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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import re
from typing import List
try:
import ipadic
import MeCab
HAVE_MECAB = True
HAVE_IPADIC = True
except (ImportError, ModuleNotFoundError):
HAVE_MECAB = False
HAVE_IPADIC = False
class EnJaProcessor:
"""
Tokenizer, Detokenizer and Normalizer utilities for Japanese & English
Args:
lang_id: One of ['en', 'ja'].
"""
def __init__(self, lang_id: str):
from sacremoses import MosesDetokenizer, MosesPunctNormalizer, MosesTokenizer
self.lang_id = lang_id
self.moses_tokenizer = MosesTokenizer(lang=lang_id)
self.moses_detokenizer = MosesDetokenizer(lang=lang_id)
self.normalizer = MosesPunctNormalizer(
lang=lang_id, pre_replace_unicode_punct=True, post_remove_control_chars=True
)
def detokenize(self, tokens: List[str]) -> str:
"""
Detokenizes a list of tokens
Args:
tokens: list of strings as tokens
Returns:
detokenized Japanese or English string
"""
return self.moses_detokenizer.detokenize(tokens)
def tokenize(self, text) -> str:
"""
Tokenizes text using Moses. Returns a string of tokens.
"""
tokens = self.moses_tokenizer.tokenize(text)
return ' '.join(tokens)
def normalize(self, text) -> str:
# Normalization doesn't handle Japanese periods correctly;
# '。'becomes '.'.
if self.lang_id == 'en':
return self.normalizer.normalize(text)
else:
return text
class JaMecabProcessor:
"""
Tokenizer, Detokenizer and Normalizer utilities for Japanese MeCab & English
"""
def __init__(self):
if not HAVE_MECAB or not HAVE_IPADIC:
raise ImportError("Please ensure that you have installed `MeCab` and `ipadic` to use JaMecabProcessor")
self.mecab_tokenizer = MeCab.Tagger(ipadic.MECAB_ARGS + " -Owakati")
def detokenize(self, text: List[str]) -> str:
from pangu import spacing
RE_WS_IN_FW = re.compile(
r'([\u2018\u2019\u201c\u201d\u2e80-\u312f\u3200-\u32ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff\uff00-\uffef])\s+(?=[\u2018\u2019\u201c\u201d\u2e80-\u312f\u3200-\u32ff\u3400-\u4dbf\u4e00-\u9fff\uf900-\ufaff\uff00-\uffef])'
)
detokenize = lambda s: spacing(RE_WS_IN_FW.sub(r'\1', s)).strip()
return detokenize(' '.join(text))
def tokenize(self, text) -> str:
"""
Tokenizes text using Moses. Returns a string of tokens.
"""
return self.mecab_tokenizer.parse(text).strip()
def normalize(self, text) -> str:
return text
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