23 lines
921 B
Python
23 lines
921 B
Python
# Copyright (c) 2020, NVIDIA CORPORATION. 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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import tensorflow as tf
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__all__ = ['learning_rate_scheduler']
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def learning_rate_scheduler(lr_init, warmup_steps, global_step):
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warmup_lr = (lr_init * tf.cast(global_step, tf.float32) / tf.cast(warmup_steps, tf.float32))
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return tf.cond(global_step < warmup_steps, lambda: warmup_lr, lambda: lr_init)
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