Warm start in callback to improve solution

回答済み

Devaraja Vignesh Radha Krishnan

2020年02月24日 04:01

• 
• 
• 

Hello,

I have developed a C++ code where a relaxation of original formulation is solved and violated inequalities are separated and added via lazy cuts.

I have also developed a heuristic technique which could possibly improve the incumbent solution in a branch-and -bound node. As such, I am trying to implement something similar to warm start (start attribute) in callback. Then I can use the heuristic to suggest a solution that might be better than incumbent in callback. This could help me to improve my runtime.

Directly using "variable.set(GRB_DoubleAttr_Start, 1.0);" does not seem to work in callback function. So my question is this:

Is there a way use start attribute (or something synonymous) in callback function?

I would really appreciate any feedback. Thank you in advance.

0

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:17 編集済み

  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?.
• 

  Silke Horn

  • Gurobi Staff

  2020年03月03日 12:54

  Have you looked at the method GRBCallback::setSolution?

  0
• 

  Devaraja Vignesh Radha Krishnan

  2020年03月13日 00:43

  • 
  • 
  • 

  Hi,

  Thank you so much for the helpful reply. I tried setsolution after your response. It worked for me perfectly. However, I am not able to use it multiple times as it results in error code 10011. I only needed to do it once, so it works for my purpose. I really appreciate the comment.

  0

投稿コメントは受け付けていません。