PuLP vs. GUROBI

[lamis...@ejust.edu.eg]

What is the difference between using the LP modeler PuLP  or  Gurobi in solving optimziation problems?
As far as I have tried, they generate different results for the same LP problem formulation.

Thanks

[Stuart Mitchell]

Pulp by default uses the cbc solver, if the objective value of the solutions the same. Often there can be multiple solutions with the same optimal objective, different solvers can find different solutions

Stu

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Stuart Mitchell

PhD Engineering Science

Extraordinary Freelance Programmer and Optimisation Guru

www.stuartmitchell.com

[Jakob Sch.]

Hi,

PuLP is a general purpose LP modeling tool in python (which can also use Gurobi as a solver). Gurobi has a python interface that also acts as modeling tool. It might be a bit harder to learn but it's more powerful (as it can also handle SOCP/QP constraints and has access to callback functions).
As Stuart already mentioned, the objective should be the same if you solve a model with either PuLP (and its default CBC solver) or Gurobi but the solutions might differ.

Best regards,
Jakob