code: def step(self, action):
      obs, reward, done, info = self.env.step(action)
      return obs, reward, done
  
file_path: PARL/benchmark/fluid/GA3C/actor.py
imports: import gym
  import numpy
  import parl
  from parl.env.atari_wrappers import wrap_deepmind, MonitorEnv, get_wrapper_by_cls
  from collections import defaultdict
label_desc: Use image node_id 2 for calling the Actor obj's underlying member method code with example usage: obj.step(action) and returns: obs,  reward,  done