modify rnnt infer

aky15

2023-05-18 6c381c270094b107ab7a7f087f809fc38a1c69a8

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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.