the GAP is big

Answered

chen hanping

• July 27, 2023 05:34

I have formulated a mixed-integer linear model with the number of variables shown in the figure. After running the optimization overnight, I observed that the gap is consistently at 55% for an extended period, with no significant improvement in convergence. I am seeking advice on how to address this issue and achieve better convergence results.

1

• 

  David Torres Sanchez

  Gurobi Staff

  • July 31, 2023 11:01

  Hi,

  There are some parameters you may want to try:

  • MIPFocus = 1, 2, or 3.
  • Cuts = 2,
  • Method = 1

  You may also want to revise your formulation and strengthen it.
  You can check out our Tech Talk & Chat– Converting Weak to Strong MIP Formulations, Part II.

  Cheers, 
  David

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