Different solutions for different launches of MIP

ユーザーの入力を待っています。

Domagoj Vatkovic

2023年09月18日 07:42

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Hi!

I receive different solutions for different launches of the same MIP. I understand that my problem has at least several solutions, but it's hard to analyze the results because of different solutions. Is there any approach or option to fix the unique solution?  

Thanks in advance

関連

• Deterministic

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  Silke Horn

  • Gurobi Staff

  2023年09月18日 07:57

  Hi Domagoj,

  There are a few things that can introduce non-determinism into your Gurobi runs:

  • Using non-deterministic data structures: When your model is created with input from external data sources, you could, for example, end up with a different order of variables and/or constraints. This can lead to a different solution path and, hence, different solutions. Compare the models' fingerprint to make sure you are actually solving the exact same model each time.
  • Running on different hardware or with different settings can also lead to a different solution path.
  • Some parameters, such as a TimeLimit, can introduce non-deterministic.

  - Silke

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