update docs for en-bpe models

雾聪

2023-10-10 907966d80b53dcda99c48d4bd005756f4a9f3bbf

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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)