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The Weighted First-Order Model Counting Problem (WFOMC) asks to compute the weighted sum of models of a given first-order logic sentence over a given domain. The boundary between fragments for which WFOMC can be computed in polynomial time…

Logic in Computer Science · Computer Science 2025-08-18 Qipeng Kuang , Václav Kůla , Ondřej Kuželka , Yuanhong Wang , Yuyi Wang

The Weighted First-Order Model Counting Problem (WFOMC) asks to compute the weighted sum of models of a given first-order logic sentence over a given domain. It can be solved in time polynomial in the domain size for sentences from the…

Logic in Computer Science · Computer Science 2025-12-09 Qipeng Kuang , Ondřej Kuželka , Yuanhong Wang , Yuyi Wang

Weighted First-Order Model Counting (WFOMC) computes the weighted sum of the models of a first-order theory on a given finite domain. WFOMC has emerged as a fundamental tool for probabilistic inference. Algorithms for WFOMC that run in…

Artificial Intelligence · Computer Science 2021-05-31 Sagar Malhotra , Luciano Serafini

We consider the task of weighted first-order model counting (WFOMC) used for probabilistic inference in the area of statistical relational learning. Given a formula $\phi$, domain size $n$ and a pair of weight functions, what is the…

Artificial Intelligence · Computer Science 2022-11-03 Jan Tóth , Ondřej Kuželka

We study the time complexity of the weighted first-order model counting (WFOMC) over the logical language with two variables and counting quantifiers. The problem is known to be solvable in time polynomial in the domain size. However, the…

Logic in Computer Science · Computer Science 2024-08-26 Jan Tóth , Ondřej Kuželka

It is known due to the work of Van den Broeck et al [KR, 2014] that weighted first-order model counting (WFOMC) in the two-variable fragment of first-order logic can be solved in time polynomial in the number of domain elements. In this…

Artificial Intelligence · Computer Science 2020-08-17 Ondrej Kuzelka

Weighted first-order model counting (WFOMC) is a central task in lifted probabilistic inference: It asks for the weighted sum of all models of a first-order sentence over a finite domain. A long line of work has identified domain-liftable…

Logic in Computer Science · Computer Science 2026-05-06 Shixin Sun , Astrid Klipfel , Ondřej Kuželka , Yuanhong Wang , Yi Chang

Weighted First-Order Model Counting (WFOMC) computes the weighted sum of the models of a first-order logic theory on a given finite domain. First-Order Logic theories that admit polynomial-time WFOMC w.r.t domain cardinality are called…

Logic in Computer Science · Computer Science 2022-04-13 Sagar Malhotra , Luciano Serafini

Weighted First Order Model Counting (WFOMC) is fundamental to probabilistic inference in statistical relational learning models. As WFOMC is known to be intractable in general ($\#$P-complete), logical fragments that admit polynomial time…

Artificial Intelligence · Computer Science 2025-02-27 Sagar Malhotra , Davide Bizzaro , Luciano Serafini

It was recently shown by van den Broeck at al. that the symmetric weighted first-order model counting problem (WFOMC) for sentences of two-variable logic FO2 is in polynomial time, while it is Sharp-P_1 complete for some FO3-sentences. We…

Logic in Computer Science · Computer Science 2018-04-27 Antti Kuusisto , Carsten Lutz

Weighted model counting (WMC) is the task of computing the weighted sum of all satisfying assignments (i.e., models) of a propositional formula. Similarly, weighted model sampling (WMS) aims to randomly generate models with probability…

Artificial Intelligence · Computer Science 2024-06-17 Yuanhong Wang , Juhua Pu , Yuyi Wang , Ondřej Kuželka

In this paper we study lifted inference for the Weighted First-Order Model Counting problem (WFOMC), which counts the assignments that satisfy a given sentence in first-order logic (FOL); it has applications in Statistical Relational…

Artificial Intelligence · Computer Science 2019-11-12 Eric Gribkoff , Guy Van den Broeck , Dan Suciu

The FO Model Counting problem (FOMC) is the following: given a sentence $\Phi$ in FO and a number $n$, compute the number of models of $\Phi$ over a domain of size $n$; the Weighted variant (WFOMC) generalizes the problem by associating a…

Databases · Computer Science 2015-06-02 Paul Beame , Guy Van den Broeck , Eric Gribkoff , Dan Suciu

We study the symmetric weighted first-order model counting task and present ApproxWFOMC, a novel anytime method for efficiently bounding the weighted first-order model count in the presence of an unweighted first-order model counting…

Artificial Intelligence · Computer Science 2020-01-16 Timothy van Bremen , Ondrej Kuzelka

Bonnet et al. (FOCS 2020) introduced the graph invariant twin-width and showed that many NP-hard problems are tractable for graphs of bounded twin-width, generalizing similar results for other width measures, including treewidth and…

Data Structures and Algorithms · Computer Science 2022-06-06 Robert Ganian , Filip Pokrývka , André Schidler , Kirill Simonov , Stefan Szeider

We investigate lifted inference on ordered domains with predecessor relations, where the elements of the domain respect a total (cyclic) order, and every element has a distinct (clockwise) predecessor. Previous work has explored this…

Artificial Intelligence · Computer Science 2025-07-28 Kuncheng Zou , Jiahao Mai , Yonggang Zhang , Yuyi Wang , Ondřej Kuželka , Yuanhong Wang , Yi Chang

We introduce tree-width for first order formulae \phi, fotw(\phi). We show that computing fotw is fixed-parameter tractable with parameter fotw. Moreover, we show that on classes of formulae of bounded fotw, model checking is fixed…

Logic in Computer Science · Computer Science 2019-03-14 Isolde Adler , Mark Weyer

First-order model counting (FOMC) is a computational problem that asks to count the models of a sentence in finite-domain first-order logic. In this paper, we argue that the capabilities of FOMC algorithms to date are limited by their…

Logic in Computer Science · Computer Science 2023-06-08 Paulius Dilkas , Vaishak Belle

We consider a weighted counting problem on matchings, denoted $\textrm{PrMatching}(\mathcal{G})$, on an arbitrary fixed graph family $\mathcal{G}$. The input consists of a graph $G\in \mathcal{G}$ and of rational probabilities of existence…

Computational Complexity · Computer Science 2023-01-10 Antoine Amarilli , Mikaël Monet

We study the model-checking problem for first- and monadic second-order logic on finite relational structures. The problem of verifying whether a formula of these logics is true on a given structure is considered intractable in general, but…

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