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35 lines
1.2 KiB
35 lines
1.2 KiB
# 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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import re
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import unicodedata
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from builtins import str as unicode
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from parakeet.frontend.normalizer.numbers import normalize_numbers
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def normalize(sentence):
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""" Normalize English text.
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"""
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# preprocessing
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sentence = unicode(sentence)
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sentence = normalize_numbers(sentence)
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sentence = ''.join(
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char for char in unicodedata.normalize('NFD', sentence)
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if unicodedata.category(char) != 'Mn') # Strip accents
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sentence = sentence.lower()
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sentence = re.sub(r"[^ a-z'.,?!\-]", "", sentence)
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sentence = sentence.replace("i.e.", "that is")
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sentence = sentence.replace("e.g.", "for example")
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return sentence
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