class_docstr: Frame stacking wrapper for vectorized environment
  
  :param venv: (VecEnv) the vectorized environment to wrap
  :param n_stack: (int) Number of frames to stack
docstr: Reset all environments
code: def reset(self):
      """
      Reset all environments
      """
      obs = self.venv.reset()
      self.stackedobs[...] = 0
      self.stackedobs[..., -obs.shape[-1] :] = obs
      return self.stackedobs
  
file_path: stable-baselines/stable_baselines/common/vec_env/vec_frame_stack.py
imports: import warnings
  import numpy
  from gym import spaces
  from stable_baselines.common.vec_env.base_vec_env import VecEnvWrapper
label_desc: Use image node_id 3 for calling the VecFrameStack obj's underlying member method code with example usage: obj.reset() and returns: self