fix paraformer finetune bug

北念

2023-11-09 d90de51e76099a308e731e3575f76a71cc684f95

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.