Learning the Parameters of Probabilistic Logic Programs from Interpretations

produced by: Data & Web Mining Lab
author: Ingo Thon, KU Leuven
published: Nov. 30, 2011,   recorded: September 2011,   views: 2786


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ProbLog is a recently introduced probabilistic extension of the logic programming language Prolog, in which facts can be annotated with the probability that they hold. The advantage of this probabilistic language is that it naturally expresses a generative process over interpretations using a declarative model. Interpretations are relational descriptions or possible worlds. This paper introduces a novel parameter estimation algorithm LFI-ProbLog for learning ProbLog programs from partial interpretations. The algorithm is essentially a Soft-EM algorithm. It constructs a propositional logic formula for each interpretation that is used to estimate the marginals of the probabilistic parameters. The LFI-ProbLog algorithm has been experimentally evaluated on a number of data sets that justifi es the approach and shows its e ffectiveness.

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