Lennart Lahrs
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Activity overview
Latest activity by Lennart Lahrs-
Lennart Lahrs created an article,
Gurobi in Embedded Systems
With solve times shorter than ever and more supported model types, including non-convex MINLP, Gurobi is increasingly considered for applications with very short runtime requirements (sub-second) o...
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Lennart Lahrs created an article,
Solving batches of models with short model runtimes: Efficient API usage, parameter tuning, and deployment considerations
Some Gurobi-powered applications solve large batches of models with very short individual model runtimes. Taking special care with API usage and parameter tuning is sometimes overlooked because the...
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Lennart Lahrs created an article,
Incident response for errors related to WLS (Web License Service)
This article is a reference for maintainers of commercial production applications using WLS licenses. Unless your commercial application is blocked in production, do not mark your ticket as a produ...
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Lennart Lahrs commented,
Both ObjNRelTol and ObjNAbsTol are considered by MIPs, while for pure LPs only ObjNAbsTol is considered and handled differently. The page Working With Multiple Objectives is another good reference ...
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Lennart Lahrs commented,
Correct, this method is referred to as epsilon constraint method.
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Lennart Lahrs commented,
Hi Arun,When using hierarchical multi-objective with two objectives, by default you will receive only a single solution which is optimal with respect to the highest priority objective and also opti...
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Lennart Lahrs commented,
Hi Margi, The Gurobi log outputs the number of continuous, integer, and binary variables.Note that any binary variable is also considered an integer variable. E.g.: Optimize a model with 0 rows, 3 ...
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Lennart Lahrs commented,
I suggest, yes. You could also try more aggressive Cuts settings, which might help to come to a conclusion more quickly.
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Lennart Lahrs commented,
Hi Andrew, I recommend you experiment with MIPFocus, Heuristics, and NoRelHeurTime. With MIPFocus and Heuristics, you can direct Gurobi to prioritize finding feasible solutions. Although your model...
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Lennart Lahrs commented,
Hi Koustav, Unfortunately, I was not able to reproduce the error. Can you please share which gurobipy and Python version you are using? Did you already add any other code to the code snippet above?...