Tuner settings for best primal solution

Answered

Matthew Galati

• March 30, 2024 19:21

How do I guide the tuner to look for the best possible primal solution given some time limit (as opposed to the best mip gap)? 

For example, I believe this is attempting to find the best settings to minimize the mip gap in 10 minutes. 
grbtune TimeLimit=600 TuneTimeLimit=43200 xxx.mps

Does the following change the focus of the tuning? Or does it just change the baseline of comparison?
grbtune TimeLimit=600 MIPFocus=1 TuneTimeLimit=43200 xxx.mps

Related to

• Tuner

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• 

  Riley Clement

  Gurobi Staff

  • March 30, 2024 21:40

  Hi Matt,

  TuneCriterion=2 is what you after.

  The default value of this parameter doesn't necessarily attempt to minimize MIP gap.  The tuner will run a few experiments then choose a criterion based on the results.

  Including a parameter like MIPFocus=1 instructs the tuner that this parameter value is mandatory.  It doesn't directly change the focus of tuning, but if you do not set TuneCriterion then it may indirectly change the focus since it could influence the results of those initial experiments which the tuner uses to automatically decide a value for TuneCriterion.

  - Riley

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  Matthew Galati

  • March 30, 2024 23:52

  

  

  

  Got it. Thanks Riley!

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