code: def CBA_calc(classes, table, TOP, P):
      
      try:
          result = 0
          class_number = len(classes)
          for i in classes:
              result += ((table[i][i]) / (max(TOP[i], P[i])))
          return result / class_number
      except Exception:
          return "None"
docs: Calculate CBA (Class balance accuracy).
  
      :param classes: classes
      :type classes : list
      :param table: input matrix
      :type table : dict
      :param TOP: test outcome positive
      :type TOP : dict
      :param P: condition positive
      :type P : dict
      :return: CBA as float