Help with incumbent

Answered

Alejandro Arenas

• August 16, 2022 00:56

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

0

• 

  Jaromił Najman

  Gurobi Staff

  • August 16, 2022 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

  0
• 

  Alejandro Arenas

  • August 16, 2022 22:49

  

  

  

  Thank you!

  0

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