Where is render() referenced in the environment?

[doerlbh]

Thanks for sharing this repo! I wish to try changing the rendering of display, and noticed the render() function is not explictly implemented in both AtariEnvironment and ToyEnvironment. Do you mind letting me know where to find the rendering options? (e.g. where you referenced the atari_env.py of gym in your code? or you didn't?)

Thanks in advance!