Yaroslav Pylyavskyy
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Activity overview
Latest activity by Yaroslav Pylyavskyy-
Yaroslav Pylyavskyy commented,
The reading of data that are used to construct the model is the same. I read data from an Excel file, the latest version has two additional sheets compared to the older. These additional data are u...
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Yaroslav Pylyavskyy commented,
Hi Marika, Thank you for your quick reply! Checking both models would be extremely time-consuming as the model has 200k variables and 11k constraints. Maybe I will check when I find some free time....
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Yaroslav Pylyavskyy created a post,
Different best bounds for different python scripts that run precisely the same model for the same problem
OngoingHi, I am solving scheduling problems with Python and Gurobi. Due to script being regularly updated, I save major updates as newer versions. Part of my script is a function which uses Gurobi to impl...
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Yaroslav Pylyavskyy commented,
Thanks Jaromil! Indeed, that makes sense. Best regards, Yaroslav
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Yaroslav Pylyavskyy commented,
Hi Jaromil, I just wanted to report to you something odd that I noticed regarding gurobi's performance between pulp and gurobipy. It seems that gurobi's performance is better when using pulp, inste...
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Yaroslav Pylyavskyy commented,
Hi Jaromil, Yes, I found which constraints were responsible for infeasibility. By the way, for instance 10 I am not using Lagrangian relaxation as the model is feasible. However, the solver gets st...
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Yaroslav Pylyavskyy commented,
Hi Jaromil, Thank you for your reply and the resources provided. Yes, I tried without Lagrangian relaxation but it gives an infeasible solution. That is why I use it actually, to relax some hard co...
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Yaroslav Pylyavskyy created a post,
Unable to find optimal solution for some instances
AnsweredHi, I am dealing with a scheduling problem and I use pulp and gurobi to solve it. While the solver works very well for some instances, for others it can't find the optimal solution even when runnin...