# Copyright 2020 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.
# ============================================================================
"""Parameter for cell."""
from copy import copy
from .._c_expression import ParamInfo
from . import dtype as mstype
from .initializer import initializer, Initializer
from .tensor import Tensor, MetaTensor
from .._checkparam import _check_str_by_regular
from ..parallel._tensor import _get_slice_index
from ..parallel._auto_parallel_context import auto_parallel_context
from ..parallel._ps_context import _is_role_worker, _is_role_pserver, _is_role_sched
__all__ = ['Parameter', 'ParameterTuple']
PARAMETER_NAME_DEFAULT = "Parameter"
PARAMETER_NAME_PREFIX_MAX_LEN = 1024
def _is_in_parallel_mode():
"""Get parallel mode."""
return auto_parallel_context().get_parallel_mode() in ["semi_auto_parallel", "auto_parallel"]
[docs]class Parameter(MetaTensor):
"""
Parameter types of cell models.
After initialized `Parameter` is a subtype of `Tensor`.
In auto_parallel mode of "semi_auto_parallel" and "auto_parallel", if init `Parameter` by
an `Initializer`, the type of Parameter will be `MetaTensor` not `Tensor`. `MetaTensor`
only saves the shape and type info of a tensor with no memory usage. The shape can be changed while
compiling for auto-parallel. Call `init_data` will return a Tensor Parameter with initialized data.
Note:
Each parameter of Cell is represented by Parameter class.
A Parameter has to belong to a Cell.
If there is an operator in the network that requires part of the inputs to be Parameter,
then the Parameters as this part of the inputs are not allowed to be cast.
Args:
default_input (Union[Tensor, Initializer, Number]): Parameter data, to be set initialized.
name (str): Name of the child parameter.
requires_grad (bool): True if the parameter requires gradient. Default: True.
layerwise_parallel (bool): A kind of model parallel mode. When layerwise_parallel is true in parallel mode,
broadcast and gradients communication would not be applied to parameters. Default: False.
Example:
>>> from mindspore import Parameter, Tensor
>>> from mindspore.common import initializer as init
>>> from mindspore.ops import operations as P
>>> from mindspore.nn import Cell
>>> import mindspore
>>> import numpy as np
>>> from mindspore import context
>>>
>>> class Net(Cell):
>>> def __init__(self):
>>> super(Net, self).__init__()
>>> self.matmul = P.MatMul()
>>> self.weight = Parameter(Tensor(np.ones((1,2))), name="w", requires_grad=True)
>>>
>>> def construct(self, x):
>>> out = self.matmul(self.weight, x)
>>> return out
>>> context.set_context(mode=context.GRAPH_MODE, device_target="CPU")
>>> net = Net()
>>> x = Tensor(np.ones((2,1)))
>>> net(x)
[[2.]]
>>> net.weight.set_data(Tensor(np.zeros((1,2))))
>>> net(x)
[[0.]]
"""
__base_type__ = {}
def __new__(cls, default_input, name, *args, **kwargs):
input_class, *class_init_args = Parameter._get_parameter_new_args(default_input)
new_type = Parameter._get_base_class(input_class)
obj = input_class.__new__(new_type)
input_class.__init__(obj, *class_init_args)
# it's better to make the Initializer a kind of metatensor.
obj.init_mode = None
obj.is_default_input_initializer = False
if isinstance(default_input, Initializer):
obj.is_default_input_initializer = True
if not isinstance(obj, Tensor):
obj.init_mode = default_input
return obj
def __reduce_ex__(self, _):
data = self
if self.init_mode is not None:
data = self.init_mode
else:
# cast to break deep infinit loop while deepcopy
data = Tensor(self)
return (
Parameter, (data, self.name, self.requires_grad, self.layerwise_parallel))
def __init__(self, default_input, name, requires_grad=True, layerwise_parallel=False):
self._param_info = ParamInfo()
self.name = name
self.requires_grad = requires_grad
self.layerwise_parallel = layerwise_parallel
# this flag for tensor copy data.
self.init_flag = False
# this flag is for ge variable copy data.
self._is_init = False
self._inited_param = None
self._sliced = False
self.is_param_ps = False
self._cast_type = None
self.init_in_server = False
self.is_in_parallel = _is_in_parallel_mode()
@staticmethod
def _get_base_class(input_class):
input_class_name = f'Parameter{input_class.__name__}'
if input_class_name in Parameter.__base_type__:
new_type = Parameter.__base_type__[input_class_name]
else:
new_type = type(input_class_name, (Parameter, input_class), {})
Parameter.__base_type__[input_class_name] = new_type
return new_type
@staticmethod
def _get_parameter_new_args(data):
"""Set `set_data` of current `Parameter`."""
if isinstance(data, bool):
raise ValueError('Parameter data can not be `bool`')
if isinstance(data, Initializer):
if _is_in_parallel_mode():
# do not init data while in auto parallel.
return (MetaTensor, data.dtype, data.shape)
data = data.to_tensor()
if isinstance(data, Tensor):
# make a copy of Tensor to init the parameter
return (Tensor, data.asnumpy(),)
if isinstance(data, int):
return (Tensor, data, mstype.int32)
if isinstance(data, float):
return (Tensor, data, mstype.float32)
return (Tensor, data)
def __str__(self):
value_str = MetaTensor.__str__(self)
if isinstance(self, Tensor):
value_str = Tensor.__str__(self)
return f'Parameter (name={self._param_info.name}, value={value_str})'
def __repr__(self):
value_str = MetaTensor.__repr__(self)
if isinstance(self, Tensor):
value_str = Tensor.__repr__(self)
return f'Parameter (name={self._param_info.name}, value={value_str})'
def __parameter__(self):
"""For parse check."""
def set_param_ps(self, init_in_server=False):
if _is_role_worker() or _is_role_pserver() or _is_role_sched():
self.is_param_ps = True
self.init_in_server = init_in_server
else:
raise RuntimeError("Must complete following two steps before calling set_param_ps: \
1. set_ps_context(enable_ps=True) \
2. export MS_ROLE environment variable.")
@property
def inited_param(self):
"""
Get the new parameter after call the init_data.
Default is a None, If `self` is a Parameter with out data, after call the
`init_data` the initialized Parameter with data will be recorded here.
"""
return self._inited_param
@property
def name(self):
"""Get the name of the parameter."""
return self._param_info.name
@name.setter
def name(self, name_):
"""
Define a name for the parameter.
Args:
name_ (`str` or `None`): The name of the parameter. When the parameter is None or an empty string,
the default value `PARAMETER_NAME_DEFAULT` is used.
"""
if name_ is None:
name_ = PARAMETER_NAME_DEFAULT
elif isinstance(name_, str):
name_ = name_.strip()
if name_ == '':
name_ = PARAMETER_NAME_DEFAULT
if len(name_) > PARAMETER_NAME_PREFIX_MAX_LEN:
raise ValueError("The length of the '{}' name should be less than {}.".
format(name_, PARAMETER_NAME_PREFIX_MAX_LEN))
else:
raise ValueError("The type of the name should be `str` or `None`.")
self._param_info.name = name_
@property
def sliced(self):
"""Get slice status of the parameter."""
return self._sliced
@sliced.setter
def sliced(self, sliced_):
self._sliced = sliced_
@property
def is_init(self):
"""
Get the initialization status of the parameter.
In GE backend, the Parameter need a "init graph" to sync the data from host to device.
This flag indicates whether the data as been sync to the device.
This flag only work in GE, and it will be set to False in other backend.
"""
return self._is_init
@is_init.setter
def is_init(self, is_init_):
"""
Set init status of the parameter.
Args:
is_init_ (bool): The init status of the parameter.
"""
self._is_init = is_init_
[docs] def clone(self, prefix, init='same'):
"""
Clone the parameter.
Args:
prefix (str): Namespace of parameter. The cloned Parameter name is
combined of prefix and current name: `f"{perfix}.{self.name}"`.
init (Union[Tensor, str, Initializer, numbers.Number]): Initialize the shape of the parameter.
Default: 'same'.
Returns:
Parameter, a new parameter.
"""
_check_str_by_regular(prefix)
x = copy(self)
# pylint: disable=protected-access
x._param_info = self._param_info.clone()
x._param_info.name = prefix + '.' + self._param_info.name
x.is_init = False
if init != 'same':
shape = self.shape
dtype = self.dtype
x.set_data(initializer(init, shape=shape, dtype=dtype))
return x
@property
def layerwise_parallel(self):
return self._param_info.layerwise_parallel
@layerwise_parallel.setter
def layerwise_parallel(self, value=True):
if not isinstance(value, bool):
raise TypeError("`layerwise_parallel` parameter must be bool type")
self._param_info.layerwise_parallel = value
@property
def requires_grad(self):
"""Return whether the parameter requires gradient."""
return self._param_info.requires_grad
@requires_grad.setter
def requires_grad(self, value=True):
if not isinstance(value, bool):
raise TypeError("`requires_grad` parameter must be bool type")
self._param_info.requires_grad = value
@property
def data(self):
return self
def _update_tensor_data(self, data):
"Update the parameter by a Tensor."
if isinstance(self, Tensor):
# for Tensor same shape:
self.init_flag = False
return self.assign_value(data)
# create a new tensor
return Parameter(data, self.name, self.requires_grad)
[docs] def set_data(self, data, slice_shape=False):
"""
Set `set_data` of current `Parameter`.
Args:
data (Union[Tensor, Initializer, int, float]): new data.
slice_shape (bool): If slice the Parameter, will not check if shape is match. Default: False.
Retruns:
Parameter, the parameter after set data.
"""
def raise_type_error(incoming):
raise TypeError(f"Incoming Parameter dtype can not be converted to current dtype implicitly. "
f"Current dtype is {self.dtype}, and incoming is {incoming}. "
f"Use .set_dtype(xxx) to change the dtype.")
if not isinstance(data, (MetaTensor, Initializer, int, float)):
raise TypeError(f"Parameter data must be [`Initializer`, `int`, `float`] or a kind of `MetaTensor` "
f"(like `Tensor` or `MetaTensor`). But with type {type(data)}.")
if isinstance(data, (int, float)):
if self.dtype in mstype.int_type and isinstance(data, float):
raise_type_error(mstype.float_)
data = Tensor(data, self.dtype)
# both not init.
is_incoming_tensor = isinstance(data, Tensor)
is_current_tensor = isinstance(self, Tensor)
if is_incoming_tensor and not is_current_tensor:
raise TypeError("Parameter is a `MetaTensor` and not initializered, `data` for `set_data`"
"should be a Initializer. If you want to update it by Tensor, call method"
"`init_parameters_data` of `Cell` to init and replace all the Parameter of"
"network, then call this method.")
if tuple(self.shape) != tuple(data.shape):
# If Slice create Parameter shape can be change.
if not slice_shape:
raise ValueError(f"Can not change the shape of Parameter which has been initialized."
f" Current shape is {self.shape}, and incoming is {data.shape}.")
if self.dtype != data.dtype:
if mstype.implicit_conversion_seq[self.dtype] < mstype.implicit_conversion_seq[data.dtype]:
raise_type_error(data.dtype)
else:
data = Tensor(data, self.dtype)
if isinstance(data, Initializer):
# The parameter has been initializered, directly update by the data
if is_current_tensor:
self._update_tensor_data(data.to_tensor())
else:
# also update the related inited parameter data
if self.inited_param is not None:
self.inited_param.set_data(data)
self.init_mode = data
elif is_incoming_tensor or is_current_tensor:
self._update_tensor_data(data)
else:
raise ValueError(f"Not support to update the Parameter by {data}")
self.sliced = slice_shape
return self
[docs] def init_data(self, layout=None, set_sliced=False):
"""
Initialize the parameter data.
Args:
layout (list[list[int]]): Parameter slice layout [dev_mat, tensor_map, slice_shape].
- dev_mat (list[int]): Device matrix.
- tensor_map (list[int]): Tensor map.
- slice_shape (list[int]): Shape of slice.
set_sliced (bool): True if the parameter is set sliced after initializing the data.
Default: False.
Raises:
RuntimeError: If it is from Initializer, and parallel mode has changed after the Initializer created.
Returns:
Parameter, the `Parameter` after initializing data. If current `Parameter` was already initialized before,
returns the same initialized `Parameter`.
"""
if self.is_default_input_initializer:
is_current_in_parallel = _is_in_parallel_mode()
if self.is_in_parallel != is_current_in_parallel:
raise RuntimeError("Must set or change parallel mode before any Initializer created.")
if self.init_mode is None:
return self
if self.inited_param is not None:
return self.inited_param
if layout is not None:
if not isinstance(layout, list):
raise TypeError("The layout should be list! layout is {}.".format(layout))
if len(layout) < 3:
raise ValueError("The length of layout must be larger than 3! layout is {}.".format(layout))
slice_index = int(_get_slice_index(layout[0], layout[1]))
if (self.init_in_server and self.is_param_ps and isinstance(self.init_mode, Initializer)):
data = self.init_mode.to_tensor(0, [1])
else:
data = self.init_mode.to_tensor(slice_index, layout[2])
else:
if (self.init_in_server and self.is_param_ps and isinstance(self.init_mode, Initializer)):
data = self.init_mode.to_tensor(0, [1])
else:
data = self.init_mode.to_tensor()
obj = self._update_tensor_data(data)
if id(obj) != id(self):
self._inited_param = obj
obj.init_mode = None
obj.sliced = set_sliced
return obj
[docs]class ParameterTuple(tuple):
"""
Class for storing tuple of parameters.
Note:
It is used to store the parameters of the network into the parameter tuple collection.
"""
def __new__(cls, iterable):
"""Create instance object of ParameterTuple."""
data = tuple(iterable)
for x in data:
if not isinstance(x, Parameter):
raise TypeError(f"ParameterTuple input should be `Parameter` collection."
f"But got a {type(iterable)}, {iterable}")
return tuple.__new__(ParameterTuple, tuple(data))
[docs] def clone(self, prefix, init='same'):
"""
Clone the parameter.
Args:
prefix (str): Namespace of parameter.
init (str): Initialize the shape of the parameter. Default: 'same'.
Returns:
Tuple, the new Parameter tuple.
"""
_check_str_by_regular(prefix)
new = []
for x in self:
x1 = x.clone(prefix, init)
new.append(x1)
return ParameterTuple(new)
def __parameter_tuple__(self):
"""For parse check."""