support resume model from pai (#544)

aky15

2023-05-24 2f9685797b0c8a420574c2a459c242f90efdf3ee

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