code: def weighted_jaccard(a, b):
      if isinstance(a, list) and isinstance(b, list):
          a = dict(Counter(a))
          b = dict(Counter(b))
  
      a2 = a.copy()
      b2 = b.copy()
  
      numer = 0
      denom = 0
      keys = set(list(a.keys()) + list(b.keys()))
      for k in keys:
          a2.setdefault(k, 0)
          b2.setdefault(k, 0)
          numer += min(a2[k], b2[k])
          denom += max(a2[k], b2[k])
      return 1.0 - float(numer) / denom
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import copy
  import unittest
  import numpy
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  from collections import Counter
  import sys
label_desc: Use image node_id 2 for calling a global function with example usage: weighted_jaccard(a, b) and returns: unknown