Assia Kamal-idrissi

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Latest activity by Assia Kamal-idrissi

  • Assia Kamal-idrissi created a post,

    Running time increase when running multiple models

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    1. Community
    2. Programming

    Hello, I'm running the same model for different instances files in separated files independently using Jupyter. For each instance, I run the model 5 times with time limit 3600 for each iteration. S...

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  • Assia Kamal-idrissi commented,

    1. Community
    2. Modeling
    3. Enforce binary variable to zero when the sum is negative

    Thank you for clarifying the formulation. I will add your suggestion. Meanwhile, I try to formulate it as follows: arc_k = {(i, j) for i in nodes for j in nodes if i != j} xx= mdl.addVars(arc_k, vt...

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  • Assia Kamal-idrissi commented,

    1. Community
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    3. Enforce binary variable to zero when the sum is negative

    Hi Ronald, Thank you so much for your help. I got the following status: Model is infeasible Best objective -, best bound -, gap - Set parameter TimeLimit to value 3600 No optimal solution found run...

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  • Assia Kamal-idrissi created a post,

    Enforce binary variable to zero when the sum is negative

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    1. Community
    2. Modeling

    Hi, I'm trying to model the CVRP problem with flow formulation. I'm working with two fleets where the capacity of one can be less than the demand of the customer in some cases (fleet with capacity ...

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  • Assia Kamal-idrissi commented,

    1. Community
    2. Modeling
    3. Small model that takes more time

    Hi Elisabeth, Thank you for this explanation. By setting Threads to 0, it takes more than 8812s to get the optimal result. However, the optimal result can be retrieved in the following line with 19...

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  • Assia Kamal-idrissi commented,

    1. Community
    2. Modeling
    3. Small model that takes more time

    Hi Riley, Thank you for your reply. If understand from the response below that more Threads make Gurobi spends more time. The machine has 112 Threads. Would you please tell me how many threads I ha...

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  • Assia Kamal-idrissi commented,

    1. Community
    2. Modeling
    3. Small model that takes more time

    When I kept default value of the parameters Heuristics, Cuts, PreSparsify and NodefileStart. there is a heuristic solution to start:   Set parameter Presolve to value 0 Set parameter Threads to val...

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  • Assia Kamal-idrissi commented,

    1. Community
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    3. Small model that takes more time

    Hi, Thank you for your reply. The model fingerprint is 0xf11e235e as showed in my first post. While 0xbf1c0f3c is the model with minimizing distance rather than time. Here is the ongoing solving wi...

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  • Assia Kamal-idrissi commented,

    1. Community
    2. Modeling
    3. Small model that takes more time

    Hi Riley, Thank you for these insightful explanations. Now, I understand why the nonzero variables increases. For the paper, I working on minimizing time rather than distance (Time = Distance * Spe...

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  • Assia Kamal-idrissi commented,

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    2. Modeling
    3. Small model that takes more time

    Hi Riley, Thank you. I've just finished to upload the zip to Google Drive. Here is the link: https://drive.google.com/file/d/1sN2f3QfLpuFkjwrBT9knYejXJRosgxp2/view?usp=sharing Thank you. Assia

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