Number of Solutions

Comments

4 comments

  • Matthias Miltenberger

    Hi Gianluca,

    This is not a standard Gurobi output. What tool did you use to do the optimization?

    Cheers,
    Matthias

     

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  • Gianluca Sabbatini

    Pyomo environment

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  • Gianluca Sabbatini

    I enclose here the full output of the optimization problem:

     

    # ==========================================================
    # = Solver Results =
    # ==========================================================
    # ----------------------------------------------------------
    # Problem Information
    # ----------------------------------------------------------
    Problem:
    - Name: x1353727
    Lower bound: 1794548.847195477
    Upper bound: 1794548.847195477
    Number of objectives: 1
    Number of constraints: 13480377
    Number of variables: 1353727
    Number of binary variables: 5805
    Number of integer variables: 5805
    Number of continuous variables: 1347922
    Number of nonzeros: 40421871
    Sense: minimize
    # ----------------------------------------------------------
    # Solver Information
    # ----------------------------------------------------------
    Solver:
    - Status: ok
    Return code: 0
    Message: Model was solved to optimality (subject to tolerances), and an optimal solution is available.
    Termination condition: optimal
    Termination message: Model was solved to optimality (subject to tolerances), and an optimal solution is available.
    Wall time: 29.109039068222046
    Error rc: 0
    Time: 114.57288098335266
    # ----------------------------------------------------------
    # Solution Information
    # ----------------------------------------------------------
    Solution:
    - number of solutions: 0
    number of solutions displayed: 0

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  • Matthias Miltenberger

    Hmm, this looks like an issue on Pyomo's side. Can you try writing the problem to MPS format and then solving it with Gurobi directly to see whether there is something wrong.

    Cheers,
    Matthias

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