PoolObjVal issues

回答済み

Vladimir Gusev

• 2019年05月09日 17:00

PoolObjVal returns 0 for all solutions in the pool. I am quite puzzled, since var.Xn behaves as expected. Further, example poolsearch.py works as expected as well on my machine. I am optimising quadratic function over binary variables with linear constraints. Does anyone have an idea what could be the reason?

1

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  Daniel Espinoza

  • 2019年05月10日 13:30

  Hi Vladimir,

   

  Can you please share your model? I Think I know where the issue is coming from.

   

  Best,

  Daniel

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  Vladimir Gusev

  • 2019年05月10日 14:26

  

  

  

  Hi Daniel,

   

  here you are: https://www.dropbox.com/s/mdp8r4dxnc0yph5/p.mps?dl=0 

   

  Best wishes,

  Vladimir

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  Daniel Espinoza

  • 2019年05月10日 14:34

  Hi Vladimir,

   

  I am sorry to say that we did find an issue with PoolObjVal and quadratic or piece-wise linear objectives, the issue has been fixed in the code and the fix will be part of any upcoming release (either technical or mayor), unfortunately we don't have a time frame for that.

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  NP

  • 2020年12月08日 22:48

  

  

  Hello,

  Quite a puzzling issue indeed. I guess this fix has not made it to a release yet. I came across the same problem in a model with a quadratic objective. I'm using Gurobi 9.1.0 through the Pyomo persistent solver interface. 

  Thanks, 
  Nikos

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  Eli Towle

  Gurobi Staff

  • 2020年12月09日 04:30

  This issue was fixed last year with the release of Gurobi 9.0.0. Can you verify in the Gurobi log/output that Pyomo is using version 9.1.0 of Gurobi and not an older version?

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  NP

  • 2020年12月09日 12:40

  

  

  That was the problem indeed. Thanks a lot. 

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