class_docstr: Bleu scorer.
class_docstr_tok: ["Bleu","scorer","."]
code: def size(self):
      assert len(self.crefs) == len(
          self.ctest
      ), "refs/test mismatch! %d<>%d" % (
          len(self.crefs),
          len(self.ctest),
      )
      return len(self.crefs)
  
imports: import copy
  import math
  from builtins import dict, range
  from collections import defaultdict
label_desc: Use image node_id 11 for calling the BleuScorer obj's underlying member method code with example usage: obj.size() and returns: len