fix large_dataset epoch shuffle bug

haoneng.lhn

2023-09-19 9a7ea0f10e936277674f7e4cd17d4e9616706bff

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