Error 5001 when I use python multiprocessing module, which calls Matlab functions

I used python multiprocessing module for multiprocessing a image processs function, in which I started a Matlab engine and call Matlab functions. Then it appeared many pop-ups: Error 5001 - Unable to access services required to run MATLAB.

I tried to start the Matlab engine in main function and passed the engine as parameters to the image function, but then it appeared TypeError: cannot pickle 'weakref.ReferenceType' object.

The rough code is as follows:

def ImageProcess(data):

eng = matlab.engine.start_matlab()

...

return results

if __name__ == '__main__':

pool = multiprocessing.Pool()

results = pool.map(ImageProcess, data)

pool.close()

pool.join()

Answer 1

[Esther]

This error indicates that the MATLAB has encountered a licensing issue. Try the solutions below to resolve the error:

https://ww2.mathworks.cn/matlabcentral/answers/1814080-why-do-i-receive-error-5001-unable-to-access-services-required-to-run-matlab?requestedDomain=zh