update m2met2 doc & baseline (#675)

yhliang

2023-06-28 3cc7403b687e4c9832885df3caaea181894a512f

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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)