PulpSolverError: Error while executing cbc.exe

[Aleksandra Firkowska]

Hello,

I am quite new to programming and I have been trying to use PULP for an inventory stock optimisation. I have however hit a wall.

The model is working and I am getting an optimal solution for a relatively small dataset, however when I try to run this model for a larger dataset I it not working and I am getting an error in actualSolve:

return self.solve_CBC(lp, **kwargs)

getting an error while executing the cbc.exe

I have tried and I can actually run it manually once I go into the folder.

I have also tried using model.solve(pulp.GLPK()) but this is coming up with similar error but when executing glpsol.exe

I really do not know what to do anymore as I do not have much programming/computing background and I do not understand how it works for smaller dataset but not a larger one.

Is someone able to help?

Thank you in advance!

[Stuart Mitchell]

Have you looked at the amount of memory used by your computer while solving?

Stu

Stuart Mitchell

PhD Engineering Science

Extraordinary Freelance Programmer and Optimisation Guru

www.stuartmitchell.com

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[Aleksandra Firkowska]

Hi Stu, 

the memory seems to not be a big problem I do not think, as the CPU goes up to about 5%, where as the memory it uses is at 20%, still have 4.4 GB available.

Thanks

On Monday, July 9, 2018 at 12:27:05 AM UTC+1, Stuart Mitchell wrote:

Have you looked at the amount of memory used by your computer while solving?

Stu

Stuart Mitchell

PhD Engineering Science

Extraordinary Freelance Programmer and Optimisation Guru

www.stuartmitchell.com

On Sat, Jul 7, 2018 at 1:50 AM, Aleksandra Firkowska <ola.fi...@gmail.com> wrote:

Hello,

I am quite new to programming and I have been trying to use PULP for an inventory stock optimisation. I have however hit a wall.

The model is working and I am getting an optimal solution for a relatively small dataset, however when I try to run this model for a larger dataset I it not working and I am getting an error in actualSolve:

return self.solve_CBC(lp, **kwargs)

getting an error while executing the cbc.exe

I have tried and I can actually run it manually once I go into the folder.

I have also tried using model.solve(pulp.GLPK()) but this is coming up with similar error but when executing glpsol.exe

I really do not know what to do anymore as I do not have much programming/computing background and I do not understand how it works for smaller dataset but not a larger one.

Is someone able to help?

Thank you in advance!

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[Aleksandra Firkowska]

after checking everything, I have realised one small issue that seemed to be causing the error- NaN values in datasets! Thank you for all the help

[Miguel Quintero]

Hi everyone, 

Aleksandra in overview means that the cbc. exe is not executing due to NaN values while it is runing right ?. Actuaaly I'm presenting the same issue right now 'pulp.solvers.PulpSolverError: Pulp: Error while trying to execute: ..... : \site-packages\pulp\solverdir\cbc\win\64\cbc.exe'