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53 lines
1.8 KiB
53 lines
1.8 KiB
3 years ago
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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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"""This module provides functions to calculate bleu score in different level.
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e.g. wer for word-level, cer for char-level.
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"""
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import numpy as np
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import sacrebleu
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__all__ = ['bleu', 'char_bleu']
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def bleu(hypothesis, reference):
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"""Calculate BLEU. BLEU compares reference text and
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hypothesis text in word-level using scarebleu.
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:param reference: The reference sentences.
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:type reference: list[list[str]]
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:param hypothesis: The hypothesis sentence.
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:type hypothesis: list[str]
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:raises ValueError: If the reference length is zero.
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"""
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return sacrebleu.corpus_bleu(hypothesis, reference)
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def char_bleu(hypothesis, reference):
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"""Calculate BLEU. BLEU compares reference text and
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hypothesis text in char-level using scarebleu.
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:param reference: The reference sentences.
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:type reference: list[list[str]]
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:param hypothesis: The hypothesis sentence.
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:type hypothesis: list[str]
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:raises ValueError: If the reference number is zero.
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"""
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hypothesis =[' '.join(list(hyp.replace(' ', ''))) for hyp in hypothesis]
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reference = [[' '.join(list(ref_i.replace(' ', ''))) for ref_i in ref ]for ref in reference ]
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return sacrebleu.corpus_bleu(hypothesis, reference)
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