rnnt bug fix

aky15

2023-05-09 77045e7bb78d4b8a82f96130f9d84e356a32d5c5

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 1.0
lm_weight: 0.7