update infer func for old contextual

shixian.shi

2023-07-06 5690a8bcb314ee53a5db1c704f6e3fe61460c7f6

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