Empirical evaluation of approximation algorithms for probabilistic decoding

  • Authors:
  • Irina Rish;Kalev Kask;Rina Dechter

  • Affiliations:
  • Department of Information and Computer Science, University of California, Irvine;Department of Information and Computer Science, University of California, Irvine;Department of Information and Computer Science, University of California, Irvine

  • Venue:
  • UAI'98 Proceedings of the Fourteenth conference on Uncertainty in artificial intelligence
  • Year:
  • 1998

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Abstract

It was recently shown that the problem of decoding messages transmitted through a noisy channel can be formulated as a belief updating task over a probabilistic network [14]. Moreover, it was observed that iterative application of the (linear time) belief propagation algorithm designed for polytrees [15] outperformed state of the art decoding algorithms, even though the corresponding networks may have many cycles. This paper demonstrates empirically that an approximation algorithm approx-mpe for solving the most probable explanation (MPE) problem, developed within the recently proposed mini-bucket elimination framework [4], outperforms iterative belief propagation on classes of coding networks that have bounded induced width. Our experiments suggest that approximate MPE decoders can be good competitors to the approximate belief updating decoders.