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NSWindow main thread error when trying to setup Gymnasium (openapi gym) #257
Description
Hi, im trying to run some simple gymnasium stuff and getting the following error:
(require-python '[gymnasium :as gym])
(def env (gym/make "LunarLander-v2" :render_mode "human"))
; error (Temurin java 17) or crash (correto java 17)
(py. env reset :seed 42)
Execution error at libpython-clj2.python.ffi/check-error-throw (ffi.clj:707).
Traceback (most recent call last):
File "/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/gymnasium/wrappers/time_limit.py", line 75, in reset
return self.env.reset(**kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/gymnasium/wrappers/order_enforcing.py", line 61, in reset
return self.env.reset(**kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/gymnasium/wrappers/env_checker.py", line 57, in reset
return env_reset_passive_checker(self.env, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/gymnasium/utils/passive_env_checker.py", line 186, in env_reset_passive_checker
result = env.reset(**kwargs)
^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/gymnasium/envs/box2d/lunar_lander.py", line 461, in reset
self.render()
File "/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/gymnasium/envs/box2d/lunar_lander.py", line 699, in render
self.screen = pygame.display.set_mode((VIEWPORT_W, VIEWPORT_H))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pygame.error: NSWindow should only be instantiated on the main thread!I'm on OSX Sonoma (silicon), python 3.11.6, Clojure 1.11.1 and java 17. I was actually about to write this as a crash report, but decided to try another Java 17 jvm and was able to get the error output instead.
In any case, is there something one can do with libpython-clj to setup the call such that it's on the main thread?
Activity
eoliphan commentedon Oct 25, 2023
Ok so i missed this #10 (comment) when i was looking through the issues. So i just tried putting the code in a
-mainand ran it withclojure -mbut still seeing the error.But based on that comment is this something that even can be addressed on the clj-python side?
cnuernber commentedon Oct 25, 2023
Most likely you have to run in embedded mode. I am surprised clojure -m didn't solve the issue but especially with windowing systems there is a lot going on such as signal handling callbacks that the JVM does when it is the main process that potentially other systems do not work well with.
eoliphan commentedon Oct 25, 2023
Embedded mode is this? https://clj-python.github.io/libpython-clj/embedded.html
jjtolton commentedon Oct 26, 2023
I think there might be something else going on:
I was able to run this fine from repl w/o embedded.
Clojure 1.11.1, Java 17.0.9, Ubuntu 22. I'm not sure if the silicon has something to do with it or could be local install issues.
jjtolton commentedon Oct 26, 2023
@eoliphan did you try the equivalent code in Python? I tend to find that's a pretty good troubleshooting step for some of these issues.
Make sure this works out for you from the directory where you are running your code: