def scoreIteration(jsonDump):
  """Helper function to evaluate the overall performance of a single evaluation.
  Currently, we evaluate the performance of an iteration based on the harmonic 
  mean of MI and SC accurcy. 

  Args:
    jsonDump: The jsonDump that is written to the json output file, containing 
      all the computed metrics for the currently considered global step 
      
  Output:
    The harmonic mean of MI and SC accuracy.
  """
  
  hm = lambda x,y: 2*x*y / (x+y)
  
  return hm(jsonDump['MI Accuracy'], jsonDump['SC Accuracy'])