code: def phi4(c1, c2):
      return (
          2 * len([m for m in c1 if m in c2]) / float(len(c1) + len(c2))
      )
  
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 5 for calling a global function with example usage: phi4(c1, c2) and returns: unknown