code: def var(self):
      return self._std**2
  
imports: import os
  from abc import ABC, abstractmethod
  import threading
  import pickle
  import redis
  import numpy
  from rl_coach.utils import get_latest_checkpoint
label_desc: Use image node_id 6 for calling the NumpySharedRunningStats obj's underlying member method code with example usage: obj.var() and returns: unknown