Force Gurobi to ignore timelimit until one feasible solution is found

回答済み

Felix Weidinger

2019年07月10日 10:47

• 
• 

Dear Community,

is there any possibility to set a time limit that is only considered, if a feasible solution is found. Otherwise, I want to continue the process until the first feasible solution is provided.

I am thankful for any help.

1

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:25 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

  2019年07月10日 12:11

  This can already be done by using callbacks. The callback examples on our website demonstrate how to implement a custom termination strategy: https://www.gurobi.com/resource/functional-code-examples/

   

  1
• 

  Gwyneth Butera

  • Gurobi Staff

  2019年07月18日 20:53 編集済み

  As an alternative solution to Silke's suggestion of callbacks, you can also try something like the following Python sample:

  timeLimit = 20
  try:
      m = read('b1c1s1.mps.gz')
      oldSolutionLimit = m.Params.SolutionLimit
      m.Params.SolutionLimit = 1
      m.optimize()
      m.Params.TimeLimit = timeLimit - m.getAttr(GRB.Attr.Runtime)
      m.Params.SolutionLimit = oldSolutionLimit - m.Params.SolutionLimit
      m.optimize()
  except (GurobiError, AttributeError, Exception) as e:
      print('Caught: ' + e.message)

   

  2

投稿コメントは受け付けていません。