# This is the Python alloc contiguous memory handle.
#
# Copyright 2024-2025 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.
# ============================================================================
"""Contiguous memory handle."""
from mindspore.common.tensor import Tensor
from mindspore.common.api import _convert_python_data
from mindspore.common.dtype import type_size_in_bytes
from mindspore._c_expression import slice_by_tensor_index, slice_by_padding_shape, \
combine_tensor_list_contiguous as combine_tensor_list, Tensor as Tensor_
[文档]def combine_tensor_list_contiguous(tensor_list, enable_mem_align=True):
r"""
Return a contiguous memory handle where contiguous memory has been requested and slicing functionality is provided.
Args:
tensor_list (list[Tensor], Tuple[Tensor]): The tensor list to be stored.
enable_mem_align (bool, optional): Whether to enable the memory alignment function.
False is not supported. Default: ``True`` .
Returns:
ContiguousTensorsHandle, a manager with contiguous memory.
Examples:
>>> import numpy as np
>>> import mindspore as ms
>>> from mindspore import Tensor
>>> from mindspore.hal.contiguous_tensors_handle import combine_tensor_list_contiguous
>>> x = Tensor(np.array([1, 2, 3]).astype(np.float32))
>>> y = Tensor(np.array([4, 5, 6]).astype(np.float32))
>>> handle = combine_tensor_list_contiguous([x, y], True)
>>> print(handle[0].shape)
[1]
>>> print(handle[1: 3].asnumpy())
[2, 3]
>>> print(output.slice_by_tensor_index(0, 1).asnumpy())
[1, 2, 3]
"""
return ContiguousTensorsHandle(tensor_list, enable_mem_align)
[文档]class ContiguousTensorsHandle:
r"""
ContiguousTensorsHandle is a handle manage continuous memory.
Args:
tensor_list (list[Tensor], Tuple[Tensor]): The tensor list to be stored.
enable_mem_align (bool, optional): Whether to enable the memory alignment function.
False is not supported. Default: ``True`` .
Returns:
ContiguousTensorsHandle, a manager with contiguous memory.
Examples:
>>> import numpy as np
>>> import mindspore as ms
>>> from mindspore import Tensor
>>> from mindspore.hal.contiguous_tensors_handle import ContiguousTensorsHandle
>>> x = Tensor(np.array([1, 2, 3]).astype(np.float32))
>>> y = Tensor(np.array([4, 5, 6]).astype(np.float32))
>>> handle = ContiguousTensorsHandle([x, y], True)
>>> print(handle[0].shape)
[1]
>>> print(handle[1: 3].asnumpy())
[2, 3]
"""
def __init__(self, tensor_list, enable_mem_align=True):
if isinstance(tensor_list, (list, tuple)):
for tensor in tensor_list:
if not isinstance(tensor, (Tensor, Tensor_)):
raise TypeError(f"input list must be [Tensor, ...].")
if isinstance(tensor_list, list):
self.tensor_list = tuple(tensor_list)
else:
self.tensor_list = tensor_list
else:
raise TypeError(f"input list must be [Tensor, ...].")
if not isinstance(enable_mem_align, bool):
raise TypeError(f"enable_mem_align must be bool.")
padding_sizes_pair = combine_tensor_list(self.tensor_list, enable_mem_align)
self.before_padding_sizes = padding_sizes_pair[0]
self.after_padding_sizes = padding_sizes_pair[1]
self.total_padding_size = sum(self.after_padding_sizes)
self.handle_shape = self.total_padding_size / type_size_in_bytes(self.tensor_list[0].dtype)
self.enable_mem_align = enable_mem_align
def __getitem__(self, item):
"""
item is sliced by shape
:param item:
:return: Tensor
"""
start = 0
end = int(self.handle_shape)
if isinstance(item, slice):
if item.start is not None:
start = item.start
if item.stop is not None:
end = item.stop
if not isinstance(start, int) or not isinstance(end, int):
raise TypeError(f"slice input error.")
if start < 0 or end > self.handle_shape or start >= end:
raise ValueError(f"slice input error.")
return _convert_python_data(slice_by_padding_shape(self.tensor_list[0], start, end))
if not isinstance(item, int):
raise TypeError(f"slice input must be "
f"1.index -> int."
f"2.[start: end: step] -> [int: int: int].")
if item < 0 or item > self.handle_shape:
raise ValueError(f"slice input is out of tensor_list size.")
return _convert_python_data(slice_by_padding_shape(self.tensor_list[0], item, item + 1))
def __str__(self):
list_str = "Handle total size: " + str(self.total_padding_size) + "\n"
index = 0
for tensor in self.tensor_list:
list_str = list_str + "Tensor[" + str(index) + "]: " + str(tensor.asnumpy()) + "\n"
index += 1
return list_str
[文档] def slice_by_tensor_index(self, start=None, end=None):
"""
Return the tensor which is sliced by tensor index.
Args:
start(int, None): Starting position. Default：``None``.
end(int, None): Deadline position. Default：``None``.
Returns:
Tensor，is sliced by tensor index.
Raises:
TypeError: If `start` or `end`, is neither an 'int' nor a 'none'.
ValueError: If values of `start` or `end` are negative, or out of the list range, or start >= end.
Examples:
>>> import numpy as np
>>> import mindspore as ms
>>> from mindspore import Tensor
>>> from mindspore.hal.contiguous_tensors_handle import ContiguousTensorsHandle
>>> x = Tensor(np.array([1, 2, 3]).astype(np.float32))
>>> y = Tensor(np.array([4, 5, 6]).astype(np.float32))
>>> handle = ContiguousTensorsHandle([x, y], True)
>>> print(output.slice_by_tensor_index(0, 1).asnumpy())
[1, 2, 3]
"""
index_start = 0
index_end = len(self.tensor_list)
if start is not None:
index_start = start
if end is None:
index_end = index_start + 1
if end is not None:
index_end = end
if not isinstance(index_start, int) or not isinstance(index_end, int):
raise TypeError(f"slice input error.")
if index_start < 0 or index_end > len(self.tensor_list) or index_start >= index_end:
raise ValueError(f"slice input error.")
return _convert_python_data(slice_by_tensor_index(self.tensor_list, self.before_padding_sizes,
self.after_padding_sizes, index_start, index_end))