code: def normalizer(self, maxweight, top_total):
      raise NotImplementedError
  
imports: from __future__ import division
  import random
  from collections import defaultdict
  from math import log
  from whoosh.compat import xrange, iteritems
label_desc: Use image node_id 2 for calling the ExpansionModel obj's underlying member method code with example usage: obj.normalizer(maxweight, top_total) without return types