Maliheh Aramon

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Activity overview

Latest activity by Maliheh Aramon

  • Maliheh Aramon commented,

    1. Community
    2. Programming
    3. Gurobi status code

    Hi,  The gurobipy module was restructured a bit for version 12.0. This should do the trick in version 12.0: from gurobipy import GRBd = {getattr(GRB.Status, k): k for k in GRB.Status.__dir__() if "...

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  • Maliheh Aramon commented,

    1. Community
    2. Programming
    3. Change sets in a optimization loop

    I need to build the large model once and, solved it in each iteration only the variables associated to pair (key, value) of my dictionary. What happens to the variables that are not part of the k...

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  • Maliheh Aramon commented,

    1. Community
    2. Programming
    3. Change sets in a optimization loop

    Hi,  I am not sure that I fully understand your question. Given your snippet, it is not clear what you changed on the model in each iteration of the "for" loop. Would you like to build and solve a ...

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  • Maliheh Aramon commented,

    1. Community
    2. Modeling
    3. Exploring Multi-Objective MILP Techniques in Gurobi

    Hi Benjamin, As outlined in the documentation on multiple objectives, Gurobi provides an API to solve multi-objective optimization problems using three main approaches: 1) blending the objectives, ...

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  • Maliheh Aramon commented,

    1. Community
    2. Algorithms
    3. how to reduce the factor NZ efficiently?

    Hi Yanda,  Thank you for contacting us. You can check the "Performance Tuning for Gurobi's Barrier Algorithm" presentation to learn about different strategies to improve barrier performance.  Param...

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  • Maliheh Aramon commented,

    1. Community
    2. Modeling
    3. NoRel and setting time limits

    Hi,  To run the NoRel heuristic, you must set either NoRelHeurTime or NoRelHeurWork parameters. You can set the NoRelHeurTime parameter to a large value and the SolutionLimit parameter to 1. This w...

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  • Maliheh Aramon commented,

    1. Community
    2. Programming
    3. Extracting MIP Gap of my Hotstart Solution.

    Hi,  The MIPGap attribute is available when the optimization is terminated because of hitting a termination criterion or proving the optimality. This attribute reports the relative gap between the ...

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    • Maliheh Aramon
    • 1 vote

  • Maliheh Aramon commented,

    1. Community
    2. Programming
    3. Drawing Relation between two set of variables

    You need to add the following constraints where \(M\) is a sufficiently large value covering the domain of the \(Y\) variables. \(Y_i \leq X_i + MZ_i\) \(Y_i \geq X_i - MZ_i\)

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  • Maliheh Aramon commented,

    1. Community
    2. Programming
    3. Drawing Relation between two set of variables

    Hi Sesha,  The results look consistent with the constraints implemented. The variable \(X_{11,00}\) equals a non-zero value (\(0.333\)) and its associated \(Y_{11,00}\) variable equals \(76\) such ...

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  • Maliheh Aramon commented,

    1. Community
    2. Algorithms
    3. Speed linear optimization model

    Hi Claire, Some general recommendations you could consider experimenting with: Use the latest Gurobi version 11.0.2. Leave the Threads parameter at the default value Consider more aggressive preso...

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