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  Conformal Multi-Instance Kernels

Blaschko, M., & Hofmann, T. (2006). Conformal Multi-Instance Kernels. In NIPS 2006 Workshop on Learning to Compare Examples (pp. 1-6).

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-CF47-F Version Permalink: http://hdl.handle.net/21.11116/0000-0004-967F-5
Genre: Conference Paper

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 Creators:
Blaschko, MB1, 2, Author              
Hofmann, T, Author              
Affiliations:
1Department Empirical Inference, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497795              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: In the multiple instance learning setting, each observation is a bag of feature vectors of which one or more vectors indicates membership in a class. The primary task is to identify if any vectors in the bag indicate class membership while ignoring vectors that do not. We describe here a kernel-based technique that defines a parametric family of kernels via conformal transformations and jointly learns a discriminant function over bags together with the optimal parameter settings of the kernel. Learning a conformal transformation effectively amounts to weighting regions in the feature space according to their contribution to classification accuracy; regions that are discriminative will be weighted higher than regions that are not. This allows the classifier to focus on regions contributing to classification accuracy while ignoring regions that correspond to vectors found both in positive and in negative bags. We show how parameters of this transformation can be learned for support vector machines by posing the problem as a multiple kernel learning problem. The resulting multiple instance classifier gives competitive accuracy for several multi-instance benchmark datasets from different domains.

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 Dates: 2006-12
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: 4250
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Title: NIPS 2006 Workshop on Learning to Compare Examples
Place of Event: Whistler, BC, Canada
Start-/End Date: 2006-12-08

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Title: NIPS 2006 Workshop on Learning to Compare Examples
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 6 Identifier: -