Search Results for author: Johannes K. Fichte

Found 16 papers, 3 papers with code

IASCAR: Incremental Answer Set Counting by Anytime Refinement

no code implementations13 Nov 2023 Johannes K. Fichte, Sarah Alice Gaggl, Markus Hecher, Dominik Rusovac

However, navigating through parts of the solution space requires counting many times, which is expensive in theory.

Solving Projected Model Counting by Utilizing Treewidth and its Limits

no code implementations30 May 2023 Johannes K. Fichte, Markus Hecher, Michael Morak, Patrick Thier, Stefan Woltran

Inspired by the observation that the so-called "treewidth" is one of the most prominent structural parameters, our algorithm utilizes small treewidth of the primal graph of the input instance.

2k

A Quantitative Symbolic Approach to Individual Human Reasoning

no code implementations10 May 2022 Emmanuelle Dietz, Johannes K. Fichte, Florim Hamiti

Cognitive theories for reasoning are about understanding how humans come to conclusions from a set of premises.

Rushing and Strolling among Answer Sets -- Navigation Made Easy

no code implementations14 Dec 2021 Johannes K. Fichte, Sarah Alice Gaggl, Dominik Rusovac

For example, when a user aims to identify a specific answer set according to her needs, or requires the total number of diverging solutions to comprehend probabilistic applications such as reasoning in medical domains.

Navigate

The Model Counting Competition 2020

no code implementations2 Dec 2020 Johannes K. Fichte, Markus Hecher, Florim Hamiti

We hope that the results can be a good indicator of the current feasibility of model counting and spark many new applications.

Solving the Steiner Tree Problem with few Terminals

1 code implementation9 Nov 2020 Johannes K. Fichte, Markus Hecher, Andre Schidler

We show that admissibility is indeed weaker than consistency and establish correctness of the DS* algorithm when using an admissible heuristic function.

Steiner Tree Problem

A Time Leap Challenge for SAT Solving

no code implementations5 Aug 2020 Johannes K. Fichte, Markus Hecher, Stefan Szeider

We compare the impact of hardware advancement and algorithm advancement for SAT solving over the last two decades.

Towards Faster Reasoners By Using Transparent Huge Pages

2 code implementations29 Apr 2020 Johannes K. Fichte, Norbert Manthey, Julian Stecklina, André Schidler

Huge pages allow to reduce the overhead that is required to translate memory addresses between the virtual memory of the operating system and the physical memory of the hardware.

Management

Inconsistency Proofs for ASP: The ASP-DRUPE Format

no code implementations24 Jul 2019 Mario Alviano, Carmine Dodaro, Johannes K. Fichte, Markus Hecher, Tobias Philipp, Jakob Rath

Verifying whether a claimed answer set is formally a correct answer set of the program can be decided in polynomial time for (normal) programs.

Counting Complexity for Reasoning in Abstract Argumentation

no code implementations28 Nov 2018 Johannes K. Fichte, Markus Hecher, Arne Meier

In this paper, we consider counting and projected model counting of extensions in abstract argumentation for various semantics.

Abstract Argumentation

Exploiting Treewidth for Projected Model Counting and its Limits

no code implementations14 May 2018 Johannes K. Fichte, Michael Morak, Markus Hecher, Stefan Woltran

It runs in time $O({2^{2^{k+4}} n^2})$ where k is the treewidth and n is the input size of the instance.

DynASP2.5: Dynamic Programming on Tree Decompositions in Action

1 code implementation28 Jun 2017 Johannes K. Fichte, Markus Hecher, Michael Morak, Stefan Woltran

In this paper, we describe underlying concepts of our new implementation (DynASP2. 5) that shows competitive behavior to state-of-the-art ASP solvers even for finding just one solution when solving problems as the Steiner tree problem that have been modeled in ASP on graphs with low treewidth.

Steiner Tree Problem

Default Logic and Bounded Treewidth

no code implementations28 Jun 2017 Johannes K. Fichte, Markus Hecher, Irina Schindler

In this paper, we study Reiter's propositional default logic when the treewidth of a certain graph representation (semi-primal graph) of the input theory is bounded.

Strong Backdoors for Default Logic

no code implementations19 Feb 2016 Johannes K. Fichte, Arne Meier, Irina Schindler

In this paper, we introduce a notion of backdoors to Reiter's propositional default logic and study structural properties of it.

Dual-normal Logic Programs - the Forgotten Class

no code implementations20 Jul 2015 Johannes K. Fichte, Miroslaw Truszczynski, Stefan Woltran

Identifying classes of programs for which the consistency problem is in NP is of interest from the theoretical standpoint and can potentially lead to improvements in the design of answer set programming solvers.

Translation

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