add bpemodel in build_trainer

北念

2023-10-30 63b980b03027b7b0c56b32fcab6b2805fd64d79d

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beam_size: 5
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7