2005 | OriginalPaper | Buchkapitel
Which Is the Best Multiclass SVM Method? An Empirical Study
verfasst von : Kai-Bo Duan, S. Sathiya Keerthi
Erschienen in: Multiple Classifier Systems
Verlag: Springer Berlin Heidelberg
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Multiclass SVMs are usually implemented by combining several two-class SVMs. The one-versus-all method using winner-takes-all strategy and the one-versus-one method implemented by max-wins voting are popularly used for this purpose. In this paper we give empirical evidence to show that these methods are inferior to another one-versus-one method: one that uses Platt’s posterior probabilities together with the pairwise coupling idea of Hastie and Tibshirani. The evidence is particularly strong when the training dataset is sparse.