code: def mutual_information_calc(response_entropy, conditional_entropy):
      """
      Calculate Mutual information.
  
      :param response_entropy: response entropy
      :type response_entropy: float
      :param conditional_entropy: conditional entropy
      :type conditional_entropy: float
      :return: mutual information as float
      """
      try:
          return response_entropy - conditional_entropy
      except Exception:
          return "None"
  
imports: from __future__ import division
  import math
  import operator
  from functools import reduce
  from .pycm_interpret import *
  from .pycm_ci import kappa_SE_calc, CI_calc, SE_calc
  from .pycm_util import complement
label_desc: Use image node_id 27 for calling a global function with example usage: mutual_information_calc(response_entropy, conditional_entropy) and returns: unknown, str