support offline inference for unified streaming/non-streaming rnnt

aky15

2023-08-14 a5cd4bb473b19fe2af1753fa7e60a997a8208447

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)