Learning Bayesian nets that perform well

  • Authors:
  • Russell Greiner;Adam J. Grove;Dale Schuurmans

  • Affiliations:
  • Siemens Corporate Research, Princeton, NJ;NEC Research Institute, Princeton, NJ;Inst. for Research in Cognitive Science, University of Pennsylvania, Philadelphia, PA

  • Venue:
  • UAI'97 Proceedings of the Thirteenth conference on Uncertainty in artificial intelligence
  • Year:
  • 1997

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Abstract

A Bayesian net (BN) is more than a succinct way to encode a probabilistic distribution; it also corresponds to a function used to answer queries. A BN can therefore be evaluated by the accuracy of the answers it returns. Many algorithms for learning BNs, however, attempt to optimize another criterion (usually likelihood, possibly augmented with a regularizing term), which is independent of the distribution of queries that are posed. This paper takes the "performance criteria" seriously, and considers the challenge of computing the BN whose performance -- read "accuracy over the distribution of queries" -- is optimal. We show that many aspects of this learning task are more difficult than the corresponding subtasks in the standard model.