Mike Lang
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Activity overview
Latest activity by Mike Lang-
Mike Lang commented,
Hi Jaromił, thank you for the answer. Can I send the example to you somehow? Even the reduced version is a bit large to post it here. Thank you! Mike
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Mike Lang created a post,
Overhead of adding lazy constraints via callback in Python
AnsweredDear all, I am adding cuts to a MILP via lazy constraints with model.cbLazy() in a callback routine at where == GRB.Callback.MIPSOL I am looking at the time it takes to add the lazy constraints ...
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Mike Lang commented,
Hi Jaromil, ok, thank you for the swift reply. Best regards Mike
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Mike Lang commented,
Hi Jaromil, apologies for the late reply, the workarounds did not work in my case. Therefore it would be great if the abvove-mentioned issue with using lazy constraints and MIP starts would be fixe...
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Mike Lang commented,
Dear all, was the above-mentioned issue with MIPs starts and lazy constraints solved in Gurobi 9.5? Best regards Mike
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Mike Lang commented,
Hi Jaromil, thanks a lot for the clarification. The number of lazy constraints, unfortunately, exceeds the number of my normal constraints significantly. Following your suggestion, I would like t...
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Mike Lang commented,
Hi Jaromil, thank you for the clarification on the MIPNODE callback. I was under the impression that it should be called earlier, I also understood that in the recent webinar on heuristics (callba...
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Mike Lang commented,
Dear all, was this issue resolved? I have found the same or a very similar problem that I cannot solve: https://support.gurobi.com/hc/en-us/community/posts/4408074414353-Callback-on-MIPNODE-is-lat...
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Mike Lang created a post,
Callback on MIPNODE is late or slow
AnsweredDear community, I am working on solving a large MIP with user callbacks. In one of the callbacks, I query if where == GRB.Callback.MIPNODE: and then add heuristic solutions via model.cbSetSolution...
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Mike Lang commented,
Hi Jaromil, In the meantime I fixed the issue, I believe it was somehow related to my callback procedure. Thank you for your assistance!