Help with incumbent

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Alejandro Arenas

2022年08月16日 00:56

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Hello everybody.

Is there any command to know how much time did Gurobi spend finding the first feasible solution for a MILP?

Thank you very much.

Alejandro

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  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:30

  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 try Gurobot, our chatbot interface offering instant, expert-level support.
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  Jaromił Najman

  • Gurobi Staff

  2022年08月16日 08:03

  Hi Alejandro,

  There is no built-in method or attribute to get this information, but it can be obtained with callbacks.

  One example code might looks something like

  import gurobipy as gp
  from gurobipy import GRB
  
  def mycallback(model,where):
    if where == GRB.Callback.MIP:
      solcnt = model.cbGet(GRB.Callback.MIP_SOLCNT)
      if solcnt == 1:
        runtime = model.cbGet(GRB.Callback.RUNTIME)
        print("Found first incumbent after %f seconds."%(runtime))
  
  m = gp.read("myLP.lp")
  m.optimize(mycallback)

  Best regards, 
  Jaromił

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  Alejandro Arenas

  2022年08月16日 22:49

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  Thank you!

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