code: def __init__(self, n=4, verbose=0):
      # default compute Blue score up to 4
      self._n = n
      self._hypo_for_image = {}
      self.ref_for_image = {}
      self.verbose = verbose
  
imports: from .bleu_scorer import BleuScorer
label_desc: Use image node_id 1 to create a new Bleu object  with example: obj = Bleu(n, verbose)