Python library compilation error (Python 3.9, MATLAB R2021b)
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Alberto Tellaeche
le 17 Mar 2022
Réponse apportée : Eric Delgado
le 19 Sep 2022
Hello all,
I am trying to use a Python library from within MATLAB for Reinforcement Learning. I have followed all the instructions and I have the library correclty installed in my system, using Python 3.9.11, which is supported by MATLAB 2021b. pyenv instruction also shows a correct detection of Python from MATLAB command line. I have also all the needed pip packages installed:
PS C:\Users\alberto.tellaeche> pip list
Package Version
------------------ --------
cffi 1.15.0
cloudpickle 2.0.0
Cython 0.29.28
fasteners 0.17.3
glfw 2.5.1
gym 0.23.1
gym-notices 0.0.6
gym-robotics 0.1.0
imageio 2.16.1
importlib-metadata 4.11.3
mujoco-py 2.1.2.14
numpy 1.22.3
Pillow 9.0.1
pip 22.0.4
pycparser 2.21
pygame 2.1.2
setuptools 58.1.0
zipp 3.7.0
One of the packages installed using "pip install", needs to compile something. I have checked C++ compiled and it is in the path MATLAB looks for it.
When I call the library from MATLAB´s command window:
env = py.gym.make('FetchReach-v1')
I get the following compiling error:
Compiling C:\Python39\lib\site-packages\mujoco_py\cymj.pyx because it changed.
[1/1] Cythonizing C:\Python39\lib\site-packages\mujoco_py\cymj.pyx
running build_ext
building 'mujoco_py.cymj' extension
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39\lib
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39\lib\site-packages
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39\lib\site-packages\mujoco_py
creating C:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39\lib\site-packages\mujoco_py\gl
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.23.28105\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -IC:\Python39\lib\site-packages\mujoco_py -IC:\Users\alberto.tellaeche\.mujoco\mujoco210\include -IC:\Python39\lib\site-packages\numpy\core\include -I.\include -I.\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.23.28105\ATLMFC\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.23.28105\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /TcC:\Python39\lib\site-packages\mujoco_py/gl/dummyshim.c /FoC:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39\lib\site-packages\mujoco_py/gl/dummyshim.obj -fopenmp -w
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.23.28105\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -IC:\Python39\lib\site-packages\mujoco_py -IC:\Users\alberto.tellaeche\.mujoco\mujoco210\include -IC:\Python39\lib\site-packages\numpy\core\include -I.\include -I.\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.23.28105\ATLMFC\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.23.28105\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /TcC:\Python39\lib\site-packages\mujoco_py\cymj.c /FoC:\Python39\lib\site-packages\mujoco_py\generated\_pyxbld_2.1.2.14_39_windowsextensionbuilder\temp.win-amd64-3.9\Release\Python39\lib\site-packages\mujoco_py\cymj.obj -fopenmp -w
Error using _msvccompiler>compile (line 403)
Python Error: CompileError: command 'C:\\Program Files (x86)\\Microsoft Visual
Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.23.28105\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
Error in build_ext>build_extension (line 529)
Error in build_ext>_build_extensions_serial (line 474)
Error in build_ext>build_extensions (line 449)
Error in old_build_ext>build_extensions (line 195)
Error in builder>build_extensions (line 149)
Error in build_ext>run (line 340)
Error in old_build_ext>run (line 186)
Error in dist>run_command (line 985)
Error in dist>run_commands (line 966)
Error in builder>_build_impl (line 249)
Error in builder>build (line 226)
Error in builder>load_cython_ext (line 110)
Error in builder><module> (line 504)
Error in __init__><module> (line 2)
Error in robot_env><module> (line 14)
Error in fetch_env><module> (line 3)
Error in __init__><module> (line 1)
Error in <frozen importlib>_call_with_frames_removed (line 228)
Error in <frozen importlib>exec_module (line 850)
Error in <frozen importlib>_load_unlocked (line 680)
Error in <frozen importlib>_find_and_load_unlocked (line 986)
Error in <frozen importlib>_find_and_load (line 1007)
Error in <frozen importlib>_gcd_import (line 1030)
Error in __init__>import_module (line 127)
Error in registration>load (line 55)
Error in registration>make (line 139)
Error in registration>make (line 520)
Error in registration>make (line 676)
>>
I have googled for this problem, and although it seems common, no thread gives a proper solution, and even less taking MATLAB into account.
Could anyone give a possible solution for this issue.
Thank you all very much in advance.
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Réponse acceptée
Eric Delgado
le 19 Sep 2022
Hi @Alberto Tellaeche, I was dealing with a similar issue - numpy was the lib that was not running. The solution was create a new env using conda.
Anaconda prompt (or similar):
conda create -n numpy python=3.9 numpy -c conda-forge -y
Matlab (pointer to the python.exe of the new env):
pyenv('Version', 'C:\Users\eric\anaconda3\envs\numpy\python.exe')
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