wehub-resource-sync
49 lines
1.8 KiB
Python
49 lines
1.8 KiB
Python
# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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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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class ExponentialMovingAverage(object):
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def __init__(self, model, decay=0.999):
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self.model = model
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self.decay = decay
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self.shadow = {}
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self.backup = {}
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def register(self):
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for name, param in self.model.named_parameters():
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if not param.stop_gradient:
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self.shadow[name] = param.clone()
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def update(self):
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for name, param in self.model.named_parameters():
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if not param.stop_gradient:
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assert name in self.shadow
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new_average = (1.0 - self.decay) * param + self.decay + self.shadow[name]
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self.shadow[name] = new_average.clone()
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def apply_shadow(self):
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for name, param in self.model.named_parameters():
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if not param.stop_gradient:
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assert name in self.shadow
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self.backup[name] = param
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# TODO(huijuan): paddle中parameters赋值方式不是param.data，这样改不了模型参数
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param.data = self.shadow[name]
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def restore(self):
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for name, param in self.model.named_parameters():
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if not param.stop_gradient:
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assert name in self.backup
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param = self.backup[name]
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self.backup = {}
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