class_docstr: A vectorized wrapper that normalizes the observations
  and returns from an environment.
code: def reset(self):
      self.ret = np.zeros(self.num_envs)
      obs = self.venv.reset()
      return self._obfilt(obs)
  
file_path: baselines/baselines/common/vec_env/vec_normalize.py
imports: from .None import VecEnvWrapper
  import numpy
label_desc: Use image node_id 4 for calling the VecNormalize obj's underlying member method code with example usage: obj.reset() and returns: self