docstr: No stacking. Trajectory View API takes care of this.
code: def __init__(self, env):
      """No stacking. Trajectory View API takes care of this."""
      gym.Wrapper.__init__(self, env)
      shp = env.observation_space.shape
      assert shp[2] == 1
      self.observation_space = spaces.Box(
          low=0,
          high=255,
          shape=(shp[0], shp[1]),
          dtype=env.observation_space.dtype,
      )
  
imports: from collections import deque
  import gymnasium
  from gymnasium import spaces
  import numpy
  from typing import Union
  from ray.rllib.utils.annotations import PublicAPI
  from ray.rllib.utils.images import rgb2gray, resize
label_desc: Use image node_id 1 to create a new FrameStackTrajectoryView object from inherited base classes: gym with example: obj = FrameStackTrajectoryView(env)