"NameError: name 'base' is not defined" in DQN tutorial

[moskomule]

Thanks for pretty nice tutorial, but I have a problem when running the DQN tutorial.
I ran it on an Ubuntu server then got an error message bellow at the ** Input extraction ** section.

NameError                                 Traceback (most recent call last)
<ipython-input-7-ca07103bb7e3> in <module>()
     30 
     31 
---> 32 plt.imshow(get_screen().squeeze(0).permute(1, 2, 0).numpy(), interpolation='none')
     33 # plt.show()

<ipython-input-7-ca07103bb7e3> in get_screen()
     10 
     11 def get_screen():
---> 12     screen = env.render(mode='rgb_array').transpose((2, 0, 1)) # transpose into torch order (CHW)
     13     # Strip off the top and bottom of the screen
     14     screen = screen[:, 160:320]

/home/USER/anaconda3/lib/python3.5/site-packages/gym/core.py in render(self, mode, close)
    172             raise error.UnsupportedMode('Unsupported rendering mode: {}. (Supported modes for {}: {})'.format(mode, self, modes))
    173 
--> 174         return self._render(mode=mode, close=close)
    175 
    176     def close(self):

/home/USER/anaconda3/lib/python3.5/site-packages/gym/envs/classic_control/cartpole.py in _render(self, mode, close)
    111 
    112         if self.viewer is None:
--> 113             from gym.envs.classic_control import rendering
    114             self.viewer = rendering.Viewer(screen_width, screen_height)
    115             l,r,t,b = -cartwidth/2, cartwidth/2, cartheight/2, -cartheight/2

/home/USER/anaconda3/lib/python3.5/site-packages/gym/envs/classic_control/rendering.py in <module>()
     21 
     22 try:
---> 23     from pyglet.gl import *
     24 except ImportError as e:
     25     reraise(prefix="Error occured while running `from pyglet.gl import *`",suffix="HINT: make sure you have OpenGL install. On Ubuntu, you can run 'apt-get install python-opengl'. If you're running on a server, you may need a virtual frame buffer; something like this should work: 'xvfb-run -s \"-screen 0 1400x900x24\" python <your_script.py>'")

/home/USER/anaconda3/lib/python3.5/site-packages/pyglet/gl/__init__.py in <module>()
    222     else:
    223         from .carbon import CarbonConfig as Config
--> 224 del base
    225 
    226 # XXX remove

NameError: name 'base' is not defined

xvfb-run may work with python command but how to manage or fix this problem with Jupyter? Thank you.

[apaszke]

This looks more like a pyglet bug or a gym problem. You should probably report that to maintainers of these packages.

[moskomule]

ok, firstly I'll reinstall them. Thank you.