Matlab engine starting error in Python (docker)

Question

J. 2023-2-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1914690-matlab-engine-starting-error-in-python-docker

评论： J. 2023-2-21

Hi,

I am using Matlab with Python in a docker (cloud) environment. The installation was okay. But starting matlab engine (2022b) in Python (3.8) returns the following error:

>>> import matlab.engine
>>> eng = matlab.engine.start_matlab()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/__init__.py", line 130, in start_matlab
    eng = future.result()
  File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/futureresult.py", line 67, in result
    return self.__future.result(timeout)
  File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/matlabfuture.py", line 87, in result
    handle = pythonengine.getMATLAB(self._future)
matlab.engine.EngineError: Connection to process with Exchange: " " was lost.

Using background = True didn't work as well:

>>> future = matlab.engine.start_matlab(background=True)
>>> eng = future.result()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/futureresult.py", line 67, in result
    return self.__future.result(timeout)
  File "/home/matlab/.local/lib/python3.8/site-packages/matlab/engine/matlabfuture.py", line 87, in result
    handle = pythonengine.getMATLAB(self._future)
matlab.engine.EngineError: Connection to process with Exchange: " " was lost.

Can anyone help me identify the issue here? Thanks in advance!

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Answer 1

Rajeev 2023-2-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1914690-matlab-engine-starting-error-in-python-docker#answer_1175450

The error message indicates that the connection to the MATLAB engine has been lost. This can happen for a number of reasons that include network issues, memory limitations, or other system constraints.

Here are some steps you can try to resolve this issue:

Increase the available memory for the Docker container. MATLAB can be memory-intensive, so if the container doesn't have enough memory allocated, it may cause the connection to be lost.
Check your network connection. Make sure the Docker container has access to the internet and that there are no network restrictions that may interfere with the MATLAB engine.
Try using a different version of MATLAB. Some versions of MATLAB may have compatibility issues with certain Python environments. You can refer to System Requirements for MATLAB Engine API for Python - MATLAB & Simulink (mathworks.com) and Versions of Python Compatible with MATLAB Products by Release - MATLAB & Simulink (mathworks.com)
Try starting the MATLAB engine with the -nojvm option. This will start the MATLAB engine without the Java Virtual Machine,that can help reduce memory usage and improve stability.
Try using a different Python version. Some users have reported issues with MATLAB engine in Python 3.8, so it may be worth trying a different version of Python, such as 3.7 or 3.9.