Search Results for author: Jannik Irmai

Found 5 papers, 1 papers with code

Box Facets and Cut Facets of Lifted Multicut Polytopes

no code implementations26 Feb 2024 Lucas Fabian Naumann, Jannik Irmai, Shengxian Zhao, Bjoern Andres

For $F = \emptyset$, the problem specializes to the multicut problem, and for $E = \tbinom{V}{2}$ to the clique partitioning problem.

Combinatorial Optimization

A 4-approximation algorithm for min max correlation clustering

1 code implementation13 Oct 2023 Holger Heidrich, Jannik Irmai, Bjoern Andres

We introduce a lower bounding technique for the min max correlation clustering problem and, based on this technique, a combinatorial 4-approximation algorithm for complete graphs.

Clustering

A Graph Multi-separator Problem for Image Segmentation

no code implementations10 Jul 2023 Jannik Irmai, Shengxian Zhao, Jannik Presberger, Bjoern Andres

We propose a novel abstraction of the image segmentation task in the form of a combinatorial optimization problem that we call the multi-separator problem.

Combinatorial Optimization Image Segmentation +1

A Polyhedral Study of Lifted Multicuts

no code implementations16 Feb 2022 Bjoern Andres, Silvia Di Gregorio, Jannik Irmai, Jan-Hendrik Lange

Recently, a lifting of multicuts from a graph $G = (V, E)$ to an augmented graph $\hat G = (V, E \cup F)$ has been proposed in the field of image analysis, with the goal of obtaining a more expressive characterization of graph decompositions in which it is made explicit also for pairs $F \subseteq \tbinom{V}{2} \setminus E$ of non-neighboring nodes whether these are in the same or distinct components.

Structured Prediction Problem Archive

no code implementations4 Feb 2022 Paul Swoboda, Bjoern Andres, Andrea Hornakova, Florian Bernard, Jannik Irmai, Paul Roetzer, Bogdan Savchynskyy, David Stein, Ahmed Abbas

In order to facilitate algorithm development for their numerical solution, we collect in one place a large number of datasets in easy to read formats for a diverse set of problem classes.

Benchmarking Structured Prediction

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