code: def __init__(self):
      self.total = 1e-6
      self.recalled = 1e-6
      self.predicted = 1e-6
  
      self.word_num = 1e-6
  
imports: import logging
  import numpy
  from collections import Counter, defaultdict
  from scipy.optimize import linear_sum_assignment
  from .blanc import blanc, tuple_to_metric
label_desc: Use image node_id 1 to create a new MentionEvaluator object from inherited base classes: object with example: obj = MentionEvaluator()