fix ctc beamsearch

lyblsgo

2023-01-18 9b5388fae9c8ece84d5440279c90841514e9d52b

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7