Variational bayes inference for logic-based probabilistic models on BDDs

  • Authors:
  • Masakazu Ishihata;Yoshitaka Kameya;Taisuke Sato

  • Affiliations:
  • Tokyo institute of Technology, Meguro-ku, Tokyo, Japan;Tokyo institute of Technology, Meguro-ku, Tokyo, Japan;Tokyo institute of Technology, Meguro-ku, Tokyo, Japan

  • Venue:
  • ILP'11 Proceedings of the 21st international conference on Inductive Logic Programming
  • Year:
  • 2011

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Abstract

Abduction is one of the basic logical inferences (deduction, induction and abduction) and derives the best explanations for our observation. Statistical abduction attempts to define a probability distribution over explanations and to evaluate them by their probabilities. Logic-based probabilistic models (LBPMs) have been developed as a way to combine probabilities and logic, and it enables us to perform statistical abduction. However non-deterministic knowledge like preference and frequency seems difficult to represent by logic. Bayesian inference can reflect such knowledge on a prior distribution, and variational Bayes (VB) is known as an approximation method for it. In this paper, we propose VB for logic-based probabilistic models and show that our proposed method is efficient in evaluating abductive explanations about failure in a logic circuit and a metabolic pathway.