mirror of
https://github.com/fxsjy/jieba.git
synced 2025-07-10 00:01:33 +08:00
102 lines
2.7 KiB
Python
102 lines
2.7 KiB
Python
import re
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import os
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import marshal
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import sys
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MIN_FLOAT = -3.14e100
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PROB_START_P = "prob_start.p"
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PROB_TRANS_P = "prob_trans.p"
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PROB_EMIT_P = "prob_emit.p"
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PrevStatus = {
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'B':('E','S'),
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'M':('M','B'),
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'S':('S','E'),
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'E':('B','M')
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}
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def load_model():
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_curpath = os.path.normpath(os.path.join(os.getcwd(), os.path.dirname(__file__)))
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start_p = {}
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abs_path = os.path.join(_curpath, PROB_START_P)
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with open(abs_path, 'rb') as f:
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start_p = marshal.load(f)
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trans_p = {}
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abs_path = os.path.join(_curpath, PROB_TRANS_P)
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with open(abs_path, 'rb') as f:
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trans_p = marshal.load(f)
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emit_p = {}
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abs_path = os.path.join(_curpath, PROB_EMIT_P)
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with open(abs_path, 'rb') as f:
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emit_p = marshal.load(f)
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return start_p, trans_p, emit_p
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if sys.platform.startswith("java"):
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start_P, trans_P, emit_P = load_model()
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else:
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from . import prob_start,prob_trans,prob_emit
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start_P, trans_P, emit_P = prob_start.P, prob_trans.P, prob_emit.P
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def viterbi(obs, states, start_p, trans_p, emit_p):
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V = [{}] #tabular
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path = {}
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for y in states: #init
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V[0][y] = start_p[y] + emit_p[y].get(obs[0],MIN_FLOAT)
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path[y] = [y]
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for t in range(1,len(obs)):
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V.append({})
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newpath = {}
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for y in states:
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em_p = emit_p[y].get(obs[t],MIN_FLOAT)
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(prob,state ) = max([(V[t-1][y0] + trans_p[y0].get(y, MIN_FLOAT) + em_p, y0) for y0 in PrevStatus[y]])
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V[t][y] = prob
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newpath[y] = path[state] + [y]
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path = newpath
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(prob, state) = max([(V[len(obs)-1][y], y) for y in ('E','S')])
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return (prob, path[state])
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def __cut(sentence):
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global emit_P
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prob, pos_list = viterbi(sentence, ('B','M','E','S'), start_P, trans_P, emit_P)
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begin, next = 0,0
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#print pos_list, sentence
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for i,char in enumerate(sentence):
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pos = pos_list[i]
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if pos == 'B':
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begin = i
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elif pos == 'E':
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yield sentence[begin:i+1]
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next = i+1
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elif pos == 'S':
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yield char
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next = i+1
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if next < len(sentence):
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yield sentence[next:]
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def cut(sentence):
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if not isinstance(sentence, str):
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try:
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sentence = sentence.decode('utf-8')
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except UnicodeDecodeError:
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sentence = sentence.decode('gbk', 'ignore')
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re_han, re_skip = re.compile("([\u4E00-\u9FA5]+)"), re.compile("(\d+\.\d+|[a-zA-Z0-9]+)")
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blocks = re_han.split(sentence)
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for blk in blocks:
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if re_han.match(blk):
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for word in __cut(blk):
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yield word
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else:
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tmp = re_skip.split(blk)
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for x in tmp:
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if x:
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yield x
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