CEDRIC JUSTIN
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Latest activity by CEDRIC JUSTIN-
CEDRIC JUSTIN created a post,
What you can do is to solve the LP relaxation of your model with column generation.
AnsweredLooking for advice here. I have a column generation model to solve a crew pairing problem (a set partitioning problem). I am solving the LP relaxation of the model at the root using column generati...
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CEDRIC JUSTIN commented,
Thanks Marika for all your insights. I had started doing the slack-variable relaxation by hand before you replied and that allowed me more customization. I'll use indeed a multi-objective optimizat...
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CEDRIC JUSTIN commented,
Marika, Thanks for your feedback. I have uploaded some of the code I am using Gurobi 10 as shown below in the console Gurobi Optimizer version 10.0.0 build v10.0.0rc2 (win64)CPU model: 11th Gen Int...
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CEDRIC JUSTIN commented,
This makes sense, thanks Marika. I have another related question to minrelax: gurobi_model.feasRelax(relaxobjtype=2, minrelax=False, vars=None, lbpen=None, ubpen=None, constrs=torelax, rhspen=conpe...
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CEDRIC JUSTIN commented,
Yes, typo on my part, I want to switch from "=" equality to '>=" inequality constraints i.e. going from a set-partitioning problem to a set covering problem. So if I understand correctly, the lines...
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CEDRIC JUSTIN commented,
Thank you Marika. Why are you changing twice con.sense ? I understand going from "=" to "<" but not sure why you replace it again with equality later. What is the purpose? For ArtN and ArtP, I had ...
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CEDRIC JUSTIN created a post,
Infeasibility -> Constraint Relaxation
AnsweredHello All, I am trying to look into the documentation how to solve an infeasibility issue. In particular, to relax my problem I would like the following equality constraint to become a "greater or ...
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CEDRIC JUSTIN created a post,
Practical way to change MIPFocus during Execution
AnsweredI have a code running for several days and I am wondering if there is a way to change MIPFocus from 1 to 3 during execution. Callback do not work to change model parameter and terminating and resta...