wehub-resource-sync
34 lines
1.2 KiB
Python
34 lines
1.2 KiB
Python
# Copyright (c) 2020 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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def sequence_mask(seq_ids, valid_lengths):
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"""
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To boost the performance, this sequence_mask is different with paddle.nn.functional.sequence_mask
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Args:
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seq_ids (Tensor):
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The whole sequence index, a tensor with a shape of [batch_size, sequence_length].
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valid_lengths (Tensor):
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The valid length of every sequence, a tensor with a shape of [batch_size].
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Returns:
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Tensor: Returns the output sequence mask `mask`.
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Its dtype is `bool` and has a shape of [batch_size, sequence_length].
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"""
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lengths_exp = valid_lengths.unsqueeze(1)
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mask = seq_ids < lengths_exp
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return mask
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