Gym: 'ALEInterface' object has no attribute 'getScreenRGB2'

[mathDR]

Hello, just installed gym with atari support and ran the most basic example I could think of:

import gym
env = gym.make("Pong-v0")
observation = env.reset()
for _ in range(1000):
  env.render()
  action = env.action_space.sample() # your agent here (this takes random actions)
  observation, reward, done, info = env.step(action)

and this threw the Error:

AttributeError: 'ALEInterface' object has no attribute 'getScreenRGB2'

I physically changed line 86 in gym/gym/envs/atari/atari_env.py from

return self.ale.getScreenRGB2()

to

return self.ale.getScreenRGB()

but that throws a segmentation fault.

I am running osx 10.11.6

Any ideas?

[tlbtlbtlb]

You have an older version of atari-py. pip install --upgrade atari-py.

[mathDR]

Updated atari-py-0.0.18 to atari-py-0.0.21 and the issue is resolved. I wonder why the setup.py didn't flag the mismatch?

[mathDR]

Just to be complete: I git cloned the repo and used

pip install -e .

to install.

[tlbtlbtlb]

Atari is an optional dependency of gym -- it's only installed with pip install -e .[atari].

[cws7777]

How about on windows 10? I'm using Windows 10 with anaconda. I tried most of things to upgrade atari-py but didn't work. any suggestions for anaconda prompt?? Having same error as question on the top page.

[tlbtlbtlb]

@cws777 You have an obsolete version of atari-py.

$ pip install --upgrade atari-py.

to fix.