Maliheh Aramon

Hi Anoop,  Gurobi keeps track of the current best bound while solving the root relaxation. Since the incumbent found by the heuristics was within approximately 2.5% of the current best bound before...

Does this mean that disabling the Gurobi heuristic should prevent this behavior? Setting the Heuristics parameter to 0 only means that Gurobi does not devote meaningful work to finding feasible s...

This is a bit strange, given that you have set the Threads parameter to 1. I have consulted our development team about this issue. A likely explanation could be that multiple heuristics applied to ...

Hi Eliass,  Aren't lazy cuts supposed to be added directly to the model? What could explain this behavior? Yes, the lazy cuts are added directly to the LP relaxation. However, the behaviour you o...

Hi Meijun,  Question 2. Why is it that directly running `.lp` files gives me lower objective function values than running the model? The models solved via the command line are different from the ...

Hi Chenhui,  What version of Gurobi are you using? Starting from Gurobi version 11.0.0, nonconvex models are solved to global optimality using outer approximation and spatial branch-and-bound when ...

Hi Hoko,  Yes, QP crossover is logged as a feature request in our repo. However, we cannot unfortunately commit to any timeline as of now.  Best regards, Maliheh  

Hi Yanxin,  I would like to know if I can determine the bounds from the logs as follows: No, you cannot do this.  Your model includes signs of numerical challenges including a quadratic matrix ra...

Hi, You might want to try the following parameters too: PreSparsify=2 ScaleFlag=2, Aggregate=0 and AggFill=0. Refer to the Presolve section in the numerical guidelines for more details on how ...

Hi Matteo, Do you get an explicit out-of-memory error code with error number 10001 for the 12-day model? The log only shows that the ordering took longer for the 12-day model.   What is the memory...