Cheng-Lung Chen

Gurobi-versary
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Activity overview

Latest activity by Cheng-Lung Chen

  • Cheng-Lung Chen commented,

    1. Community
    2. Algorithms
    3. Can we add user cuts on root node only?

    Hi Jaromił, Thank you so much and save my life!!!

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    • Cheng-Lung Chen
    • 0 votes

  • Cheng-Lung Chen created a post,

    Can we add user cuts on root node only?

    Answered
    1. Community
    2. Algorithms

    Hi,  I believe this is an easy question but I couldn't find any related post. In my branch-and-cut, below is how I code the user cut callback if where == GRB.Callback.MIPNODE: status = MyModel.c...

    • Cheng-Lung Chen
    • 3 followers
    • 2 comments
    • 0 votes

  • Cheng-Lung Chen commented,

    1. Community
    2. Algorithms
    3. Branch-and-cut performance and PreCrush

    Hello Maliheh, Thanks for responding! I did a couple of experiment and you are correct. The Gurobi presolve, heuristics and cuts are so powerful that the optimization performance is actually better...

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    • Cheng-Lung Chen
    • 0 votes

  • Cheng-Lung Chen created a post,

    Branch-and-cut performance and PreCrush

    Answered
    1. Community
    2. Algorithms

    Hello,  I am implementing a branch-and-cut algorithm with my own user cuts. Initially, I forgot to change the PreCrush parameter to 1. I quickly realize this is necessary for user cut callback and ...

    • Cheng-Lung Chen
    • 2 followers
    • 2 comments
    • 0 votes