Mario Ruthmair
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Activity overview
Latest activity by Mario Ruthmair-
Mario Ruthmair commented,
Hi Giovanni, Gurobi provides a general-purpose solver, while Hexaly provides specific interfaces to particular problem types, e.g., routing problems, which allows the use of problem-specific soluti...
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Mario Ruthmair commented,
Hi Krypt, Sometimes, people add binary arc variables x(a,b) that are actually not needed in a route formulation. But you can do some stuff with them, e.g., branching, additional cuts, etc.Of course...
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Mario Ruthmair commented,
Hi David, Yes, indeed, the WLS academic license requires a permanent internet connection since it requests a license token from our servers every 5 minutes. Best regards,Mario
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Mario Ruthmair commented,
Hi David, Your named-user license, unfortunately, does not work with a token server.For a WSL2 setup, we recommend the so-called "WLS Academic" license (WLS = Web License Service). You can generate...
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Mario Ruthmair commented,
Here is a bug report: https://support.gurobi.com/hc/en-us/articles/27635574446353-Memory-leak-in-gurobipy-with-Python-3-12
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Mario Ruthmair commented,
Our developers narrowed it down to a memory leak related to the Cython version used to build gurobipy 11.0.x. We are using a newer Cython version for the coming 12.0.0 release, so the issue will be...
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Mario Ruthmair commented,
Hi Shahrzad, If all variables p(s) on the right-hand side exist from the beginning and are not created via column generation (and only \rho(s,a) are generated), I guess you can define the complete ...
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Mario Ruthmair commented,
Hi Shahin, The constraint indices are created and maintained by Pyomo, not by Gurobi.From the Gurobi side, you need to ensure that the optimization result is "optimal" to obtain the dual values. Mario
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Mario Ruthmair commented,
Hi Rainne, This model seems to be tough. However, I also oversaw an important point: MIPFocus=3 is a meta-parameter and will automatically set Presolve=2. If you want to keep MIPFocus=3 (you should...
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Mario Ruthmair commented,
Hi Rainne, With parameters Set parameter PreSparsify to value 2 Set parameter Presolve to value 2 you enabled aggressive presolving, which takes too much time for your model.What happens if you kee...