code: def main():
      """
      Runs the test
      """
      parser = atari_arg_parser()
      parser.add_argument(
          "--policy",
          help="Policy architecture",
          choices=["cnn", "lstm", "lnlstm", "mlp"],
          default="cnn",
      )
      args = parser.parse_args()
      logger.configure()
      train(
          args.env,
          num_timesteps=args.num_timesteps,
          seed=args.seed,
          policy=args.policy,
      )
  
imports: from stable_baselines import PPO2, logger
  from stable_baselines.common.cmd_util import make_atari_env, atari_arg_parser
  from stable_baselines.common.vec_env import VecFrameStack
  from stable_baselines.common.policies import CnnPolicy, CnnLstmPolicy, CnnLnLstmPolicy, MlpPolicy
label_desc: Use image node_id 2 for calling a global function with example usage: main() without return types