Pyglet 1.4.x breaks visualization code used in RL chapter

[thephet]

I had to downgrade pyglet to 1.3.2 for it to work.

[ageron]

Interesting, thanks for your feedback @thephet. Could you please give more details on your OS, whether you were using Jupyter or not, and what exception or visualization issue you got? Thanks!

[thephet]

OS is ArchLinux. Python is 3.7. I am using jupyter. The code that crashes is:

img = env.render(mode="rgb_array")
img.shape

The error is:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-9-858f7f1e8578> in <module>
----> 1 img = env.render(mode="rgb_array")
      2 img.shape

/usr/lib/python3.8/site-packages/gym/core.py in render(self, mode, **kwargs)
    233 
    234     def render(self, mode='human', **kwargs):
--> 235         return self.env.render(mode, **kwargs)
    236 
    237     def close(self):

/usr/lib/python3.8/site-packages/gym/envs/classic_control/cartpole.py in render(self, mode)
    186         self.poletrans.set_rotation(-x[2])
    187 
--> 188         return self.viewer.render(return_rgb_array = mode=='rgb_array')
    189 
    190     def close(self):

/usr/lib/python3.8/site-packages/gym/envs/classic_control/rendering.py in render(self, return_rgb_array)
    103             buffer = pyglet.image.get_buffer_manager().get_color_buffer()
    104             image_data = buffer.get_image_data()
--> 105             arr = np.frombuffer(image_data.data, dtype=np.uint8)
    106             # In https://github.com/openai/gym-http-api/issues/2, we
    107             # discovered that someone using Xmonad on Arch was having

When I downgrade to 1.3.2 it works

You can read more about this here: https://github.com/tensorflow/agents/issues/163

[einarf]

I guess it should use get_data instead to support both 1.3 and 1.4. Pyglet 1.4 are just hiding some attributes. There is a lot of compatibility issues in 1.3.x that is fixed in 1.4.x. 1.4.9 just released today.