Koen Timmermans
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Koen Timmermansさんの最近のアクティビティ-
Koen Timmermansさんがコメントを作成しました:
Hi Mario, Thank you for your explanation! Based on your Git repository I have changed my formulation to one without using the index k for the vehicles. This reduced the number of variables, constra...
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Koen Timmermansさんが投稿を作成しました:
Improving model formulation and solving time
回答済みHi! I have a task scheduling problem that I'm trying to solve using a MILP model. It closely resembles a VRPTW (Vehicle Routing Problem with Time Windows). The exact model formulation can be found ...
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Koen Timmermansさんがコメントを作成しました:
Hi Simran, Thanks for the quick reply! From what you explain, I understand why it is difficult for Gurobi to use my MIP start values for an initial feasible solution. I can make some changes to my ...
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Koen Timmermansさんがコメントを作成しました:
Hi Silke, Thank you for the quick reply! Unfortunately, the first link in your message is not working for me. And thank you for your recommended approach. If I understand you correctly, Model.cbPro...
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Koen Timmermansさんが投稿を作成しました:
MIP start did not produce a new incumbent solution with a feasible MIPStart
回答済みHi, I am using a self-written heuristic to find an initial feasible solution that I can provide to Gurobi as a MIPStart. After that I use the NoRelHeur to improve the solution before solving it fur...
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Koen Timmermansさんが投稿を作成しました:
Changing the NoRelHeurTime parameter for the NoRel Heuristic using Callbacks
進行中Hi, I'm using the No Relaxation heuristic to quickly find feasible solutions for my optimization problem, which works very well. I was wondering whether it is possible to change the NoRelHeurTime p...
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Koen Timmermansさんがコメントを作成しました:
Dear Simran, Thank you for the fast and elaborate answer! VRPTW are often complex problems to solve. One direction could be to play with the most important parameters that impact the performance o...
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Koen Timmermansさんが投稿を作成しました:
Improving solving (gap closing) time
回答済みHi! I have a task scheduling problem that I'm trying to solve using a MILP model. It closely resembles a VRPTW (Vehicle Routing Problem with Time Windows). I use binary decision variable \(x_{ijk}\...
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Koen Timmermansさんが投稿を作成しました:
Adding constraint in gurobipy-pandas with arrays of different lengths
回答済みHi, Using \(\texttt{gurobipy-pandas}\), I want to create the following constraint: \[ z_{k} \geq y_{ik} \quad \forall i \in A, k \in K \] I have created y like this (ik_values_y as a multi index): ...
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Koen Timmermansさんがコメントを作成しました:
Hi Riley, Thank you for your quick response! I hadn't thought about "reindexing" in this way yet. I will try to implement it! Best regards, Koen Timmermans