fix m2met2 baseline bugs

yhliang

2023-05-18 db77a41e29d5c190d1bbc0d7698e384f14fa8168

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