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arXiv 1208.3422stat.MLcs.LG
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核机器的距离度量学习

Distance Metric Learning for Kernel Machines

Washington University in St. Louis(圣路易斯华盛顿大学);Criteo(科韬)

Zhixiang Xu, Kilian Q. Weinberger, Olivier Chapelle

摘要:

最近在度量学习方面的工作显着提高了k-最近邻分类的最新水平。支持向量机(SVM),特别是具有RBF核的SVM,是使用距离度量来比较示例的最流行的分类算法之一。本文对三种最流行的马氏度量学习算法作为SVM训练的预处理的有效性进行了实证分析。我们发现,这些算法都没有产生指标,导致特别令人满意的改进SVM-RBF分类。作为一种补救措施,我们引入支持向量度量学习(SVML),一种新的算法,无缝地结合了马氏度量的学习与RBF-SVM参数的训练。我们证明了SVML的能力,在九个基准数据集的不同大小和难度。在我们的研究中,SVML在准确性方面优于所有其他最先进的度量学习算法,并通过交叉验证建立了自己作为标准欧几里得度量的模型选择的严肃替代品。

英文摘要:

Recent work in metric learning has significantly improved the state-of-the-art in k-nearest neighbor classification. Support vector machines (SVM), particularly with RBF kernels, are amongst the most popular classification algorithms that uses distance metrics to compare examples. This paper provides an empirical analysis of the efficacy of three of the most popular Mahalanobis metric learning algorithms as pre-processing for SVM training. We show that none of these algorithms generate metrics that lead to particularly satisfying improvements for SVM-RBF classification. As a remedy we introduce support vector metric learning (SVML), a novel algorithm that seamlessly combines the learning of a Mahalanobis metric with the training of the RBF-SVM parameters. We demonstrate the capabilities of SVML on nine benchmark data sets of varying sizes and difficulties. In our study, SVML outperforms all alternative state-of-the-art metric learning algorithms in terms of accuracy and establishes itself as a serious alternative to the standard Euclidean metric with model selection by cross validation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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