Magnus Lie Hetland

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Latest activity by Magnus Lie Hetland
  • Magnus Lie Hetland commented,

    Thanks!

  • Magnus Lie Hetland commented,

    Also: Would this affect the optimality of the returned result? I.e., do I need to set NumericFocus or Presolve for Gurobi to give me the right answer, here?

  • Magnus Lie Hetland commented,

    Thank you. I can confirm that the gap of 16% was also reported through the API; in the case of JuMP, when using MOI.get(model, MOI.RelativeGap()), though this should access the Gurobi library direc...

  • Magnus Lie Hetland commented,

    While I'd like to know what's going on, my primary concern is whether the result is, indeed, optimal; I assume there is no reason to suspect otherwise, given that Gurobi explicitly says so?

  • Magnus Lie Hetland commented,

    I have not added any callbacks on purpose, at least; I'm accessing Gurob i through JuMP.jl, and I guess some callbacks may have been set up there. The solver use is part of code that runs many mode...

  • Magnus Lie Hetland commented,

    Yes, I set the TimeLimit parameter, but it is set to 300, and this MIP finishes in 0.02 seconds. (I also set NodefileStart to 1.0.) Here is the entire log: Gurobi 9.1.1 (mac64) logging started Wed ...

  • Magnus Lie Hetland created a post,

    Nonzero gap for optimal solution?

    Answered

    Hi! For many instances, I get results that Gurobi (9.1.1) says are optimal, but which still have a large gap. For example: Optimal solution found (tolerance 1.00e-04)Best objective 1.250000000000e+...