class_docstr: Bleu scorer.
class_docstr_tok: ["Bleu","scorer","."]
docstr: singular instance
docstr_tok: ["singular","instance"]
code: def __init__(self, test=None, refs=None, n=4, special_reflen=None):
      """singular instance"""
  
      self.n = n
      self.crefs = []
      self.ctest = []
      self.cook_append(test, refs)
      self.special_reflen = special_reflen
  
imports: import copy
  import math
  from builtins import dict, range
  from collections import defaultdict
label_desc: Use image node_id 2 to create a new BleuScorer object from inherited base classes: object with example: obj = BleuScorer(test, refs, n, special_reflen)