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fix the bug of issue#137

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This commit is contained in:
fxsjy 2014-03-02 17:52:19 +08:00
parent cc708de40c
commit 9d4ac26f16
1 changed files with 2 additions and 1 deletions
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3
jieba/posseg/viterbi.py
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@ -1,5 +1,6 @@
import operator
MIN_FLOAT=-3.14e100
MIN_INF=float("-inf")
def get_top_states(t_state_v,K=4):
items = t_state_v.items()
@ -27,7 +28,7 @@ def viterbi(obs, states, start_p, trans_p, emit_p):
if len(obs_states)==0: obs_states = all_states
for y in obs_states:
(prob,state ) = max([(V[t-1][y0] + trans_p[y0].get(y,MIN_FLOAT) + emit_p[y].get(obs[t],MIN_FLOAT) ,y0) for y0 in prev_states])
(prob,state ) = max([(V[t-1][y0] + trans_p[y0].get(y,MIN_INF) + emit_p[y].get(obs[t],MIN_FLOAT) ,y0) for y0 in prev_states])
V[t][y] =prob
mem_path[t][y] = state