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Warm start approach gives suboptimal solution

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1 comment

  • Mario Ruthmair
    Gurobi Staff Gurobi Staff

    Hi Eunseok Kim,

    As you are already using NumericFocus=3 you seem to be aware that your model might suffer from numerical issues. Actually the coefficient ranges are quite large and you should think about scaling to reduce them, see our numerical guidelines. You are using general constraints that are potentially approximated via PWL functions which could also lead to numerical issues.

    If you provide a MIP start the solution path of the solver changes and if numerical issues are present actually many (sometimes strange) things can happen. 

    I can see that the MIP start solution has rather good quality with respect to violations.
    What about the better solutions found in the run without MIP start? How does their quality look like?

    Best regards,


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