Riley Clement

Hi Haiyi,Please see the following article: https://support.gurobi.com/hc/en-us/articles/33982552193937-As-a-student-at-a-university-in-China-how-do-I-request-a-Free-Academic-LicenseBest of luck wit...

Hi 玉鑫 张 ,This can be normal, it all depends on the model.Firstly though, I think you are setting way too many parameters.  When we make parameter recommendations for customers, based on their model...

Hi Haonan,When Gurobi finds a solution it will call your callback method using a “MIPSOL” argument for the where parameter, which gives you a chance to cut the solution off with a lazy constraint. ...

Hi Greg,I created a ticket to keep you updated.- Riley

Hi Greg!I'll ping the dev team.- Riley

Hi Haonan,Yes, feasible solutions can be found during presolve as we have some simple heuristics which run in parallel threads during presolve.- Riley

Hi Paula,The log shows 33 variables added to disaggregate expressions. Is Gurobi decomposing the degree-4 product into a chain of bilinear constraints during presolve, e.g.:   t1 = w_i · (Cbar_i - ...

Hi Federica,The Lazy attribute is only relevant to constraints that you generate before the solve, so if you're using a callback to add lazy constraints, then you don't have to worry about this att...

Hi Than,Modern MIP solvers are very complex beasts and it is not easy to infer what is happening from logs alone.  I'm not sure what you mean by “faulty branch”.  Perhaps you are referring to a nod...

Hi Aurélien,The basis provided is extremely ill-conditioned.  We can calculate the Kappa value like so:import gurobipy as gp m = gp.read("test.lp") m.read("test.bas") m.params.IterationLimit=0 m.op...