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arXiv 1206.6476cs.LGcs.AIstat.ML
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可证明精确稀疏线性分类的相似性学习

Similarity Learning for Provably Accurate Sparse Linear Classification

Laboratoire Hubert Curien UMR CNRS 5516(于贝尔·居里安实验室(法国国家科学研究中心 UMR 5516))

Aurelien Bellet, Amaury Habrard, Marc Sebban

摘要:

近年来,度量在机器学习算法中的至关重要性导致了对优化距离和相似性函数的兴趣越来越大。大多数现有技术集中在学习Mahalanobis距离(需要满足半正定性的约束),用于局部k-NN算法。然而,没有理论上的联系之间建立学习的指标和它们的分类性能。本文利用Balcan等人提出的良好相似性的形式化框架,设计了一种在非线性特征空间中学习非PSD线性相似性的算法,并利用该算法构建全局线性分类器。我们表明,我们的方法具有一致的稳定性,并推导出一个泛化的分类误差界。在各种数据集上进行的实验证实了我们的方法与最先进的方法相比的有效性,并提供证据证明:(i)它是快速的,(ii)对过拟合具有鲁棒性,(iii)产生非常稀疏的分类器。

英文摘要:

In recent years, the crucial importance of metrics in machine learning algorithms has led to an increasing interest for optimizing distance and similarity functions. Most of the state of the art focus on learning Mahalanobis distances (requiring to fulfill a constraint of positive semi-definiteness) for use in a local k-NN algorithm. However, no theoretical link is established between the learned metrics and their performance in classification. In this paper, we make use of the formal framework of good similarities introduced by Balcan et al. to design an algorithm for learning a non PSD linear similarity optimized in a nonlinear feature space, which is then used to build a global linear classifier. We show that our approach has uniform stability and derive a generalization bound on the classification error. Experiments performed on various datasets confirm the effectiveness of our approach compared to state-of-the-art methods and provide evidence that (i) it is fast, (ii) robust to overfitting and (iii) produces very sparse classifiers.

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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