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Efficient EM Learning with Tabulation for Parameterized Logic Programs

  • Yoshitaka Kameya
  • Taisuke Sato
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1861)

Abstract

We have been developing a general symbolic-statistical modeling language [6,19,20] based on the logic programming framework that semantically unifies (and extends) major symbolic-statistical frameworks such as hidden Markov models (HMMs) [18], probabilistic context-free grammars (PCFGs) [23] and Bayesian networks [16]. The language, PRISM, is intended to model complex symbolic phenomena governed by rules and probabilities based on the distributional semantics [19]. Programs contain statistical parameters and they are automatically learned from randomly sampled data by a specially derived EM algorithm, the graphical EM algorithm. It works on support graphs representing the shared structure of explanations for an observed goal. In this paper, we propose the use of tabulation technique to build support graphs, and show that as a result, the graphical EM algorithm attains the same time complexity as specilized EM algorithms for HMMs (the Baum-Welch algorithm [18]) and PCFGs (the Inside-Outside algorithm [1]).

Keywords

Bayesian Network Logic Program Logic Programming Predicate Symbol Ground Atom 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Yoshitaka Kameya
    • 1
  • Taisuke Sato
    • 1
  1. 1.Dept. of Computer Science, Graduate School of Information Science and EngineeringTokyo Institute of TechnologyTokyoJapan

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