Mike Lang

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

Hi Jaromil,  ok, thank you for the swift reply.  Best regards Mike

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...

Dear all,  was the above-mentioned issue with MIPs starts and lazy constraints solved in Gurobi 9.5? Best regards Mike

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...

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...

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...

Hi Jaromil,  In the meantime I fixed the issue, I believe it was somehow related to my callback procedure.  Thank you for your assistance!

As a follow-up question: When I start from a .sol file I still get the message that the MIP start did not produce a new incumbent solution. This also happens if I generate the .sol file from the sa...

Hi Jaromil,  thanks a lot for the answer! It did improve the performance. However, I opted now to simply retreive solution from .sol files that I generate with an easy to solve version of the model...