Nicolas Zerega
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Activity overview
Latest activity by Nicolas Zerega-
Nicolas Zerega commented,
Got it, I will try that Thank you very much!
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Nicolas Zerega commented,
Hey Jaromil, If I understood correctly. For the last best bound found there may or may not be violated \(C\) conditions when solving \(SP\). If there aren't any then I'm "lucky" and the best lower ...
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Nicolas Zerega created a post,
How can I correctly retrieve/save the relaxed variables values associated with the best bound?
AnsweredHello everyone, Gurobi 10.0.0 (win64) logging started Mon Nov 21 12:27:41 2022Set parameter LogFile to value "IHLP.txt"Gurobi Optimizer version 10.0.0 build v10.0.0rc2 (win64)CPU model: AMD Ryzen 7...
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Nicolas Zerega commented,
Since, you compute your \(SP\) , could you use this information to add a cut yourself through a callback? Exactly, that's how I'm adding these cuts. First I get the relaxed var. values. With thos...
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Nicolas Zerega created a post,
Is there a way to tell gurobi to stay at root node until a certain condition is met?
AnsweredI'm working on a MIP problem (minimization). Currently, I have an exponentially large family of constraints \(C\), which I separate dynamically by solving an auxiliary problem \(SP\) (for separatio...
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Nicolas Zerega created a post,
Do lazy constraints cut fractional solutions?
AnsweredHere's a log of my model. I'm just working with the root node (node limit = 1) and have the heuristics parameter set to 0 as well as every gurobi cut (hence the lack of integer solutions) For the s...
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Nicolas Zerega commented,
I solved it by just setting the parameter NodeLimit to 1 But I still have the question as to why gurobi explores +2 nodes even when I tell it to stop when the NODCNT != 0
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Nicolas Zerega created a post,
Terminating optimization when leaving root node posts a different bestbound than the one in log.
Awaiting user inputPython 3 + Gurobi 9.5 I'm currently doing lower bound analysis in the root node. Since I'm only interested in the root I terminate the optimization using callbacks: if where == GRB.Callback.MIP and...
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Nicolas Zerega commented,
Hi Jaromil, Thanks you very much for answering. I will try to play around with dual and primal bounds and see what happens. So, if I understand correctly, I shouldn't consider the "node depth" numb...
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Nicolas Zerega created a post,
How does gurobi calculate the "Node Depth" number shown in logs?
AnsweredHi everyone, as the title says, I'm curious as how does gurobi get that number. Since, to the best of my knowledge (and this post https://support.gurobi.com/hc/en-us/community/posts/360047974992-Ge...