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# Copyright (c) 2021 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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# Reference chainer MIT (https://opensource.org/licenses/MIT)
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class IntervalTrigger():
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"""A Predicate to do something every N cycle."""
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def __init__(self, period: int, unit: str):
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if unit not in ("iteration", "epoch"):
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raise ValueError("unit should be 'iteration' or 'epoch'")
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if period <= 0:
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raise ValueError("period should be a positive integer.")
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self.period = period
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self.unit = unit
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self.last_index = None
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def __call__(self, trainer):
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if self.last_index is None:
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last_index = getattr(trainer.updater.state, self.unit)
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self.last_index = last_index
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last_index = self.last_index
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index = getattr(trainer.updater.state, self.unit)
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fire = index // self.period != last_index // self.period
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self.last_index = index
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return fire
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