AMPL GURUBI bestbound

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  • Eli Towle

    Hi Hector,

    Are you able to look at the full log produced by Gurobi? It seems that Gurobi does not improve the objective bound past \( 0 \) in the 60-second time limit. If you want to focus on improving the bound, a good place to start is to set the Cuts parameter to a more aggressive value and/or the MIPFocus parameter to 3. Of course, if the optimal objective value is \( 0 \), then the bound cannot be improved any further.

    Thanks,

    Eli

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  • Pritom Kumar Mondal

    Hello,

    I am having a similar problem. I am trying to find out the best bound of a simple test problem so that I can use it in my original problem. I am using the following commands on AMPL.

    model 2Modefile.mod;
    data 2dataset.dat;
    option gurobi_options 'bestbound=1';
    option solver gurobi;

    solve;

    The output is the following.

    Gurobi 9.1.1: bestbound=1
    Gurobi 9.1.1: optimal solution; objective 13150
    4 simplex iterations

    suffix bestbound OUT;

    My question is why it is showing "bestbound OUT"?

    Thanks,

    Pritom

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  • Robert Fourer

    I answered this question in another thread where you asked it today.

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