wehub-resource-sync
68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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import unicodedata
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from fairseq.dataclass import ChoiceEnum
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class EvaluationTokenizer(object):
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"""A generic evaluation-time tokenizer, which leverages built-in tokenizers
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in sacreBLEU (https://github.com/mjpost/sacrebleu). It additionally provides
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lowercasing, punctuation removal and character tokenization, which are
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applied after sacreBLEU tokenization.
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Args:
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tokenizer_type (str): the type of sacreBLEU tokenizer to apply.
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lowercase (bool): lowercase the text.
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punctuation_removal (bool): remove punctuation (based on unicode
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category) from text.
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character_tokenization (bool): tokenize the text to characters.
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"""
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SPACE = chr(32)
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SPACE_ESCAPE = chr(9601)
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ALL_TOKENIZER_TYPES = ChoiceEnum(["none", "13a", "intl", "zh", "ja-mecab"])
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def __init__(
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self,
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tokenizer_type: str = "13a",
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lowercase: bool = False,
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punctuation_removal: bool = False,
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character_tokenization: bool = False,
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):
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from sacrebleu.tokenizers import TOKENIZERS
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assert tokenizer_type in TOKENIZERS, f"{tokenizer_type}, {TOKENIZERS}"
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self.lowercase = lowercase
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self.punctuation_removal = punctuation_removal
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self.character_tokenization = character_tokenization
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self.tokenizer = TOKENIZERS[tokenizer_type]
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@classmethod
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def remove_punctuation(cls, sent: str):
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"""Remove punctuation based on Unicode category."""
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return cls.SPACE.join(
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t
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for t in sent.split(cls.SPACE)
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if not all(unicodedata.category(c)[0] == "P" for c in t)
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)
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def tokenize(self, sent: str):
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tokenized = self.tokenizer()(sent)
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if self.punctuation_removal:
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tokenized = self.remove_punctuation(tokenized)
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if self.character_tokenization:
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tokenized = self.SPACE.join(
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list(tokenized.replace(self.SPACE, self.SPACE_ESCAPE))
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)
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if self.lowercase:
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tokenized = tokenized.lower()
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return tokenized
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