code: def _make_warmstart_cartpole():
      """Warm-start VecNormalize by stepping through CartPole"""
      venv = DummyVecEnv([lambda: gym.make("CartPole-v1")])
      venv = VecNormalize(venv)
      venv.reset()
      venv.get_original_obs()
  
      for _ in range(100):
          actions = [venv.action_space.sample()]
          venv.step(actions)
      return venv
  
file_path: stable-baselines/tests/test_vec_normalize.py
imports: import subprocess
  import gym
  import numpy
  import pytest
  from stable_baselines import DDPG, DQN, SAC, TD3
  from stable_baselines.common.running_mean_std import RunningMeanStd
  from stable_baselines.common.vec_env import DummyVecEnv, VecNormalize, VecFrameStack, sync_envs_normalization, unwrap_vec_normalize
  from .test_common import _assert_eq
label_desc: Use image node_id 6 for calling a global function with example usage: _make_warmstart_cartpole() and returns: venv