code: def func_b(self):
      return self.var_b
  
imports: import collections
  import functools
  import itertools
  import multiprocessing
  import pytest
  import gym
  import numpy
  from stable_baselines.common.vec_env import DummyVecEnv, SubprocVecEnv, VecNormalize, VecFrameStack
label_desc: Use image node_id 2 for calling the CustomWrapperB obj's underlying member method code with example usage: obj.func_b() and returns: self