Error using HiGHS solver in Python-MIP

[jerak]

Description
Hello, first of all I am not sure if this is an issue related to Highspy, so please let me know if that is indeed not the case.

I am trying to use the HiGHS-solver as an alternative to the CBC-solver that I previously used. I am using the Python-MIP wrapper (see: Python-MIP.

I am using a Windows machine, using Python 3.9.

To achieve this, I have done the following:

• Installed the latest Python-MIP version on master, i.e., the version that contains this fix: #377
• Installed highspy 1.9.0
• Installed cffi 1.17.0

AttributeError: function/symbol 'Highs_destroy' not found in library 
'~\venv\lib\site-packages\highspy\_core.cp39-win_amd64.pyd': error 0x7f

Operating System Information

• Operating System, version: Windows 11
• Python version: 3.9
• Python-MIP version (we recommend you to test with the latest version): latest master-version

Question
Did anyone using the HiGHS-solver already encounter this error before? Does anyone have suggestions on the steps to take?

Update
I also tried using different a different version of highspy: 1.7.1.dev1, but no luck.

[galabovaa]

@jerak, Thank you for getting in touch. Python-MIP is a separate package not supported by us and in the past months we have made some major updates. My initial guess would be that the Python-MIP highs wrapper may need to be modified to incorporate our latest changes.

Could you please try highspy 1.7.2 and let us know if that gives you an error?

[jerak]

Hi @galabovaa, thank you for your quick reply.

I installed highspy 1.7.2, but I unfortunately get the same error

[galabovaa]

OK, thank you for checking! I think for this one it is worth opening an issue in the Python-MIP repo, if you haven't already.

[jajhall]

I hope you get some response from Python-mip, but bear in mind what's said here