English

Suboptimal behaviour of Bayes and MDL in classification under misspecification

Statistics Theory 2007-07-16 v1 Information Theory Machine Learning math.IT Statistics Theory

Abstract

We show that forms of Bayesian and MDL inference that are often applied to classification problems can be *inconsistent*. This means there exists a learning problem such that for all amounts of data the generalization errors of the MDL classifier and the Bayes classifier relative to the Bayesian posterior both remain bounded away from the smallest achievable generalization error.

Keywords

Cite

@article{arxiv.math/0406221,
  title  = {Suboptimal behaviour of Bayes and MDL in classification under misspecification},
  author = {Peter Grunwald and John Langford},
  journal= {arXiv preprint arXiv:math/0406221},
  year   = {2007}
}

Comments

This is a slightly longer version of our paper at the COLT (Computational Learning Theory) 2004 Conference, containing two extra pages of discussion of the main results

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