Lorenzo Moreschini
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Activity overview
Latest activity by Lorenzo Moreschini-
Lorenzo Moreschini commented,
Thank you, I will try to experiment with those parameters.
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Lorenzo Moreschini created a post,
Iteratively apply user cuts before leaving root node
AnsweredI need to solve a MILP model that is essentially a Travelling Salesman Problem with additional constraints.As the core model is a TSP, most of the complexity is related to tightening the initial re...
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Lorenzo Moreschini commented,
In that way I still have to compute the obj function value, is there any shortcut? (a workaround could be to assign the obj function to a single variable and then read its relaxed value...)
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Lorenzo Moreschini created a post,
Get relaxed solution value in callback MIPNODE
AnsweredHow do I retrieve the value of the relaxed solution using the Java API when my callback is called in a MIPNODE and CB_MIPNODE_STATUS is OPTIMAL? In the documentation page I see: MIPNODE_OBJBST MI...
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Lorenzo Moreschini commented,
Found the issue: it seems that Gurobi does not always emit a message in Case B, even if the solution I load is not feasible. I found a bug in the heuristic procedure I use and now Gurobi immediatly...
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Lorenzo Moreschini commented,
Thank you Jaromił, I still have to try changing the settings you suggested, but there is something not clear to me: suppose that I am setting a MIPStart value for each variable in my the model (I s...
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Lorenzo Moreschini created a post,
User MIP start in Gurobi logs
AnsweredWhen I set an initial solution before solving a Gurobi model, I see one of the following three different kind of output inside Gurobi logs. Case A Warning: Completing partial solution with 30107 un...
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Lorenzo Moreschini created a post,
Lazy constraints and cuts in the same model callback
AnsweredLet M be the integer programming model I need to implement using Gurobi and let C be a family of cuts I am willing to add dynamically during the resolution.Also, the model M contains an exponential...
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Lorenzo Moreschini commented,
Hi Jaromił,reading the release notes of version 11.0 it seems that this feature has been added, right? Change the Threads parameter when resuming optimization If an optimization is interrupted (e....
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Lorenzo Moreschini commented,
Very helpful, thank you!