Is there a way to fix a parameter value when using the automatic tuning tool?

Answered

Jack Keefer

• September 19, 2023 03:01

Hello,

There is a parameter I know makes my model solve orders of magnitude faster (PreQLinearization = 0). With it, the model takes less than 0.1 seconds to solve, without it, it won't solve in the 200 second time limit I set. 

 

I would like to use the auto tune tool, however, I want Gurobi to always keep PreQLinearizaiton = 0 when it tests out other parameter values. Is there a way that I can accomplish this? 

 

Thank you for any help you can provide!

Related to

• Tuner

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• 

  Marika Karbstein

  Gurobi Staff

  • September 19, 2023 08:05

  You can fix parameters using the command line tuning tool via

  grbtune PreQLinearization=0 model.mps

  see Command-Line Tuning.

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• 

  Jack Keefer

  • September 19, 2023 17:11

  

  

  

  Hello,

   

  Thank you very much for your reply. I was able to successfully being tuning with the gurobi_cl interface, and was able to set a baseline parameter "NonConvex=2". However, when I use the command:

  grbtube PreQLinearization=0 NonConvex=2 model.mps

  it will begin tuning. However, it will only set "NonConvex=2" and will give me the message: 

  Set parameter NonConvex to value 2
  Unknown parameter: 'PreQLinearization' (ignored)

  
  Do you know why it would not recognize this parameter in the command line interface/what I could do differently? Thank you again!

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• 

  Simranjit Kaur

  Gurobi Staff

  • September 19, 2023 22:42
  • Edited

  Hi Jack,

  There is no Gurobi parameter called PreQLinearization. You probably want to set PreQLinearize=0.

  Best regards,
  Siman

   

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