Question in gurobi

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Kewei Fan

2023年12月28日 12:16

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I am a beginner, my model has this problem, I visit IIS is like this, but I do not know what this represents, can you explain to me?

関連

• computeIIS

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  Elisabeth Rodríguez Heck

  • Gurobi Staff

  2023年12月28日 12:32

  Hi Kewei,

  It looks like you are calling Model.optimize() after computing the IIS, is this correct? This results in Status code 3 (infeasible) because the IIS is by definition an infeasible set of constraints. The IIS feature is meant to be used to write the IIS into a file using 

  model.write('iismodel.ilp')

  after computing it, and then inspecting the ILP file manually to understand why your model is infeasible. 

  You may find the article How do I use 'compute IIS' to find a subset of constraints that are causing model infeasibility? helpful. 

  Best regards,

  Elisabeth

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  Kewei Fan

  2023年12月29日 05:20

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  Thank you very much for your answer

   

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