code: def test_ddpg():
      args = [
          "--env-id",
          "Pendulum-v0",
          "--num-timesteps",
          300,
          "--noise-type",
          "ou_0.01",
      ]
      args = list(map(str, args))
      return_code = subprocess.call(
          ["python", "-m", "stable_baselines.ddpg.main"] + args
      )
      _assert_eq(return_code, 0)
  
file_path: stable-baselines/tests/test_continuous.py
imports: import subprocess
  import os
  import gym
  import pytest
  import numpy
  from stable_baselines import A2C, ACKTR, SAC, DDPG, PPO1, PPO2, TRPO, TD3
  from stable_baselines.common.vec_env import DummyVecEnv
  from stable_baselines.common.identity_env import IdentityEnvBox
  from stable_baselines.ddpg import AdaptiveParamNoiseSpec, NormalActionNoise
  from stable_baselines.common.evaluation import evaluate_policy
  from tests.test_common import _assert_eq
label_desc: Use image node_id 2 for calling a global function with example usage: test_ddpg() without return types