IPF for discrete chain factor graphs

  • Authors:
  • Wim Wiegerinck;Tom Heskes

  • Affiliations:
  • SNN, Department of Biophysics, Nijmegen University, Nijmegen, the Netherlands;SNN, Department of Biophysics, Nijmegen University, Nijmegen, the Netherlands

  • Venue:
  • UAI'02 Proceedings of the Eighteenth conference on Uncertainty in artificial intelligence
  • Year:
  • 2002

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Abstract

Iterative Proportional Fitting (IPF), combined with EM, is commonly used as an algorithm for likelihood maximization in undirected graphical models. In this paper, we present two iterative algorithms that generalize upon IPF. The first one is for likelihood maximization in discrete chain factor graphs, which we define as a wide class of discrete variable models including undirected graphical models and Bayesian networks, but also chain graphs and sigmoid belief networks. The second one is for conditional likelihood maximization in standard undirected models and Bayesian networks. In both algorithms, the iteration steps are expressed in closed form. Numerical simulations show that the algorithms are competitive with state of the art methods.