Restore 0.1.5 version from stash

This commit is contained in:
liaibo
2025-12-08 19:56:24 +08:00
parent de189e938d
commit 8db3f4e32d
8578 changed files with 2703426 additions and 217 deletions
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# -*- coding: utf-8 -*-
"""最大正向匹配分词"""
from pypinyin.constants import PHRASES_DICT
class Seg(object):
"""正向最大匹配分词
:type prefix_set: PrefixSet
:param no_non_phrases: 是否严格按照词语分词,不允许把非词语的词当做词语进行分词
:type no_non_phrases: bool
"""
def __init__(self, prefix_set, no_non_phrases=False):
self._prefix_set = prefix_set
self._no_non_phrases = no_non_phrases
def cut(self, text):
"""分词
:param text: 待分词的文本
:yield: 单个词语
"""
remain = text
while remain:
matched = ''
last_valid_word = ''
last_valid_index = 0
# 一次加一个字的匹配
for index in range(len(remain)):
word = remain[:index + 1]
if word in self._prefix_set:
matched = word
# 检查当前匹配的词是否为有效词语
if (not self._no_non_phrases) or word in PHRASES_DICT:
last_valid_word = word
last_valid_index = index + 1
else:
# 前缀匹配失败,需要处理之前的匹配结果
if last_valid_word:
# 有有效词语,输出最后一个有效词语
yield last_valid_word
remain = remain[last_valid_index:]
else:
# 没有有效词语
if self._no_non_phrases:
# 严格模式:输出第一个字符
yield remain[0]
remain = remain[1:]
else:
# 非严格模式:输出匹配到的前缀(如果有)或第一个字符
if matched:
yield matched
remain = remain[len(matched):]
else:
yield remain[0]
remain = remain[1:]
break
else: # 整个剩余文本都能匹配前缀
if last_valid_word:
# 有有效词语,输出最后一个有效词语
yield last_valid_word
remain = remain[last_valid_index:]
else:
# 没有有效词语,处理剩余文本
if self._no_non_phrases and remain not in PHRASES_DICT:
# 严格模式且不在词典中:拆分为单字符
for x in remain:
yield x
else:
# 非严格模式或在词典中:输出整个剩余文本
yield remain
break
def train(self, words):
"""训练分词器
:param words: 词语列表
"""
self._prefix_set.train(words)
class PrefixSet(object):
def __init__(self):
self._set = set()
def train(self, word_s):
"""更新 prefix set
:param word_s: 词语库列表
:type word_s: iterable
:return: None
"""
for word in word_s:
# 把词语的每个前缀更新到 prefix_set 中
for index in range(len(word)):
self._set.add(word[:index + 1])
def __contains__(self, key):
return key in self._set
p_set = PrefixSet()
p_set.train(PHRASES_DICT.keys())
#: 基于内置词库的最大正向匹配分词器。使用:
#:
#: .. code-block:: python
#:
#: >>> from pypinyin.contrib.mmseg import seg
#: >>> text = '你好,我是中国人,我爱我的祖国'
#: >>> seg.cut(text)
#: <generator object Seg.cut at 0x10b2df2b0>
#: >>> list(seg.cut(text))
#: ['你好', '', '我', '是', '中国人', '', '我', '爱',
#: '我的', '祖', '国']
#: >>> seg.train(['祖国', '我是'])
#: >>> list(seg.cut(text))
#: ['你好', '', '我是', '中国人', '', '我', '爱',
#: '我的', '祖国']
#: >>>
seg = Seg(p_set, no_non_phrases=True)
def retrain(seg_instance):
"""重新使用内置词典训练 seg_instance。
比如在增加自定义词语信息后需要调用这个模块重新训练分词器
:type seg_instance: Seg
"""
seg_instance.train(PHRASES_DICT.keys())