Unbounded objective

ユーザーの入力を待っています。

Jason Hu

2021年07月22日 17:05

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I'm solving a minimization problem where the objective function is the sum of two 1-norms of vectors and there are no constraints. The log indicates a lot of nodes are being "postponed", before eventually stopping and giving an objective function of some massive number, usually around 1e31. The log then says "model unbounded" and "unbounded objective function". However, I can't understand how this can be possible as it is clearly bounded below by 0. Also, when I check value(objective), it returns a much more realistic value, usually around 10. Does someone have a possible reason for these discrepancies? 

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  Simranjit Kaur

  • Gurobi Staff

  2024年12月06日 00:29

  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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  Jaromił Najman

  • Gurobi Staff

  2021年08月02日 13:24

  Hi Jason,

  This sounds like your model suffers from severe numerical issues. Please have a look at Does my model have numerical issues?

  Could you also post the log of the run? This would make it easier to investigate the problem.

  Best regards,
  Jaromił

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