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Fix character-based tokenization for Japanese

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This commit is contained in:
Matthew Honnibal 2018-08-27 01:51:38 +02:00
parent 3763e20afc
commit 598dbf1ce0
1 changed files with 23 additions and 7 deletions
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30
spacy/lang/ja/__init__.py
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@ -5,6 +5,7 @@ from ...language import Language
from ...attrs import LANG from ...attrs import LANG
from ...tokens import Doc, Token from ...tokens import Doc, Token
from ...tokenizer import Tokenizer from ...tokenizer import Tokenizer
from ... import util
from .tag_map import TAG_MAP from .tag_map import TAG_MAP
import re import re
@ -12,15 +13,14 @@ from collections import namedtuple
ShortUnitWord = namedtuple('ShortUnitWord', ['surface', 'lemma', 'pos']) ShortUnitWord = namedtuple('ShortUnitWord', ['surface', 'lemma', 'pos'])
# XXX Is this the right place for this?
Token.set_extension('mecab_tag', default=None)
def try_mecab_import(): def try_mecab_import():
"""Mecab is required for Japanese support, so check for it. """Mecab is required for Japanese support, so check for it.
It it's not available blow up and explain how to fix it.""" It it's not available blow up and explain how to fix it."""
try: try:
import MeCab import MeCab
# XXX Is this the right place for this?
Token.set_extension('mecab_tag', default=None)
return MeCab return MeCab
except ImportError: except ImportError:
raise ImportError("Japanese support requires MeCab: " raise ImportError("Japanese support requires MeCab: "
@ -50,7 +50,7 @@ def resolve_pos(token):
def detailed_tokens(tokenizer, text): def detailed_tokens(tokenizer, text):
"""Format Mecab output into a nice data structure, based on Janome.""" """Format Mecab output into a nice data structure, based on Janome."""
tokenizer.parse(text)
node = tokenizer.parseToNode(text) node = tokenizer.parseToNode(text)
node = node.next # first node is beginning of sentence and empty, skip it node = node.next # first node is beginning of sentence and empty, skip it
words = [] words = []
@ -102,12 +102,28 @@ class JapaneseTokenizer(object):
class JapaneseCharacterSegmenter(object): class JapaneseCharacterSegmenter(object):
def __init__(self, vocab): def __init__(self, vocab):
self.vocab = vocab self.vocab = vocab
self._presegmenter = self._make_presegmenter(self.vocab)
def _make_presegmenter(self, vocab):
rules = Japanese.Defaults.tokenizer_exceptions
token_match = Japanese.Defaults.token_match
prefix_search = (util.compile_prefix_regex(Japanese.Defaults.prefixes).search
if Japanese.Defaults.prefixes else None)
suffix_search = (util.compile_suffix_regex(Japanese.Defaults.suffixes).search
if Japanese.Defaults.suffixes else None)
infix_finditer = (util.compile_infix_regex(Japanese.Defaults.infixes).finditer
if Japanese.Defaults.infixes else None)
return Tokenizer(vocab, rules=rules,
prefix_search=prefix_search,
suffix_search=suffix_search,
infix_finditer=infix_finditer,
token_match=token_match)
def __call__(self, text): def __call__(self, text):
words = [] words = []
spaces = [] spaces = []
doc = self.tokenizer(text) doc = self._presegmenter(text)
for token in self.tokenizer(text): for token in doc:
words.extend(list(token.text)) words.extend(list(token.text))
spaces.extend([False]*len(token.text)) spaces.extend([False]*len(token.text))
spaces[-1] = bool(token.whitespace_) spaces[-1] = bool(token.whitespace_)
@ -125,7 +141,7 @@ class JapaneseDefaults(Language.Defaults):
if cls.use_janome: if cls.use_janome:
return JapaneseTokenizer(cls, nlp) return JapaneseTokenizer(cls, nlp)
else: else:
return JapaneseCharacterSegmenter(cls, nlp.vocab) return JapaneseCharacterSegmenter(nlp.vocab)
class Japanese(Language): class Japanese(Language):
lang = 'ja' lang = 'ja'