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arXiv 1606.03802cs.LGstat.ML
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开集支持向量机

Open-Set Support Vector Machines

University of Campinas(坎皮纳斯大学);University of Colorado Colorado Springs(科罗拉多大学科罗拉多斯普林斯分校)

Pedro Ribeiro Mendes Júnior, Terrance E. Boult, Jacques Wainer, Anderson Rocha

摘要:

通常,在处理现实世界的识别问题时,我们不需要,也不可能拥有在操作测试期间可能出现的整个可能类集合的知识。在这种情况下,我们需要考虑能够处理“未知”的鲁棒分类方法,并适当地拒绝属于训练期间从未见过的类别的样本。尽管如此,迄今为止现有的分类器大多是为封闭集情景开发的,即,分类设置,其中假设所有测试样本属于训练分类器的类别之一。然而,在开集场景中,测试样本可以不属于任何已知类,并且分类器必须通过将其分类为未知来正确拒绝它。在这项工作中,我们扩展了著名的支持向量机(SVM)分类器,并介绍了开集支持向量机(OSSVM),这是适合于识别开集设置。OSSVM平衡了经验风险和未知风险,并确保测试样本被分类为已知(已知类别之一)的特征空间区域始终有界,从而确保未知风险有限。在这项工作中,我们还强调了与开集场景相关的SVM分类器的属性,并提供了RBF SVM具有有界开空间风险的充分必要条件。

英文摘要:

Often, when dealing with real-world recognition problems, we do not need, and often cannot have, knowledge of the entire set of possible classes that might appear during operational testing. In such cases, we need to think of robust classification methods able to deal with the "unknown" and properly reject samples belonging to classes never seen during training. Notwithstanding, existing classifiers to date were mostly developed for the closed-set scenario, i.e., the classification setup in which it is assumed that all test samples belong to one of the classes with which the classifier was trained. In the open-set scenario, however, a test sample can belong to none of the known classes and the classifier must properly reject it by classifying it as unknown. In this work, we extend upon the well-known Support Vector Machines (SVM) classifier and introduce the Open-Set Support Vector Machines (OSSVM), which is suitable for recognition in open-set setups. OSSVM balances the empirical risk and the risk of the unknown and ensures that the region of the feature space in which a test sample would be classified as known (one of the known classes) is always bounded, ensuring a finite risk of the unknown. In this work, we also highlight the properties of the SVM classifier related to the open-set scenario, and provide necessary and sufficient conditions for an RBF SVM to have bounded open-space risk.

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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