code: def step(self, action):
      obs, reward, done, info = self.env.step(action)
      return self.observation(obs), reward, done, info
  
imports: import time
  import numpy
  from collections import deque
  import gym
  from gym import spaces
  from parl.env.compat_wrappers import CompatWrapper, is_gym_version_ge, V_NPRANDOM_CHANGED
  import cv2
label_desc: Use image node_id 3 for calling the WarpFrame obj's underlying member method code with example usage: obj.step(action) and returns: self,  reward,  done,  info