Retrieve Pool Solutions in Callback

Answered

Jan-Erik Hein

June 20, 2022 12:57

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Hi everyone,

is it possible to retrieve solutions from the solution pool during a callback? Or can pool solutions only be retrieved after the solving process finished?

Best,

Jan

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:34

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  Marika Karbstein

  • Gurobi Staff

  June 20, 2022 14:26

  Hi Jan,

  It is not possible to retrieve the sub-optimal pool solutions during a callback since it is not possible to change parameters in a callback. You can only access the values for the current best solution.
  You could save objective and/or variable solution values during a MIP callback whenever a new solution is found to use this information later on.

  I hope this helps,
  Marika

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