fix speed_perturb bug

haoneng.lhn

2023-06-05 0b729cd5744e514ff95c5c8bc9378136b1ccb750

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beam_size: 5
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7