Online-batch strongly convex multi kernel learning

Francesco Orabona, Luo Jie, Barbara Caputo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

55 Scopus citations


Several object categorization algorithms use kernel methods over multiple cues, as they offer a principled approach to combine multiple cues, and to obtain state-of-theart performance. A general drawback of these strategies is the high computational cost during training, that prevents their application to large-scale problems. They also do not provide theoretical guarantees on their convergence rate. Here we present a Multiclass Multi Kernel Learning (MKL) algorithm that obtains state-of-the-art performance in a considerably lower training time. We generalize the standard MKL formulation to introduce a parameter that allows us to decide the level of sparsity of the solution. Thanks to this new setting, we can directly solve the problem in the primal formulation. We prove theoretically and experimentally that 1) our algorithm has a faster convergence rate as the number of kernels grow; 2) the training complexity is linear in the number of training examples; 3) very few iterations are enough to reach good solutions. Experiments on three standard benchmark databases support our claims. ©2010 IEEE.
Original languageEnglish (US)
Title of host publicationProceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition
Number of pages8
StatePublished - Aug 31 2010
Externally publishedYes


Dive into the research topics of 'Online-batch strongly convex multi kernel learning'. Together they form a unique fingerprint.

Cite this