Mike Lang

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Recent activity by Mike Lang Recent activity Votes

  • Overhead of adding lazy constraints via callback in Python

    Answered

    Dear 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 ...

    Mike Lang 3 followers 4 comments 0 votes

  • Callback on MIPNODE is late or slow

    Answered

    Dear 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...

    Mike Lang Edited 3 followers 8 comments 1 vote

  • MIP start takes very long to process

    Answered

    Dear community,  I have a large MIP (solve with a Benders-Decomp / callbacks) for which I know several feasible solutions, the best of which I provide to the model as a MIP start. the MIP start inc...

    Mike Lang Edited 3 followers 7 comments 0 votes

  • Reducing MILP solution time

    Answered

    Dear community,  I am working with a MILP with a significant number of (binary) decision variables and where Gurobi takes very long to reduce the MipGap and struggles to get to an optimal solution....

    Mike Lang Edited 3 followers 5 comments 0 votes