Created
July 9, 2018 09:36
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# coding=utf-8 | |
prob_start = [] | |
prob_trans = [] | |
prob_emit = [] | |
MIN_FLOAT = -3.14e100 | |
STATE = {0: "B", 1: "E", 2: "M", 3: "S"} | |
def load_dicts(filename="hmm_model.utf8"): | |
global prob_start, prob_trans | |
with open(filename, "rb") as f: | |
lines = [i.strip() for i in f if i.strip() and not i.startswith("#")] | |
prob_start = [float(i) for i in lines[0].split()] | |
for k in range(1, 5): | |
prob_trans.append([float(i) for i in lines[k].split()]) | |
for k in range(5, 9): | |
prob_emit.append({k: float(v) for k, v in [item.split(":") for item in lines[k].split(",")]}) | |
def viterbi(obs): | |
weight = [[0] * len(obs) for _ in range(4)] | |
path = [[-1] * len(obs) for _ in range(4)] | |
for i in range(4): | |
weight[i][0] = prob_start[i] + prob_emit[i].get(obs[0].encode("utf8"), MIN_FLOAT) | |
for i in range(1, len(obs)): | |
for j in range(4): | |
weight[j][i], path[j][i] = max( | |
[(weight[k][i - 1] + prob_trans[k][j] + prob_emit[j].get(obs[i].encode("utf8"), MIN_FLOAT), k) for k in | |
range(4)]) | |
paths = [] | |
t = 3 if weight[1][-1] < weight[3][-1] else 1 | |
paths.append(3) | |
for i in range(len(obs) - 1, -1, -1): | |
sy = path[t][i] | |
paths.append(sy) | |
t = sy | |
return "".join([STATE[i] for i in paths[-2::-1]]) | |
def add_slash(sentence, pos): | |
print(pos) | |
return "".join( | |
[i + "/" if (pos[index] == "E" or pos[index] == "S") and index + 1 != len(sentence) else i for index, i in | |
enumerate(sentence)]) | |
if __name__ == '__main__': | |
load_dicts(filename="./hmm_model.utf8") # https://github.com/yanyiwu/cppjieba/blob/master/dict/hmm_model.utf8 | |
s = u"小明硕士毕业于中国科学院计算所,研究人工智能" | |
import re | |
pattern = r',|\.|/|;|\'|`|\[|\]|<|>|\?|:|"|\{|\}|\~|!|@|#|\$|%|\^|&|\(|\)|-|=|\_|\+|,|。|、|;|‘|’|【|】|·|!| |…|(|)' | |
for s1 in re.split(pattern, s): | |
print(add_slash(s1, viterbi(s1))) |
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