Tuning error: Unable to improve on baseline parameter set

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  • Matthias Miltenberger

    Hi!

    This seems to be a pretty difficult problem. The tuning tool works best if the baseline runs already find a solution - in your case, all runs were unsuccessful and so there are no hints on how to improve the performance. As a rule of thumb, you should try testing around 100 parameter sets to see some significant improvements coming from the tuner - 10 is definitely not enough.

    I suggest dialing up heuristics and also try the NoRelHeurWork or NoRelHeurTime parameters. Another useful parameter might be MIPFocus=1 to try to find a feasible solution at all.

    It might also be that this instance is just extremely hard and you need to spend significantly more time to solve it.

    Cheers,
    Matthias

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