
Mario Ruthmair
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Gurobi Staff
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Activity overview
Latest activity by Mario Ruthmair-
Mario Ruthmair commented,
See this article: What is the difference between user cuts and lazy constraints? Is there a specific reason why you are asking if there is another way to add lazy constraints? Are you missing somet...
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Mario Ruthmair commented,
Hi Florian, Yes, since many CVRP cut families cut off integer solutions, too, I would strongly recommend adding all your cuts with addLazy(). There is no downside to this; in fact, you might even b...
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Mario Ruthmair commented,
Hi Florian, You mentioned that you add the RCCs in the MIPNODE callback with addCut(). What happens if you add them in MIPNODE with addLazy()? Can you still reproduce the issue?This was my workarou...
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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 ...