Setting params in the Callback

Answered

Kirk Pinneo

November 27, 2019 20:03

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Up until version 9.0, I was able to set params in the callback.

model.set(GRB.DoubleParam.Cutoff, value)

I am no longer able to do this?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 03:20 Edited

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
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  Silke Horn

  • Gurobi Staff

  November 28, 2019 12:11

  Changing parameters from within a callback has never been supported and could lead to undefined behavior with previous versions. To avoid this, Gurobi now returns an error.

  Instead of setting a new Cutoff in a callback, you should terminate the optimization from your callback, change the parameter and resume.

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