code: def overall_random_accuracy_calc(item):
      """
      Calculate Overall random accuracy.
  
      :param item: random accuracy or random accuracy unbiased
      :type item: dict
      :return: overall random accuracy as float
      """
      try:
          return sum(item.values())
      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 42 for calling a global function with example usage: overall_random_accuracy_calc(item) and returns: sum, str