code: def IS_calc(TP, FP, FN, POP):
      
      try:
          result = -math.log(((TP + FN) / POP), 2) + \
              math.log((TP / (TP + FP)), 2)
          return result
      except Exception:
          return "None"
docs: Calculate IS (Information score).
  
      :param TP: true positive
      :type TP : int
      :param FP: false positive
      :type FP : int
      :param FN: false negative
      :type FN : int
      :param POP: population
      :type POP : int
      :return: IS as float