class_docstr: Add observations rendering in 'rgb_array' mode.
class_docstr_tok: ["Add","observations","rendering","in","'rgb_array","'","mode","."]
code: def render(self, mode="human", **kwargs):
      assert mode == "rgb_array"
      return self.last_observation
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import os
  import re
  import gym
  import numpy
  import six
  from tensor2tensor.models.research.rl import get_policy
  from tensor2tensor.models.research.rl import make_simulated_env_fn_from_hparams
  from tensor2tensor.rl import rl_utils
  from tensor2tensor.rl.envs.simulated_batch_gym_env import FlatBatchEnv
  from tensor2tensor.utils import hparam
  from tensor2tensor.utils import trainer_lib
  from tensor2tensor.utils.misc_utils import camelcase_to_snakecase
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling the RenderObservations obj's underlying member method code with example usage: obj.render(mode) and returns: self