Update iterable_dataset.py

hnluo

2023-03-10 1eacb8ae811a7e68c296523e6a8b4e72eb024aa2

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