# Copyright 2020-2021 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
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# ============================================================================
"""conv"""
import numpy as np
from mindspore import log as logger
from mindspore import context
from mindspore.ops import operations as P
from mindspore.ops.primitive import constexpr
from mindspore.common.parameter import Parameter
from mindspore.common.initializer import initializer
from mindspore.common.tensor import Tensor
from mindspore._checkparam import Validator, Rel, twice, _check_3d_int_or_tuple
from mindspore._extends import cell_attr_register
from ..cell import Cell
__all__ = ['Conv2d', 'Conv2dTranspose', 'Conv1d', 'Conv1dTranspose', 'Conv3d', 'Conv3dTranspose']
class _Conv(Cell):
"""
Applies a N-D convolution over an input signal composed of several input planes.
"""
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init,
data_format='NCHW',
transposed=False):
"""Initialize _Conv."""
super(_Conv, self).__init__()
self.in_channels = Validator.check_positive_int(in_channels, 'in_channels', self.cls_name)
self.out_channels = Validator.check_positive_int(out_channels, 'out_channels', self.cls_name)
self.kernel_size = kernel_size
self.stride = stride
self.pad_mode = pad_mode
self.weight_init = weight_init
self.bias_init = bias_init
self.format = Validator.check_string(data_format, ['NCHW', 'NHWC', 'NCDHW'], 'format', self.cls_name)
if context.get_context("device_target") != "GPU" and self.format == "NHWC":
raise ValueError(f"For '{self.cls_name}', the \"NHWC\" format only support in GPU target, "
f"but got the 'format' is {self.format} and "
f"the platform is {context.get_context('device_target')}.")
if context.get_context("device_target") == "CPU" and self.format == "NCDHW":
raise ValueError(f"For '{self.cls_name}', the \"NCDHW\" format only support in Ascend and GPU target, "
f"but got the 'format' is {self.format} and "
f"the platform is {context.get_context('device_target')}.")
if isinstance(padding, int):
Validator.check_non_negative_int(padding, 'padding', self.cls_name)
self.padding = padding
elif isinstance(padding, tuple):
for pad in padding:
Validator.check_non_negative_int(pad, 'padding item', self.cls_name)
self.padding = padding
else:
raise TypeError(f"For '{self.cls_name}', the type of 'padding' must be int or tuple(int), "
f"but got {type(padding).__name__}.")
self.dilation = dilation
self.group = Validator.check_positive_int(group)
self.has_bias = has_bias
for kernel_size_elem in kernel_size:
Validator.check_positive_int(kernel_size_elem, 'kernel_size item', self.cls_name)
for stride_elem in stride:
Validator.check_positive_int(stride_elem, 'stride item', self.cls_name)
for dilation_elem in dilation:
Validator.check_positive_int(dilation_elem, 'dilation item', self.cls_name)
if in_channels % group != 0:
raise ValueError(f"For '{self.cls_name}', the attr 'in_channels' must be divisible by attr 'group', "
f"but got 'in_channels': {in_channels} and 'group': {group}.")
if out_channels % group != 0:
raise ValueError(f"For '{self.cls_name}', the 'out_channels' must be divisible by attr 'group', "
f"but got 'out_channels': {out_channels} and 'group': {group}.")
if transposed:
shape = [in_channels, out_channels // group, *kernel_size]
else:
shape = [out_channels, *kernel_size, in_channels // group] if self.format == "NHWC" else \
[out_channels, in_channels // group, *kernel_size]
self.weight = Parameter(initializer(self.weight_init, shape), name='weight')
if Validator.check_bool(has_bias, "has_bias", self.cls_name):
self.bias = Parameter(initializer(self.bias_init, [out_channels]), name='bias')
else:
if self.bias_init != 'zeros':
logger.warning("Value of 'has_bias' is False, value of 'bias_init' will be ignored.")
self.bias = None
def construct(self, *inputs):
"""Must be overridden by all subclasses."""
raise NotImplementedError
[docs]class Conv2d(_Conv):
r"""
2D convolution layer.
Applies a 2D convolution over an input tensor which is typically of shape :math:`(N, C_{in}, H_{in}, W_{in})`,
where :math:`N` is batch size, :math:`C_{in}` is channel number, and :math:`H_{in}, W_{in}` are height and width.
For each batch of shape :math:`(C_{in}, H_{in}, W_{in})`, the formula is defined as:
.. math::
out_j = \sum_{i=0}^{C_{in} - 1} ccor(W_{ij}, X_i) + b_j,
where :math:`ccor` is the cross-correlation operator, :math:`C_{in}` is the input channel number, :math:`j` ranges
from :math:`0` to :math:`C_{out} - 1`, :math:`W_{ij}` corresponds to the :math:`i`-th channel of the :math:`j`-th
filter and :math:`out_{j}` corresponds to the :math:`j`-th channel of the output. :math:`W_{ij}` is a slice
of kernel and it has shape :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 convolution kernel. The full kernel has shape
:math:`(C_{out}, C_{in} // \text{group}, \text{kernel_size[0]}, \text{kernel_size[1]})`,
where group is the group number to split the input `x` in the channel dimension.
If the 'pad_mode' is set to be "valid", the output height and width will be
:math:`\left \lfloor{1 + \frac{H_{in} + \text{padding[0]} + \text{padding[1]} - \text{kernel_size[0]} -
(\text{kernel_size[0]} - 1) \times (\text{dilation[0]} - 1) }{\text{stride[0]}}} \right \rfloor` and
:math:`\left \lfloor{1 + \frac{W_{in} + \text{padding[2]} + \text{padding[3]} - \text{kernel_size[1]} -
(\text{kernel_size[1]} - 1) \times (\text{dilation[1]} - 1) }{\text{stride[1]}}} \right \rfloor` respectively.
The first introduction can be found in paper `Gradient Based Learning Applied to Document Recognition
<http://vision.stanford.edu/cs598_spring07/papers/Lecun98.pdf>`_.
Args:
in_channels (int): The number of input channel :math:`C_{in}`.
out_channels (int): The number of output channel :math:`C_{out}`.
kernel_size (Union[int, tuple[int]]): The data type is int or a tuple of 2 integers. Specifies the height
and width of the 2D convolution window. Single int means the value is for both the height and the width of
the kernel. A tuple of 2 ints means the first value is for the height and the other is for the
width of the kernel.
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.
pad_mode (str): Specifies padding mode. The optional values are
"same", "valid", "pad". Default: "same".
- same: Adopts the way of completion. The height and width of the output will be the same as
the input `x`. The total number of padding will be calculated in horizontal and vertical
directions and evenly distributed to top and bottom, left and right if possible. Otherwise, the
last extra padding will be done 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]]): 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
with four integers, the paddings of top, bottom, left and right will be equal to padding[0],
padding[1], padding[2], and padding[3] accordingly. Default: 0.
dilation (Union[int, tuple[int]]): 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 or equal to 1 and bounded by the height and width of the
input `x`. Default: 1.
group (int): Splits filter into groups, `in_ channels` and `out_channels` must be
divisible by the number of groups. If the group is equal to `in_channels` and `out_channels`,
this 2D convolution layer also can be called 2D depthwise convolution layer. Default: 1.
has_bias (bool): Specifies whether the layer uses a bias vector. Default: False.
weight_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the convolution kernel.
It can be a Tensor, a string, an Initializer or a number. When a string is specified,
values from 'TruncatedNormal', 'Normal', 'Uniform', 'HeUniform' and 'XavierUniform' distributions as well
as constant 'One' and 'Zero' distributions are possible. Alias 'xavier_uniform', 'he_uniform', 'ones'
and 'zeros' are acceptable. Uppercase and lowercase are both acceptable. Refer to the values of
Initializer for more details. Default: 'normal'.
bias_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the bias vector. Possible
Initializer and string are the same as 'weight_init'. Refer to the values of
Initializer for more details. Default: 'zeros'.
data_format (str): The optional value for data format, is 'NHWC' or 'NCHW'.
Default: 'NCHW'.
Inputs:
- **x** (Tensor) - Tensor of shape :math:`(N, C_{in}, H_{in}, W_{in})` \
or :math:`(N, H_{in}, W_{in}, C_{in})`.
Outputs:
Tensor of shape :math:`(N, C_{out}, H_{out}, W_{out})` or :math:`(N, H_{out}, W_{out}, C_{out})`.
Raises:
TypeError: If `in_channels`, `out_channels` or `group` is not an int.
TypeError: If `kernel_size`, `stride`, `padding` or `dilation` is neither an int not a tuple.
ValueError: If `in_channels`, `out_channels`, `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid', 'pad'.
ValueError: If `padding` is a tuple whose length is not equal to 4.
ValueError: If `pad_mode` is not equal to 'pad' and `padding` is not equal to (0, 0, 0, 0).
ValueError: If `data_format` is neither 'NCHW' not 'NHWC'.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> net = nn.Conv2d(120, 240, 4, has_bias=False, weight_init='normal')
>>> x = Tensor(np.ones([1, 120, 1024, 640]), mindspore.float32)
>>> output = net(x).shape
>>> print(output)
(1, 240, 1024, 640)
"""
@cell_attr_register
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
pad_mode='same',
padding=0,
dilation=1,
group=1,
has_bias=False,
weight_init='normal',
bias_init='zeros',
data_format='NCHW'):
"""Initialize Conv2d."""
kernel_size = twice(kernel_size)
stride = twice(stride)
self._dilation = dilation
dilation = twice(dilation)
super(Conv2d, self).__init__(
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init,
data_format)
self.conv2d = P.Conv2D(out_channel=self.out_channels,
kernel_size=self.kernel_size,
mode=1,
pad_mode=self.pad_mode,
pad=self.padding,
stride=self.stride,
dilation=self.dilation,
group=self.group,
data_format=self.format)
self.bias_add = P.BiasAdd(data_format=self.format)
def construct(self, x):
output = self.conv2d(x, self.weight)
if self.has_bias:
output = self.bias_add(output, self.bias)
return output
def extend_repr(self):
s = 'input_channels={}, output_channels={}, kernel_size={}, ' \
'stride={}, pad_mode={}, padding={}, dilation={}, ' \
'group={}, has_bias={}, ' \
'weight_init={}, bias_init={}, format={}'.format(
self.in_channels,
self.out_channels,
self.kernel_size,
self.stride,
self.pad_mode,
self.padding,
self.dilation,
self.group,
self.has_bias,
self.weight_init,
self.bias_init,
self.format)
return s
@constexpr
def _check_input_3d(input_shape, op_name):
if len(input_shape) != 3:
raise ValueError(f"For '{op_name}', the dimension of input should be 3d, but got {len(input_shape)}.")
[docs]class Conv1d(_Conv):
r"""
1D convolution layer.
Applies a 1D convolution over an input tensor which is typically of shape :math:`(N, C_{in}, W_{in})`,
where :math:`N` is batch size and :math:`C_{in}` is channel number. For each batch of shape
:math:`(C_{in}, W_{in})`, the formula is defined as:
.. math::
out_j = \sum_{i=0}^{C_{in} - 1} ccor(W_{ij}, X_i) + b_j,
where :math:`ccor` is the cross correlation operator, :math:`C_{in}` is the input channel number, :math:`j` ranges
from :math:`0` to :math:`C_{out} - 1`, :math:`W_{ij}` corresponds to the :math:`i`-th channel of the :math:`j`-th
filter and :math:`out_{j}` corresponds to the :math:`j`-th channel of the output. :math:`W_{ij}` is a slice
of kernel and it has shape :math:`(\text{ks_w})`, where :math:`\text{ks_w}` is the width of the convolution kernel.
The full kernel has shape :math:`(C_{out}, C_{in} // \text{group}, \text{ks_w})`, where group is the group number
to split the input `x` in the channel dimension.
If the 'pad_mode' is set to be "valid", the output width will be
:math:`\left \lfloor{1 + \frac{W_{in} + 2 \times \text{padding} - \text{ks_w} -
(\text{ks_w} - 1) \times (\text{dilation} - 1) }{\text{stride}}} \right \rfloor` respectively.
The first introduction of convolution layer can be found in paper `Gradient Based Learning Applied to Document
Recognition <http://vision.stanford.edu/cs598_spring07/papers/Lecun98.pdf>`_.
Args:
in_channels (int): The number of input channel :math:`C_{in}`.
out_channels (int): The number of output channel :math:`C_{out}`.
kernel_size (int): The data type is int. Specifies the
width of the 1D convolution window.
stride (int): The distance of kernel moving, an int number that represents
the width of movement. Default: 1.
pad_mode (str): Specifies padding mode. The optional values are
"same", "valid", "pad". Default: "same".
- same: Adopts the way of completion. The output width will be the same as the input `x`.
The total number of padding will be calculated in the horizontal
direction and evenly distributed to left and right if possible. Otherwise, the
last extra padding will be done 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 width of the 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 (int): Implicit paddings on both sides of the input `x`. Default: 0.
dilation (int): The data type is int. 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 or equal to 1 and bounded by the height and width of the
input `x`. Default: 1.
group (int): Splits filter into groups, `in_ channels` and `out_channels` must be
divisible by the number of groups. Default: 1.
has_bias (bool): Specifies whether the layer uses a bias vector. Default: False.
weight_init (Union[Tensor, str, Initializer, numbers.Number]): An initializer for the convolution kernel.
It can be a Tensor, a string, an Initializer or a number. When a string is specified,
values from 'TruncatedNormal', 'Normal', 'Uniform', 'HeUniform' and 'XavierUniform' distributions as well
as constant 'One' and 'Zero' distributions are possible. Alias 'xavier_uniform', 'he_uniform', 'ones'
and 'zeros' are acceptable. Uppercase and lowercase are both acceptable. Refer to the values of
Initializer for more details. Default: 'normal'.
bias_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the bias vector. Possible
Initializer and string are the same as 'weight_init'. Refer to the values of
Initializer for more details. Default: 'zeros'.
Inputs:
- **x** (Tensor) - Tensor of shape :math:`(N, C_{in}, W_{in})`.
Outputs:
Tensor of shape :math:`(N, C_{out}, W_{out})`.
Raises:
TypeError: If `in_channels`, `out_channels`, `kernel_size`, `stride`, `padding` or `dilation` is not an int.
ValueError: If `in_channels`, `out_channels`, `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid', 'pad'.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> net = nn.Conv1d(120, 240, 4, has_bias=False, weight_init='normal')
>>> x = Tensor(np.ones([1, 120, 640]), mindspore.float32)
>>> output = net(x).shape
>>> print(output)
(1, 240, 640)
"""
@cell_attr_register
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
pad_mode='same',
padding=0,
dilation=1,
group=1,
has_bias=False,
weight_init='normal',
bias_init='zeros'):
"""Initialize Conv1d."""
Validator.check_value_type("kernel_size", kernel_size, [int], self.cls_name)
Validator.check_value_type("stride", stride, [int], self.cls_name)
Validator.check_value_type("padding", padding, [int], self.cls_name)
Validator.check_value_type("dilation", dilation, [int], self.cls_name)
Validator.check_int(kernel_size, 1, Rel.GE, 'kernel_size', self.cls_name)
Validator.check_int(stride, 1, Rel.GE, 'stride', self.cls_name)
Validator.check_non_negative_int(padding, 'padding', self.cls_name)
Validator.check_int(dilation, 1, Rel.GE, 'dilation', self.cls_name)
kernel_size = (1, kernel_size)
stride = (1, stride)
dilation = (1, dilation)
get_shape = P.Shape()
get_dtype = P.DType()
if isinstance(weight_init, Tensor):
weight_init_shape = get_shape(weight_init)
Validator.check_equal_int(len(weight_init_shape), 3, 'weight_init_shape', self.cls_name)
weight_init_dtype = get_dtype(weight_init)
weight_init_value = weight_init.asnumpy()
weight_init_value = np.expand_dims(weight_init_value, 2)
weight_init = Tensor(weight_init_value, weight_init_dtype)
super(Conv1d, self).__init__(
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init)
self.padding = (0, 0, padding, padding)
Validator.check_string(pad_mode, ['valid', 'same', 'pad'], 'pad_mode', self.cls_name)
self.conv2d = P.Conv2D(out_channel=self.out_channels,
kernel_size=self.kernel_size,
mode=1,
pad_mode=self.pad_mode,
pad=self.padding,
stride=self.stride,
dilation=self.dilation,
group=self.group)
self.bias_add = P.BiasAdd()
self.expand_dims = P.ExpandDims()
self.squeeze = P.Squeeze(2)
self.shape = P.Shape()
def construct(self, x):
x_shape = self.shape(x)
_check_input_3d(x_shape, self.cls_name)
x = self.expand_dims(x, 2)
output = self.conv2d(x, self.weight)
if self.has_bias:
output = self.bias_add(output, self.bias)
output = self.squeeze(output)
return output
def extend_repr(self):
s = 'input_channels={}, output_channels={}, kernel_size={}, ' \
'stride={}, pad_mode={}, padding={}, dilation={}, ' \
'group={}, has_bias={}, ' \
'weight_init={}, bias_init={}'.format(
self.in_channels,
self.out_channels,
self.kernel_size,
self.stride,
self.pad_mode,
self.padding,
self.dilation,
self.group,
self.has_bias,
self.weight_init,
self.bias_init)
return s
@constexpr
def _check_input_5dims(input_shape, op_name):
if len(input_shape) != 5:
raise ValueError(f"For '{op_name}', the dimension of input should be 5d, but got {len(input_shape)}.")
[docs]class Conv3d(_Conv):
r"""
3D convolution layer.
Applies a 3D convolution over an input tensor which is typically of shape
:math:`(N, C_{in}, D_{in}, H_{in}, W_{in})` and output shape
:math:`(N, C_{out}, D_{out}, H_{out}, W_{out})`. where :math:`N` is batch size. :math:`C` is channel number.
the formula is defined as:
.. math::
\operatorname{out}\left(N_{i}, C_{\text {out}_j}\right)=\operatorname{bias}\left(C_{\text {out}_j}\right)+
\sum_{k=0}^{C_{in}-1} ccor(\text {weight}\left(C_{\text {out}_j}, k\right),
\operatorname{input}\left(N_{i}, k\right))
where :math:`ccor` is the cross-correlation operator.
If the 'pad_mode' is set to be "valid", the output depth, height and width will be
:math:`\left \lfloor{1 + \frac{D_{in} + \text{padding[0]} + \text{padding[1]} - \text{kernel_size[0]} -
(\text{kernel_size[0]} - 1) \times (\text{dilation[0]} - 1) }{\text{stride[0]}}} \right \rfloor` and
:math:`\left \lfloor{1 + \frac{H_{in} + \text{padding[2]} + \text{padding[3]} - \text{kernel_size[1]} -
(\text{kernel_size[1]} - 1) \times (\text{dilation[1]} - 1) }{\text{stride[1]}}} \right \rfloor` and
:math:`\left \lfloor{1 + \frac{W_{in} + \text{padding[4]} + \text{padding[5]} - \text{kernel_size[2]} -
(\text{kernel_size[2]} - 1) \times (\text{dilation[2]} - 1) }{\text{stride[2]}}} \right \rfloor` respectively.
Args:
in_channels (int): The number of input channel :math:`C_{in}`.
out_channels (int): The number of output channel :math:`C_{out}`.
kernel_size (Union[int, tuple[int]]): The data type is int or a tuple of 3 integers.
Specifies the depth, height and width of the 3D convolution window.
Single int means the value is for the depth, height and the width of the kernel.
A tuple of 3 ints means the first value is for the depth, second value is for height and the
other is for the width of the kernel.
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.
pad_mode (str): Specifies padding mode. The optional values are
"same", "valid", "pad". Default: "same".
- same: Adopts the way of completion. The depth, height and width of the output will be the same as
the input `x`. The total number of padding will be calculated in depth, horizontal and vertical
directions and evenly distributed to head and tail, top and bottom, left and right if possible.
Otherwise, the last extra padding will be done from the tail, bottom and the right side.
If this mode is set, `padding` 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, `padding`
must be 0.
- pad: Implicit paddings on both sides of the input `x` in depth, height, width. 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])): Implicit paddings on both sides of the input `x`.
The data type is int or a tuple of 6 integers. Default: 0. If `padding` is an integer,
the paddings of head, tail, top, bottom, left and right are the same, equal to padding.
If `paddings` 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.
dilation (Union[int, tuple[int]]): 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.
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 or equal to 1 and bounded by the height and width of the input `x`. Default: 1.
group (int): Splits filter into groups, `in_ channels` and `out_channels` must be
divisible by the number of groups. Default: 1. Only 1 is currently supported.
has_bias (bool): Specifies whether the layer uses a bias vector. Default: False.
weight_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the convolution kernel.
It can be a Tensor, a string, an Initializer or a number. When a string is specified,
values from 'TruncatedNormal', 'Normal', 'Uniform', 'HeUniform' and 'XavierUniform' distributions as well
as constant 'One' and 'Zero' distributions are possible. Alias 'xavier_uniform', 'he_uniform', 'ones'
and 'zeros' are acceptable. Uppercase and lowercase are both acceptable. Refer to the values of
Initializer for more details. Default: 'normal'.
bias_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the bias vector. Possible
Initializer and string are the same as 'weight_init'. Refer to the values of
Initializer for more details. Default: 'zeros'.
data_format (str): The optional value for data format. Currently only support "NCDHW".
Inputs:
- **x** (Tensor) - Tensor of shape :math:`(N, C_{in}, D_{in}, H_{in}, W_{in})`.
Currently input data type only support float16 and float32.
Outputs:
Tensor, the value that applied 3D convolution. The shape is :math:`(N, C_{out}, D_{out}, H_{out}, W_{out})`.
Raises:
TypeError: If `in_channels`, `out_channels` or `group` is not an int.
TypeError: If `kernel_size`, `stride`, `padding` or `dilation` is neither an int nor a tuple.
ValueError: If `out_channels`, `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid', 'pad'.
ValueError: If `padding` is a tuple whose length is not equal to 6.
ValueError: If `pad_mode` is not equal to 'pad' and `padding` is not equal to (0, 0, 0, 0, 0, 0).
ValueError: If `data_format` is not 'NCDHW'.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> x = Tensor(np.ones([16, 3, 10, 32, 32]), mindspore.float32)
>>> conv3d = nn.Conv3d(in_channels=3, out_channels=32, kernel_size=(4, 3, 3))
>>> output = conv3d(x)
>>> print(output.shape)
(16, 32, 10, 32, 32)
"""
@cell_attr_register
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
pad_mode='same',
padding=0,
dilation=1,
group=1,
has_bias=False,
weight_init='normal',
bias_init='zeros',
data_format='NCDHW'):
"""Initialize Conv3d."""
kernel_size = _check_3d_int_or_tuple("kernel_size", kernel_size, self.cls_name)
stride = _check_3d_int_or_tuple("stride", stride, self.cls_name)
dilation = _check_3d_int_or_tuple("dilation", dilation, self.cls_name)
Validator.check_value_type('padding', padding, (int, tuple), self.cls_name)
if isinstance(padding, tuple):
Validator.check_equal_int(len(padding), 6, 'padding size', self.cls_name)
super(Conv3d, self).__init__(
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init,
data_format)
self.conv3d = P.Conv3D(out_channel=self.out_channels,
kernel_size=self.kernel_size,
mode=1,
pad_mode=self.pad_mode,
pad=self.padding,
stride=self.stride,
dilation=self.dilation,
group=self.group,
data_format=self.format)
self.bias_add = P.BiasAdd(data_format=self.format)
self.shape = P.Shape()
def construct(self, x):
x_shape = self.shape(x)
_check_input_5dims(x_shape, self.cls_name)
output = self.conv3d(x, self.weight)
if self.has_bias:
output = self.bias_add(output, self.bias)
return output
def extend_repr(self):
s = 'input_channels={}, output_channels={}, kernel_size={}, ' \
'stride={}, pad_mode={}, padding={}, dilation={}, ' \
'group={}, has_bias={}, ' \
'weight_init={}, bias_init={}, format={}'.format(
self.in_channels,
self.out_channels,
self.kernel_size,
self.stride,
self.pad_mode,
self.padding,
self.dilation,
self.group,
self.has_bias,
self.weight_init,
self.bias_init,
self.format)
return s
[docs]class Conv3dTranspose(_Conv):
r"""
Compute a 3D transposed convolution, which is also known as a deconvolution
(although it is not an actual deconvolution).
The transposed convolution operator multiplies each input value element-wise by a learnable kernel,
and sums over the outputs from all input feature planes.
This module can be seen as the gradient of Conv3d with respect to its input.
`x` is typically of shape :math:`(N, C, D, H, W)`, where :math:`N` is batch size, :math:`C` is channel number,
:math:`D` is the characteristic depth, :math:`H` is the height of the characteristic layer,
and :math:`W` is the width of the characteristic layer.
The calculation process of transposed convolution is equivalent to the reverse calculation of convolution.
The pad_mode argument effectively adds :math:`dilation * (kernel\_size - 1) - padding` amount of zero padding
to both sizes of the input. So that when a Conv3d and a ConvTranspose3d are initialized with same parameters,
they are inverses of each other in regard to the input and output shapes.
However, when stride > 1, Conv3d maps multiple input shapes to the same output shape.
ConvTranspose3d provide padding argument to increase the calculated output shape on one or more side.
The height and width of output are defined as:
if the 'pad_mode' is set to be "pad",
.. math::
D_{out} = (D_{in} - 1) \times \text{stride_d} - 2 \times \text{padding_d} + \text{dilation_d} \times
(\text{kernel_size_d} - 1) + \text{output_padding_d} + 1
H_{out} = (H_{in} - 1) \times \text{stride_h} - 2 \times \text{padding_h} + \text{dilation_h} \times
(\text{kernel_size_h} - 1) + \text{output_padding_h} + 1
W_{out} = (W_{in} - 1) \times \text{stride_w} - 2 \times \text{padding_w} + \text{dilation_w} \times
(\text{kernel_size_w} - 1) + \text{output_padding_w} + 1
if the 'pad_mode' is set to be "same",
.. math::
D_{out} = (D_{in} + \text{stride_d} - 1)/\text{stride_d} \\
H_{out} = (H_{in} + \text{stride_h} - 1)/\text{stride_h} \\
W_{out} = (W_{in} + \text{stride_w} - 1)/\text{stride_w}
if the 'pad_mode' is set to be "valid",
.. math::
D_{out} = (D_{in} - 1) \times \text{stride_d} + \text{dilation_d} \times
(\text{kernel_size_d} - 1) + 1 \\
H_{out} = (H_{in} - 1) \times \text{stride_h} + \text{dilation_h} \times
(\text{kernel_size_h} - 1) + 1 \\
W_{out} = (W_{in} - 1) \times \text{stride_w} + \text{dilation_w} \times
(\text{kernel_size_w} - 1) + 1
Args:
in_channels (int): The number of input channel :math:`C_{in}`.
out_channels (int): The number of output channel :math:`C_{out}`.
kernel_size (Union[int, tuple[int]]): The kernel size of the 3D convolution.
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. Its value must be equal to or greater than 1.
Default: 1.
pad_mode (str): Select the mode of the pad. The optional values are
"pad", "same", "valid". Default: "same".
- same: Adopts the way of completion. The depth, height and width of the output will be the same as
the input `x`. The total number of padding will be calculated in depth, horizontal and vertical
directions and evenly distributed to head and tail, top and bottom, left and right if possible.
Otherwise, the last extra padding will be done from the tail, bottom and the right side.
If this mode is set, `padding` and `output_padding` 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, `padding`
and `output_padding` must be 0.
- pad: Implicit paddings on both sides of the input `x` in depth, height, width. The number of `pad` will
be padded to the input Tensor borders. `padding` must be greater than or equal to 0.
padding (Union(int, tuple[int])): The pad 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 padding.
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.
dilation (Union(int, tuple[int])): 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.
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 or equal to 1 and bounded by the height and width of the input `x`. Default: 1.
group (int): Splits filter into groups, `in_ channels` and `out_channels` must be
divisible by the number of 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.
Must be greater than or equal to 0.
has_bias (bool): Specifies whether the layer uses a bias vector. Default: False.
weight_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the convolution kernel.
It can be a Tensor, a string, an Initializer or a number. When a string is specified,
values from 'TruncatedNormal', 'Normal', 'Uniform', 'HeUniform' and 'XavierUniform' distributions as well
as constant 'One' and 'Zero' distributions are possible. Alias 'xavier_uniform', 'he_uniform', 'ones'
and 'zeros' are acceptable. Uppercase and lowercase are both acceptable. Refer to the values of
Initializer for more details. Default: 'normal'.
bias_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the bias vector. Possible
Initializer and string are the same as 'weight_init'. Refer to the values of
Initializer for more details. Default: 'zeros'.
data_format (str): The optional value for data format. Currently only support 'NCDHW'.
Inputs:
- **x** (Tensor) - Tensor of shape :math:`(N, C_{in}, D_{in}, H_{in}, W_{in})`.
Currently input data type only support float16 and float32.
Outputs:
Tensor, the shape is :math:`(N, C_{out}, D_{out}, H_{out}, W_{out})`.
Supported Platforms:
``Ascend`` ``GPU``
Raises:
TypeError: If `in_channels`, `out_channels` or `group` is not an int.
TypeError: If `kernel_size`, `stride`, `padding` , `dilation` or `output_padding`
is neither an int not a tuple of three.
TypeError: If input data type is not float16 or float32.
ValueError: If `in_channels`, `out_channels`, `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid', 'pad'.
ValueError: If `padding` is a tuple whose length is not equal to 6.
ValueError: If `pad_mode` is not equal to 'pad' and `padding` is not equal to (0, 0, 0, 0, 0, 0).
ValueError: If `data_format` is not 'NCDHW'.
Examples:
>>> x = Tensor(np.ones([32, 16, 10, 32, 32]), mindspore.float32)
>>> conv3d_transpose = nn.Conv3dTranspose(in_channels=16, out_channels=3, kernel_size=(4, 6, 2),
... pad_mode='pad')
>>> output = conv3d_transpose(x)
>>> print(output.shape)
(32, 3, 13, 37, 33)
"""
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
pad_mode='same',
padding=0,
dilation=1,
group=1,
output_padding=0,
has_bias=False,
weight_init='normal',
bias_init='zeros',
data_format='NCDHW'):
"""Initialize Conv3dTranspose."""
kernel_size = _check_3d_int_or_tuple("kernel_size", kernel_size, self.cls_name)
stride = _check_3d_int_or_tuple("stride", stride, self.cls_name)
dilation = _check_3d_int_or_tuple("dilation", dilation, self.cls_name)
Validator.check_value_type('padding', padding, (int, tuple), self.cls_name)
if isinstance(padding, tuple):
Validator.check_equal_int(len(padding), 6, 'padding size', self.cls_name)
output_padding = _check_3d_int_or_tuple("output_padding", output_padding, self.cls_name, greater_zero=False)
super(Conv3dTranspose, self).__init__(
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init,
data_format,
transposed=True)
self.conv3d_transpose = P.Conv3DTranspose(in_channel=self.in_channels,
out_channel=self.out_channels,
kernel_size=self.kernel_size,
mode=1,
pad_mode=self.pad_mode,
pad=self.padding,
stride=self.stride,
dilation=self.dilation,
group=self.group,
output_padding=output_padding,
data_format=self.format)
self.bias_add = P.BiasAdd(data_format=self.format)
self.shape = P.Shape()
def construct(self, x):
x_shape = self.shape(x)
_check_input_5dims(x_shape, self.cls_name)
output = self.conv3d_transpose(x, self.weight)
if self.has_bias:
output = self.bias_add(output, self.bias)
return output
def extend_repr(self):
s = 'input_channels={}, output_channels={}, kernel_size={}, ' \
'stride={}, pad_mode={}, padding={}, dilation={}, ' \
'group={}, has_bias={}, ' \
'weight_init={}, bias_init={}'.format(self.in_channels,
self.out_channels,
self.kernel_size,
self.stride,
self.pad_mode,
self.padding,
self.dilation,
self.group,
self.has_bias,
self.weight_init,
self.bias_init)
return s
def _deconv_output_length(is_valid, is_same, is_pad, input_length, filter_size, stride_size, dilation_size, padding):
"""Calculate the width and height of output."""
length = 0
filter_size = filter_size + (filter_size - 1) * (dilation_size - 1)
if is_valid:
if filter_size - stride_size > 0:
length = input_length * stride_size + filter_size - stride_size
else:
length = input_length * stride_size
elif is_same:
length = input_length * stride_size
elif is_pad:
length = input_length * stride_size - padding + filter_size - stride_size
return length
[docs]class Conv2dTranspose(_Conv):
r"""
2D transposed convolution layer.
Compute a 2D transposed convolution, which is also known as a deconvolution
(although it is not an actual deconvolution).
This module can be seen as the gradient of Conv2d with respect to its input.
`x` is typically of shape :math:`(N, C, H, W)`, where :math:`N` is batch size, :math:`C` is channel number,
:math:`H` is the height of the characteristic layer and :math:`W` is the width of the characteristic layer.
The pad_mode argument effectively adds :math:`dilation * (kernel\_size - 1) - padding` amount of zero padding
to both sizes of the input. So that when a Conv2d and a ConvTranspose2d are initialized with same parameters,
they are inverses of each other in regard to the input and output shapes.
However, when stride > 1, Conv2d maps multiple input shapes to the same output shape.
ConvTranspose2d provide padding argument to increase the calculated output shape on one or more side.
The height and width of output are defined as:
if the 'pad_mode' is set to be "pad",
.. math::
H_{out} = (H_{in} - 1) \times \text{stride[0]} - \left (\text{padding[0]} + \text{padding[1]}\right ) +
\text{dilation[0]} \times (\text{kernel_size[0]} - 1) + 1
W_{out} = (W_{in} - 1) \times \text{stride[1]} - \left (\text{padding[2]} + \text{padding[3]}\right ) +
\text{dilation[1]} \times (\text{kernel_size[1]} - 1) + 1
if the 'pad_mode' is set to be "same",
.. math::
H_{out} = (H_{in} + \text{stride[0]} - 1)/\text{stride[0]} \\
W_{out} = (W_{in} + \text{stride[1]} - 1)/\text{stride[1]}
if the 'pad_mode' is set to be "valid",
.. math::
H_{out} = (H_{in} - 1) \times \text{stride[0]} + \text{dilation[0]} \times
(\text{ks_w[0]} - 1) + 1 \\
W_{out} = (W_{in} - 1) \times \text{stride[1]} + \text{dilation[1]} \times
(\text{ks_w[1]} - 1) + 1
where :math:`\text{kernel_size[0]}` is the height of the convolution kernel and :math:`\text{kernel_size[1]}`
is the width of the convolution kernel.
Args:
in_channels (int): The number of channels in the input space.
out_channels (int): The number of channels in the output space.
kernel_size (Union[int, tuple]): int or a tuple of 2 integers, which specifies the height
and width of the 2D convolution window. Single int means the value is for both the height and the width of
the kernel. A tuple of 2 ints means the first value is for the height and the other is for the
width of the kernel.
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. Its value must be equal to or greater than 1.
Default: 1.
pad_mode (str): Select the mode of the pad. The optional values are
"pad", "same", "valid". Default: "same".
- pad: Implicit paddings on both sides of the input `x`.
- same: Adopted the way of completion.
- valid: Adopted the way of discarding.
padding (Union[int, tuple[int]]): 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
with four integers, the paddings of top, bottom, left and right will be equal to padding[0],
padding[1], padding[2], and padding[3] accordingly. Default: 0.
dilation (Union[int, tuple[int]]): 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.
group (int): Splits filter into groups, `in_channels` and `out_channels` must be
divisible by the number of groups. This does not support for Davinci devices when group > 1. Default: 1.
has_bias (bool): Specifies whether the layer uses a bias vector. Default: False.
weight_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the convolution kernel.
It can be a Tensor, a string, an Initializer or a number. When a string is specified,
values from 'TruncatedNormal', 'Normal', 'Uniform', 'HeUniform' and 'XavierUniform' distributions as well
as constant 'One' and 'Zero' distributions are possible. Alias 'xavier_uniform', 'he_uniform', 'ones'
and 'zeros' are acceptable. Uppercase and lowercase are both acceptable. Refer to the values of
Initializer for more details. Default: 'normal'.
bias_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the bias vector. Possible
Initializer and string are the same as 'weight_init'. Refer to the values of
Initializer for more details. Default: 'zeros'.
Inputs:
- **x** (Tensor) - Tensor of shape :math:`(N, C_{in}, H_{in}, W_{in})`.
Outputs:
Tensor of shape :math:`(N, C_{out}, H_{out}, W_{out})`.
Raises:
TypeError: If `in_channels`, `out_channels` or `group` is not an int.
TypeError: If `kernel_size`, `stride`, `padding` or `dilation` is neither an int not a tuple.
ValueError: If `in_channels`, `out_channels`, `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid', 'pad'.
ValueError: If `padding` is a tuple whose length is not equal to 4.
ValueError: If `pad_mode` is not equal to 'pad' and `padding` is not equal to (0, 0, 0, 0).
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> net = nn.Conv2dTranspose(3, 64, 4, has_bias=False, weight_init='normal', pad_mode='pad')
>>> x = Tensor(np.ones([1, 3, 16, 50]), mindspore.float32)
>>> output = net(x).shape
>>> print(output)
(1, 64, 19, 53)
"""
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
pad_mode='same',
padding=0,
dilation=1,
group=1,
has_bias=False,
weight_init='normal',
bias_init='zeros'):
"""Initialize Conv2dTranspose."""
kernel_size = twice(kernel_size)
stride = twice(stride)
dilation = twice(dilation)
Validator.check_value_type('padding', padding, (int, tuple), self.cls_name)
if isinstance(padding, tuple):
Validator.check_equal_int(len(padding), 4, 'padding size', self.cls_name)
# out_channels and in_channels swap.
# cause Conv2DBackpropInput's out_channel refers to Conv2D's out_channel,
# then Conv2dTranspose's out_channel refers to Conv2DBackpropInput's in_channel.
super(Conv2dTranspose, self).__init__(
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init,
transposed=True)
self.in_channels = in_channels
self.out_channels = out_channels
self.shape = P.Shape()
Validator.check_string(pad_mode, ['valid', 'same', 'pad'], 'pad_mode', self.cls_name)
self.is_valid = self.pad_mode == 'valid'
self.is_same = self.pad_mode == 'same'
self.is_pad = self.pad_mode == 'pad'
if Validator.check_bool(has_bias, "has_bias", self.cls_name):
self.bias = Parameter(initializer(bias_init, [out_channels]), name='bias')
# cause Conv2DTranspose's out_channel refers to Conv2D's out_channel.
self.conv2d_transpose = P.Conv2DTranspose(out_channel=in_channels,
kernel_size=kernel_size,
mode=1,
pad_mode=pad_mode,
pad=padding,
stride=stride,
dilation=dilation,
group=group)
self.bias_add = P.BiasAdd()
if isinstance(self.padding, int):
self.padding_top, self.padding_bottom, self.padding_left, self.padding_right = (self.padding,) * 4
else:
self.padding_top, self.padding_bottom, self.padding_left, self.padding_right = self.padding
def shard(self, strategy):
self.conv2d_transpose.shard(strategy)
return self
def construct(self, x):
n, _, h, w = self.shape(x)
h_out = _deconv_output_length(self.is_valid, self.is_same, self.is_pad, h, self.kernel_size[0],
self.stride[0], self.dilation[0], self.padding_top + self.padding_bottom)
w_out = _deconv_output_length(self.is_valid, self.is_same, self.is_pad, w, self.kernel_size[1],
self.stride[1], self.dilation[1], self.padding_left + self.padding_right)
if self.has_bias:
return self.bias_add(self.conv2d_transpose(x, self.weight, (n, self.out_channels, h_out, w_out)),
self.bias)
return self.conv2d_transpose(x, self.weight, (n, self.out_channels, h_out, w_out))
def extend_repr(self):
s = 'input_channels={}, output_channels={}, kernel_size={}, ' \
'stride={}, pad_mode={}, padding={}, dilation={}, ' \
'group={}, has_bias={}, ' \
'weight_init={}, bias_init={}'.format(self.in_channels,
self.out_channels,
self.kernel_size,
self.stride,
self.pad_mode,
self.padding,
self.dilation,
self.group,
self.has_bias,
self.weight_init,
self.bias_init)
return s
[docs]class Conv1dTranspose(_Conv):
r"""
1D transposed convolution layer.
Compute a 1D transposed convolution, which is also known as a deconvolution
(although it is not an actual deconvolution).
This module can be seen as the gradient of Conv1d with respect to its input.
`x` is typically of shape :math:`(N, C, W)`, where :math:`N` is batch size, :math:`C` is channel number and
:math:`W` is the characteristic length.
The padding argument effectively adds :math:`dilation * (kernel\_size - 1) - padding` amount of zero padding to
both sizes of the input. So that when a Conv1d and a ConvTranspose1d are initialized with same parameters,
they are inverses of each other in regard to the input and output shapes. However, when stride > 1,
Conv1d maps multiple input shapes to the same output shape.
The width of output is defined as:
.. math::
W_{out} = \begin{cases}
(W_{in} - 1) \times \text{stride} - 2 \times \text{padding} + \text{dilation} \times
(\text{ks_w} - 1) + 1, & \text{if pad_mode='pad'}\\
(W_{in} + \text{stride} - 1)/\text{stride}, & \text{if pad_mode='same'}\\
(W_{in} - 1) \times \text{stride} + \text{dilation} \times
(\text{ks_w} - 1) + 1, & \text{if pad_mode='valid'}
\end{cases}
where :math:`\text{ks_w}` is the width of the convolution kernel.
Args:
in_channels (int): The number of channels in the input space.
out_channels (int): The number of channels in the output space.
kernel_size (int): int, which specifies the width of the 1D convolution window.
stride (int): The distance of kernel moving, an int number that represents
the width of movement. Default: 1.
pad_mode (str): Select the mode of the pad. The optional values are
"pad", "same", "valid". Default: "same".
- pad: Implicit paddings on both sides of the input `x`.
- same: Adopted the way of completion.
- valid: Adopted the way of discarding.
padding (int): Implicit paddings on both sides of the input `x`. Default: 0.
dilation (int): The data type is int. 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 or equal to 1 and bounded by the width of the
input `x`. Default: 1.
group (int): Splits filter into groups, `in_channels` and `out_channels` must be
divisible by the number of groups. This is not support for Davinci devices when group > 1. Default: 1.
has_bias (bool): Specifies whether the layer uses a bias vector. Default: False.
weight_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the convolution kernel.
It can be a Tensor, a string, an Initializer or a numbers.Number. When a string is specified,
values from 'TruncatedNormal', 'Normal', 'Uniform', 'HeUniform' and 'XavierUniform' distributions as well
as constant 'One' and 'Zero' distributions are possible. Alias 'xavier_uniform', 'he_uniform', 'ones'
and 'zeros' are acceptable. Uppercase and lowercase are both acceptable. Refer to the values of
Initializer for more details. Default: 'normal'.
bias_init (Union[Tensor, str, Initializer, numbers.Number]): Initializer for the bias vector. Possible
Initializer and string are the same as 'weight_init'. Refer to the values of
Initializer for more details. Default: 'zeros'.
Inputs:
- **x** (Tensor) - Tensor of shape :math:`(N, C_{in}, W_{in})`.
Outputs:
Tensor of shape :math:`(N, C_{out}, W_{out})`.
Raises:
TypeError: If `in_channels`, `out_channels`, `kernel_size`, `stride`, `padding` or `dilation` is not an int.
ValueError: If `in_channels`, `out_channels`, `kernel_size`, `stride` or `dilation` is less than 1.
ValueError: If `padding` is less than 0.
ValueError: If `pad_mode` is not one of 'same', 'valid', 'pad'.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> net = nn.Conv1dTranspose(3, 64, 4, has_bias=False, weight_init='normal', pad_mode='pad')
>>> x = Tensor(np.ones([1, 3, 50]), mindspore.float32)
>>> output = net(x).shape
>>> print(output)
(1, 64, 53)
"""
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride=1,
pad_mode='same',
padding=0,
dilation=1,
group=1,
has_bias=False,
weight_init='normal',
bias_init='zeros'):
"""Initialize Conv1dTranspose."""
Validator.check_value_type("kernel_size", kernel_size, [int], self.cls_name)
Validator.check_value_type("stride", stride, [int], self.cls_name)
Validator.check_value_type("padding", padding, [int], self.cls_name)
Validator.check_value_type("dilation", dilation, [int], self.cls_name)
Validator.check_int(kernel_size, 1, Rel.GE, 'kernel_size', self.cls_name)
Validator.check_int(stride, 1, Rel.GE, 'stride', self.cls_name)
Validator.check_non_negative_int(padding, 'padding', self.cls_name)
Validator.check_int(dilation, 1, Rel.GE, 'dilation', self.cls_name)
kernel_size = (1, kernel_size)
stride = (1, stride)
dilation = (1, dilation)
get_shape = P.Shape()
get_dtype = P.DType()
if isinstance(weight_init, Tensor):
weight_init_shape = get_shape(weight_init)
Validator.check_equal_int(len(weight_init_shape), 3, 'weight_init_shape', self.cls_name)
weight_init_dtype = get_dtype(weight_init)
weight_init_value = weight_init.asnumpy()
weight_init_value = np.expand_dims(weight_init_value, 2)
weight_init = Tensor(weight_init_value, weight_init_dtype)
# out_channels and in_channels swap.
# cause Conv2DBackpropInput's out_channel refers to Conv2D's out_channel,
# then Conv1dTranspose's out_channel refers to Conv2DBackpropInput's in_channel.
super(Conv1dTranspose, self).__init__(
in_channels,
out_channels,
kernel_size,
stride,
pad_mode,
padding,
dilation,
group,
has_bias,
weight_init,
bias_init,
transposed=True)
self.padding = (0, 0, padding, padding)
self.in_channels = in_channels
self.out_channels = out_channels
self.shape = P.Shape()
Validator.check_string(pad_mode, ['valid', 'same', 'pad'], 'pad_mode', self.cls_name)
self.is_valid = self.pad_mode == 'valid'
self.is_same = self.pad_mode == 'same'
self.is_pad = self.pad_mode == 'pad'
if Validator.check_bool(has_bias, "has_bias", self.cls_name):
self.bias = Parameter(initializer(bias_init, [out_channels]), name='bias')
# cause Conv2DBackpropInput's out_channel refers to Conv2D's out_channel.
self.conv2d_transpose = P.Conv2DBackpropInput(out_channel=in_channels,
kernel_size=kernel_size,
mode=1,
pad_mode=pad_mode,
pad=self.padding,
stride=stride,
dilation=dilation,
group=group)
self.bias_add = P.BiasAdd()
self.expand_dims = P.ExpandDims()
self.squeeze = P.Squeeze(2)
def shard(self, strategy):
self.conv2d_transpose.shard(strategy)
return self
def construct(self, x):
x_shape = self.shape(x)
_check_input_3d(x_shape, self.cls_name)
x = self.expand_dims(x, 2)
n, _, h, w = self.shape(x)
h_out = _deconv_output_length(self.is_valid, self.is_same, self.is_pad, h, self.kernel_size[0],
self.stride[0], self.dilation[0], self.padding[0] + self.padding[1])
w_out = _deconv_output_length(self.is_valid, self.is_same, self.is_pad, w, self.kernel_size[1],
self.stride[1], self.dilation[1], self.padding[2] + self.padding[3])
output = self.conv2d_transpose(x, self.weight, (n, self.out_channels, h_out, w_out))
if self.has_bias:
output = self.bias_add(output, self.bias)
output = self.squeeze(output)
return output
def extend_repr(self):
s = 'input_channels={}, output_channels={}, kernel_size={}, ' \
'stride={}, pad_mode={}, padding={}, dilation={}, ' \
'group={}, has_bias={}, ' \
'weight_init={}, bias_init={}'.format(self.in_channels,
self.out_channels,
self.kernel_size,
self.stride,
self.pad_mode,
self.padding,
self.dilation,
self.group,
self.has_bias,
self.weight_init,
self.bias_init)
return s