Sebastian Erik Løken Rindvoll

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Sebastian Erik Løken Rindvollさんの最近のアクティビティ
  • Sebastian Erik Løken Rindvollさんが投稿を作成しました:

    How Gurobi's concurrent MIP solver works

    回答済み

    Hi!  I am using your concurrent MIP solver in PyCharm to solve my fleet size and mix problem for the installation process of floating offshore wind. When I increase the number of turbines to be ins...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    Tobias Achterberg But can you tell anything from the log provided below? Can I see already from the presolve process that I have chosen the wrong upper or lower bounds?   /Users/sebastianeriklokenr...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    Thank you very much Tobias Achterberg. But how do I provide a MIP start in PULP in PyCharm. Right now I am using this:   prob.solve(GUROBI(MIPGap=0.01, Presolve=2, Cuts=2, Symmetry=2))

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    I have not completely understood if I can provide the model with a solution from the start to make sure that the lower bound does not start as low as 8448. Or is it possible to make the model solve...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    With different seeds, I have noticed that the solution appears at different times. The memory on the windows computer have never been an issue, but the CPU varies from 6% to 70% during the whole se...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    I have tried with different seeds, and it seems like that is the case, but I agree with you that it should not be like that. I have seen that I only use about 20% of the CPU on the windows computer...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    The Windows computer has more computational power than the mac, but the Mac seems to find solutions and explore nodes much faster than the Windows computer.

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    This is my Windows Log file:   C:\Users\serindvo\PycharmProjects\untitled\venv\Scripts\python.exe W:/PycharmProjects/untitled/venv/GurobiModel.pyUsing license file C:\Users\serindvo\gurobi.licAcade...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    Thank you! :)  But it is difficult to test for my model since when I increase one of the parameters in my model from 3 to 4 it goes from 30 seconds to over 20 000 seconds. And if I have understood ...

  • Sebastian Erik Løken Rindvollさんがコメントを作成しました:

    And how can it be that the windows computer searches through nodes faster than the mac computer the first thousand seconds? After a thousand seconds the Mac computer searches through nodes much fas...