论文标题

多类和多标签支持向量机的统一框架

A Unified Framework for Multiclass and Multilabel Support Vector Machines

论文作者

Shajari, Hoda, Rangarajan, Anand

论文摘要

我们为多类和多标签支持向量机(SVM)提出了一种新颖的集成配方。已经提出了许多方法将原始的二进制SVM扩展到多一体的多类SVM。但是,尚未广泛研究其直接扩展到统一的多标签SVM。我们提出直接向SVM扩展,以应对统一框架内的多类和多标签分类问题。我们的框架偏离了传统的软边距SVM框架,其直接对立结构。在我们的表述中,特定于类的权重向量(正常向量)是通过最大程度地提高其来源的边缘和惩罚模式在离该来源太近的情况下来学习的。结果,每个权重矢量选择了相对于此起源的方向和幅度,以使其最能代表其相应类别的模式。通过最小化重量向量的成对内部产物,将类之间的对立引入了制剂中。我们还扩展了框架,以应对通过标准再现Hilbert Spaces(RKHS)的标准再现的非线性可分离性。与起源密切相关的偏见需要在原始特征空间和希尔伯特空间中正确处理。我们可以灵活地将约束纳入公式(如果它们更好地反映潜在的几何形状)并改善分类器的性能。为此,解决了诸如RKH中的原点之类的细节和技术。结果证明了多类和多标签分类问题的竞争性分类器。

We propose a novel integrated formulation for multiclass and multilabel support vector machines (SVMs). A number of approaches have been proposed to extend the original binary SVM to an all-in-one multiclass SVM. However, its direct extension to a unified multilabel SVM has not been widely investigated. We propose a straightforward extension to the SVM to cope with multiclass and multilabel classification problems within a unified framework. Our framework deviates from the conventional soft margin SVM framework with its direct oppositional structure. In our formulation, class-specific weight vectors (normal vectors) are learned by maximizing their margin with respect to an origin and penalizing patterns when they get too close to this origin. As a result, each weight vector chooses an orientation and a magnitude with respect to this origin in such a way that it best represents the patterns belonging to its corresponding class. Opposition between classes is introduced into the formulation via the minimization of pairwise inner products of weight vectors. We also extend our framework to cope with nonlinear separability via standard reproducing kernel Hilbert spaces (RKHS). Biases which are closely related to the origin need to be treated properly in both the original feature space and Hilbert space. We have the flexibility to incorporate constraints into the formulation (if they better reflect the underlying geometry) and improve the performance of the classifier. To this end, specifics and technicalities such as the origin in RKHS are addressed. Results demonstrates a competitive classifier for both multiclass and multilabel classification problems.

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