code: def reset(self):
      ob = self.env.reset()
      for _ in range(self.k):
          self.frames.append(ob)
      return self._get_ob()
  
imports: import numpy
  import os
  from collections import deque
  import gym
  from gym import spaces
  import cv2
  from .wrappers import TimeLimit
label_desc: Use image node_id 2 for calling the FrameStack obj's underlying member method code with example usage: obj.reset() and returns: self