class_docstr: Base class for BLEU & NIST, providing tokenization and some basic n-gram matching
  functions.
docstr: Reset the object, zero all counters.
docstr_tok: ["Reset","the","object",",","zero","all","counters","."]
code: def reset(self):
      """Reset the object, zero all counters."""
      raise NotImplementedError()
  
imports: from __future__ import unicode_literals
  from __future__ import division
  from builtins import zip
  from builtins import range
  from past.utils import old_div
  from builtins import object
  from collections import defaultdict
  import math
  import re
label_desc: Use image node_id 2 for calling the NGramScore obj's underlying member method code with example usage: obj.reset() without return types