class_docstr: Class for giving abbreviated tags like to objects.
  Only really intended for internal use in order to
  implement min_informative_st 
code: def __init__(self):
      self.cur_tag_number = 0
  
imports: from __future__ import absolute_import, print_function, division
  from copy import copy
  import logging
  import os
  import sys
  import hashlib
  import numpy
  from six import string_types, integer_types, iteritems
  from six.moves import StringIO, reduce
  import theano
  from theano import gof
  from theano import config
  from theano.gof import Op, Apply
  from theano.compile import Function, debugmode, SharedVariable
label_desc: Use image node_id 1 to create a new _TagGenerator object  with example: obj = _TagGenerator()