Henrique Becker
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Latest activity by Henrique Becker
Henrique Becker created a post,
Bug? Model gives infeasible when three parameters are passed, but feasible if any is removed.
AnsweredThe problem is also described here (https://github.com/henriquebecker91/GeneratorG2OPP) and the specific MPS is in the same repository (https://raw.githubusercontent.com/henriquebecker91/GeneratorG...

Henrique Becker created a post,
Parameter for defining a memory limit (as a stopping criteria, like a time limit)
AnsweredI just want to confirm if it really does not exist a memory limit parameter like CPLEX (tree memory limit) that makes the optimizer stop with special status when reached (akin defining a time limit...

Henrique Becker commented,
I have about the same question and problem. If you are an academic user of the solver it can be of your interest to have a table in your paper with the time spent in the root node relaxation. The w...

Henrique Becker created a post,
Which is the index of variables added after variable deletion?
AnsweredConsider I have added three variables and update/solved the model, then I deleted one of them, and added one more variable. Now I want to change an attribute of the last variable added, which is th...

Henrique Becker commented,
Thank you for the detailed explanation. I will try the user cuts with care, then, if something goes wrong I will use lazy cuts or try to understand if I can work around it (by disabling a specific ...

Henrique Becker commented,
Thank you very much for your answer, it was the last resort solution I was converging to (after studying the docs yesterday) it is good to get confirmation it is the only way possible before doing ...

Henrique Becker created a post,
Solve the relaxation of the MIP and then solve the MIP without resolving the root node relaxation
AnsweredI have a large MIP model with a very strong LP relaxation. The main strategy for solving such problem in the literature is to solve the LP relaxation (what takes a long time) and then use the LP ob...

Henrique Becker commented,
Thanks for the fast answer. I do not know if there exists a valid solution on the specific value unit of the objective function and, as this method is a dual method (starts at an upper bound of a m...

Henrique Becker created a post,
Rejecting MIP Solutions without lazy cuts
AnsweredHi, I am working in a framework similar to benders decomposition. I use lazy cuts and callbacks for cutting new integer solutions that are not feasible considering a subproblem. Such lazy cuts just...