Maximizing the margin with boosting

Gunnar Rätsch, Manfred K. Warmuth

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    28 Citations (Scopus)

    Abstract

    AdaBoost produces a linear combination of weak hypotheses. It has been observed that the generalization error of the algorithm continues to improve even after all examples are classified correctly by the current linear combination, i.e. by a hyperplane in feature space spanned by the weak hypotheses. The improvement is attributed to the experimental observation that the distances (margins) of the examples to the separating hyperplane are increasing even when the training error is already zero, that is all examples are on the correct side of the hyperplane. We give an iterative version of AdaBoost that explicitly maximizes the minimum margin of the examples. We bound the number of iterations and the number of hypotheses used in the final linear combination which approximates the maximum margin hyperplane with a certain precision. Our modified algorithm essentially retains the exponential convergence properties of AdaBoost and our result does not depend on the size of the hypothesis class.

    Original languageEnglish
    Title of host publicationComputational Learning Theory - 15th Annual Conference on Computational Learning Theory, COLT 2002, Proceedings
    EditorsJyrki Kivinen, Robert H. Sloan
    PublisherSpringer Verlag
    Pages334-350
    Number of pages17
    ISBN (Electronic)354043836X, 9783540438366
    DOIs
    Publication statusPublished - 2002
    Event15th Annual Conference on Computational Learning Theory, COLT 2002 - Sydney, Australia
    Duration: 8 Jul 200210 Jul 2002

    Publication series

    NameLecture Notes in Artificial Intelligence (Subseries of Lecture Notes in Computer Science)
    Volume2375
    ISSN (Print)0302-9743

    Conference

    Conference15th Annual Conference on Computational Learning Theory, COLT 2002
    Country/TerritoryAustralia
    CitySydney
    Period8/07/0210/07/02

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