Mario Ruthmair

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...

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...

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...

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...

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...

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

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...

Here is a bug report: https://support.gurobi.com/hc/en-us/articles/27635574446353-Memory-leak-in-gurobipy-with-Python-3-12

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...

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 ...