update m2met2 (#543)

yhliang

2023-05-24 72b2f1a02331328aba9d4a2442ff9e36b7c7dc0a

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