forked from huawei/mindspore2022
79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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"""Cell of auto parallel"""
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from mindspore.nn.cell import Cell
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from mindspore.ops.operations.comm_ops import AllGather
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from mindspore.communication import GlobalComm
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_allgather_cell = None
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class AllGatherCell(Cell):
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"""
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Allgather cell, used in model parallel scenario.
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To allgather the selected parameter slice from each device.
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"""
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def __init__(self, group):
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super(AllGatherCell, self).__init__(auto_prefix=False)
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self.allgather = AllGather(group)
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def construct(self, x):
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x = self.allgather(x)
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return x
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class SaveOptShardCkptCell(Cell):
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"""
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Allgather cell, used in optimizer parallel scenario.
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Firstly gather the tensor to original layout in the specified device group.
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Then gather the whole parameter slices from all devices.
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Note:
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This could be optimized later with less communication consumption.
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"""
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def __init__(self, group):
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super(SaveOptShardCkptCell, self).__init__(auto_prefix=False)
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self.allgather1 = AllGather(group)
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self.allgather2 = AllGather()
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def construct(self, x):
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x = self.allgather1(x)
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x = self.allgather2(x)
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return x
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def get_allgather_cell(group, need_merge_twice=False):
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"""Get AllGatherCell object."""
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global _allgather_cell
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if need_merge_twice:
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_allgather_cell = SaveOptShardCkptCell(group)
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else:
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if group:
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_allgather_cell = AllGatherCell(group)
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else:
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_allgather_cell = AllGatherCell(GlobalComm.WORLD_COMM_GROUP)
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return _allgather_cell
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def destroy_allgather_cell():
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"""Destroy AllGatherCell object."""
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global _allgather_cell
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if _allgather_cell:
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_allgather_cell = None
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