Impoving problem formulation

Answered

Domagoj Vatkovic

April 07, 2023 21:12

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Hi!

Is it possible to find out what presolver changed in my problem formulation?
Maybe my optimization problem could be formulated differently with less amount of variables and constraints. Could presolver help me with it?

Related to

• Presolve

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  Jaromił Najman

  • Gurobi Staff

  April 13, 2023 08:29

  Hi Domagoj,

  Is it possible to find out what presolver changed in my problem formulation?

  You can get the presolved model computed by Gurobi via the presolve method.

  Maybe my optimization problem could be formulated differently with less amount of variables and constraints. Could presolver help me with it?

  Reconstructing all presolve reductions "by hand" is most often not a trivial task, see How does presolve work? It is indeed often best to just let Gurobi do the work in presolve instead of doing it manually. So unless, presolve is taking a noticable amount of time compared to the rest of the solution process, it should not be necessary to perform specific presolve reductions on your own.

  Best regards, 
  Jaromił

   

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