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arXiv 1209.0841cs.CVcs.MM
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构造用于鲁棒子空间学习和子空间聚类的L2-Graph

Constructing the L2-Graph for Robust Subspace Learning and Subspace Clustering

Institute for Infocomm Research, Agency for Science, Technology and Research (A*STAR)(资讯通信研究院,科技研究局(A*STAR));Carnegie Mellon University(卡内基梅隆大学);Sichuan University(四川大学)

Xi Peng, Zhiding Yu, Huajin Tang, Zhang Yi

摘要:

在基于图的学习的框架下,鲁棒的子空间聚类和子空间学习的关键是获得良好的相似性图,该相似性图消除了错误的影响并且仅保留来自同一子空间的数据点之间的连接(即,子空间内数据点)。最近的作品取得了良好的性能建模误差到他们的目标函数,以消除输入的错误。然而,这些方法面临的局限性,错误的结构,必须事先知道,必须解决一个复杂的凸问题。在本文中,我们提出了一种新的方法来消除的影响,从投影空间(表示),而不是从输入空间的错误。我们首先证明了$\ell_1$ -、$\ell_2$ -、$\ell_{\infty}$ -和基于核范数的线性投影空间共享子空间内投影优势(IPD)的性质,即,子空间内数据点上的系数大于子空间间数据点上的系数。基于这一性质,我们提出了一种构造稀疏相似图的方法,称为L2-Graph。在L2-Graph的基础上,提出了子空间聚类和子空间学习算法。实验表明,L2-Graph算法在准确性、鲁棒性和时间效率方面优于用于特征提取、图像聚类和运动分割的最新方法。

英文摘要:

Under the framework of graph-based learning, the key to robust subspace clustering and subspace learning is to obtain a good similarity graph that eliminates the effects of errors and retains only connections between the data points from the same subspace (i.e., intra-subspace data points). Recent works achieve good performance by modeling errors into their objective functions to remove the errors from the inputs. However, these approaches face the limitations that the structure of errors should be known prior and a complex convex problem must be solved. In this paper, we present a novel method to eliminate the effects of the errors from the projection space (representation) rather than from the input space. We first prove that $\ell_1$-, $\ell_2$-, $\ell_{\infty}$-, and nuclear-norm based linear projection spaces share the property of Intra-subspace Projection Dominance (IPD), i.e., the coefficients over intra-subspace data points are larger than those over inter-subspace data points. Based on this property, we introduce a method to construct a sparse similarity graph, called L2-Graph. The subspace clustering and subspace learning algorithms are developed upon L2-Graph. Experiments show that L2-Graph algorithms outperform the state-of-the-art methods for feature extraction, image clustering, and motion segmentation in terms of accuracy, robustness, and time efficiency.

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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