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The 25th International Conference on Machine Learning (ICML 2008)

Localized Multiple Kernel Learning

author: Mehmet Gonën, Department of Computer Engineering, Bogazici University

Description

Recently, instead of selecting a single kernel, multiple kernel learning (MKL) has been proposed which uses a convex combination of kernels, where the weight of each kernel is optimized during training. However, MKL assigns the same weight to a kernel over the whole input space. In this paper, we develop a localized multiple kernel learning (LMKL) algorithm using a gating model for selecting the appropriate kernel function locally. The localizing gating model and the kernel-based classifier are coupled and their optimization is done in a joint manner. Empirical results on ten benchmark and two bioinformatics data sets validate the applicability of our approach. LMKL achieves statistically similar accuracy results compared with MKL by storing fewer support vectors. LMKL can also combine multiple copies of the same kernel function localized in different parts. For example, LMKL with multiple linear kernels gives better accuracy results than using a single linear kernel on bioinformatics data sets.

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Slides
0:00 Localized Multiple Kernel Learning
0:00 Outline
0:23 Introduction
1:13 Motivation - 1
2:23 Motivation - 2
3:33 - Questions
4:35 Kernel-Based Learning (Step 1) - 1
5:18 Kernel-Based Learning (Step 1) - 2
5:45 Gating Model Learning (Step 2)
6:49 Complete Algorithm
7:57 Discussions - 1
9:04 Discussions - 2
9:56 Experiments
10:23 Combining Linear and Polynomial Kernels
11:21 Combining Three Linear Kernels
11:58 Effect of Locality on Combined Kernel
12:34 Results on UCI Data Sets - 1
13:25 Results on UCI Data Sets - 2
14:00 Results on Bioinformatics Data Sets
14:45 Conclusions - 1
15:44 Conclusions - 2
16:41 - Questions
18:26 - Questions
18:41 - Questions
19:07 - Questions

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