class_docstr: A simple environment with a 3x3 observation space, is done on action=1.
class_docstr_tok: ["A","simple","environment","with","a","3x3","observation","space",",","is","done","on","action=1","."]
code: def __init__(self):
      self.reward_range = (-1.0, 1.0)
      self.action_space = spaces.Discrete(2)
      self.observation_space = spaces.Box(low=0, high=255, shape=(3, 3))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import unittest
  import gym
  from gym import spaces
  import numpy
  from tensor2tensor.rl import gym_utils
  import tensorflow.compat.v1
label_desc: Use image node_id 1 to create a new SimpleEnv object from inherited base classes: gym with example: obj = SimpleEnv()