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Timothy van Bremen

5 accepted papers

2022

Domain-Lifted Sampling for Universal Two-Variable Logic and Extensions

AAAI 2022technical

Given a first-order sentence ? and a domain size n, how can one sample a model of ? on the domain {1, . . . , n} efficiently as n scales? We consider two variants of this problem: the uniform sampling regime, in which the goal is to sample a model uniformly at random, and the symmetric weighted samp…

2021

Fast Algorithms for Relational Marginal Polytopes

IJCAI 2021poster

We study the problem of constructing the relational marginal polytope (RMP) of a given set of first-order formulas. Past work has shown that the RMP construction problem can be reduced to weighted first-order model counting (WFOMC). However, existing reductions in the literature are intractable in p…

2021

Symmetric Component Caching for Model Counting on Combinatorial Instances

AAAI 2021technical

Given a propositional formula ψ, the model counting problem, also referred to as #SAT, seeks to compute the number of satisfying assignments (or models) of ψ. Modern search-based model counting algorithms are built on conflict-driven clause learning, combined with the caching of certain subformulas…

2020

Approximate Weighted First-Order Model Counting: Exploiting Fast Approximate Model Counters and Symmetry

IJCAI 2020poster

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 of a sentence given an unweighted first-order model counting oracle. The algorithm has applications to inference in a variety…

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