Lukas Barth
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Lukas Barthさんの最近のアクティビティ-
Lukas Barthさんがコメントを作成しました:
Hi Matthias, Thanks for your reply. I missed the part about the left-hand side not being allowed to contain any constants, so Gurobi is right here! While these "constraints" are certainly nonsense,...
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Lukas Barthさんが投稿を作成しました:
Suspected bug in LP parser: Constraint without variables introduces new variables
回答済みI think I found a bug in Gurobi 9.0.3. Take this example.lp file: Maximize xSubject To test: 10 >= 5Bounds 0 <= x <= 5Generals xEnd If I run from gurobipy import readm = read('example.lp')print...
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Lukas Barthさんがコメントを作成しました:
Hi Jaromlł, Thanks. The variables for which bounds were inferred were indeed variables of my model. Putting some reasonable upper bounds on them solved the problem with the huge bounds after presol...
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Lukas Barthさんがコメントを作成しました:
Thanks again! Indeed, presolving seems to introduce some large variable bounds: gurobi> m = read("gurobi.mps")Read MPS format model from file gurobi.mpsReading time = 1.51 seconds: 663497 rows, 331...
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Lukas Barthさんがコメントを作成しました:
Hi Jaromił, This is the size of my model: Optimize a model with 663497 rows, 331973 columns and 2427819 nonzerosModel fingerprint: 0xb4fd3671Model has 296 SOS constraintsVariable types: 111748 cont...
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Lukas Barthさんが投稿を作成しました:
What are postponed nodes?
回答済みI'm currently optimizing a MIP model, and this is how my MIP log looks like: Nodes | Current Node | Objective Bounds | WorkExpl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time0 0 73...
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Lukas Barthさんがコメントを作成しました:
Thanks Jaromił. The main reason I was hoping to get around coding a callback is the issue referenced here: https://support.gurobi.com/hc/en-us/community/posts/360067079431-Callback-Setsolution-from...
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Lukas Barthさんがコメントを作成しました:
Hi Jaromił, Thanks for your reply. I'm sorry, I think I did not describe my situation correctly. I do not know any variable assignments before optimization (otherwise I could just make them constan...
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Lukas Barthさんが投稿を作成しました:
Tell Gurobi about optimal variable value depending on a set of other variables
進行中I'm modelling a scheduling problem (see below for a concrete example). In this problem, I have a set of (integral) variables modelling the start times assigned to jobs. I have a second set of binar...
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Lukas Barthさんが投稿を作成しました:
Analyzing the conditioning of a MIP
回答済みHello everyone, I have several different MIP formulations for the same problem, which I am currently benchmarking against each other. One thing I would like to look at is the conditioning of the re...