class_docstr: An environment with a pre-determined observation space
  and RNG seed.
class_docstr_tok: ["An","environment","with","a","pre-determined","observation","space","and","RNG","seed","."]
code: def render(self, mode=None):
      raise NotImplementedError
  
file_path: baselines/baselines/common/vec_env/test_vec_env.py
imports: import gym
  import numpy
  import pytest
  from .dummy_vec_env import DummyVecEnv
  from .shmem_vec_env import ShmemVecEnv
  from .subproc_vec_env import SubprocVecEnv
  from baselines.common.tests.test_with_mpi import with_mpi
label_desc: Use image node_id 4 for calling the SimpleEnv obj's underlying member method code with example usage: obj.render(mode) without return types