code: def render(self, mode="human"):
      if mode == "rgb_array":
          return np.zeros((4, 4, 3))
  
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 5 for calling the CustomGymEnv obj's underlying member method code with example usage: obj.render(mode) and returns: np