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 [BibTeX] [Marc21]
The Projectron: a Bounded Kernel-Based Perceptron
Type of publication: Idiap-RR
Citation: orabona:rr08-30
Number: Idiap-RR-30-2008
Year: 2008
Institution: IDIAP
Note: To appear in Proceedings of the 25th International Conference on Machine Learning (ICML 2008)
Abstract: We present a discriminative online algorithm with a bounded memory growth, which is based on the kernel-based Perceptron. Generally, the required memory of the kernel-based Perceptron for storing the online hypothesis is not bounded. Previous work has been focused on discarding part of the instances in order to keep the memory bounded. In the proposed algorithm the instances are not discarded, but projected onto the space spanned by the previous online hypothesis. We derive a relative mistake bound and compare our algorithm both analytically and empirically to the state-of-the-art Forgetron algorithm (Dekel et al, 2007). The first variant of our algorithm, called Projectron, outperforms the Forgetron. The second variant, called Projectron++, outperforms even the Perceptron.
Userfields: ipdmembership={vision},
Projects Idiap
Authors Orabona, Francesco
Keshet, Joseph
Caputo, Barbara
Crossref by orabona:ICML08:2008
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Total mark: 0
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