>>> print(output)
[[[ 5.49015924e-02, 3.47811311e-01, -1.89771220e-01],
[ 2.09307984e-01, -2.24846993e-02, 3.40124398e-01],
[ 5.49015924e-02, 3.47811311e-01, -1.89771220e-01],
[ 5.49015924e-02, 3.47811311e-01, -1.89771220e-01]],
[[ 2.09307984e-01, -2.24846993e-02, 3.40124398e-01],
[ 2.09307984e-01, -2.24846993e-02, 3.40124398e-01],
[ 5.49015924e-02, 3.47811311e-01, -1.89771220e-01],
[ 2.09307984e-01, -2.24846993e-02, 3.40124398e-01]]]
"""
if not isinstance(weight, Parameter):
raise TypeError(f"For Embedding, the weight must be a mindspore.Parameter, but got {type(weight)}.")
return embedding_op(input, weight, padding_idx, max_norm, norm_type, scale_grad_by_freq)
__all__ = [
'adaptive_avg_pool1d',
'adaptive_avg_pool2d',
'adaptive_avg_pool3d',
'adaptive_max_pool1d',
'adaptive_max_pool2d',
'adaptive_max_pool3d',
'avg_pool1d',
'avg_pool2d',
'avg_pool3d',
'batch_norm',
'bias_add',
'bidense',
'binary_cross_entropy',
'binary_cross_entropy_with_logits',
'cosine_embedding_loss',
'max_pool2d',
'max_pool3d',
'kl_div',
'celu',
'dense',
'deformable_conv2d',
'dropout1d',
'dropout2d',
'dropout3d',
'embedding',
'fast_gelu',
'fractional_max_pool2d',
'fractional_max_pool3d',
'pixel_shuffle',
'pixel_unshuffle',
'hardshrink',
'is_floating_point',
'flip',
'fliplr',
'flipud',
'intopk',
'interpolate',
'upsample',
'layer_norm',
'log_softmax',
'mish',
'lrn',
'hardswish',
'hardtanh',
'huber_loss',
'softsign',
'softshrink',
'soft_shrink',
'softplus',
'selu',
'silu',
'soft_margin_loss',
'softmax',
'softmin',
'pdist',
'pad',
'prelu',
'mirror_pad',
'cross_entropy',
'grid_sample',
'smooth_l1_loss',
'l1_loss',
'threshold',
'leaky_relu',
'nll_loss',
'ctc_loss',
'ctc_greedy_decoder',
'dropout',
'conv3d_transpose',
'conv1d',
'conv2d',
'conv_transpose2d',
'sigmoid',
'logsigmoid',
'relu',
'relu6',
'rrelu',
'conv3d',
'glu',
'margin_ranking_loss',
'multi_margin_loss',
'multilabel_margin_loss',
'multilabel_soft_margin_loss',
'elu',
'gelu',
'hinge_embedding_loss',
'gaussian_nll_loss',
'lp_pool1d',
'lp_pool2d',
'max_unpool1d',
'max_unpool2d',
'max_unpool3d',
'mse_loss',
'msort',
'triplet_margin_loss',
'channel_shuffle',
'hardsigmoid',
'group_norm',
'rms_norm',
]
__all__.sort()