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arXiv 1707.05587cs.LGcs.SIstat.ML
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稀疏先验下的图学习

Graph learning under sparsity priors

EPFL(洛桑联邦理工学院)

Hermina Petric Maretic, Dorina Thanou, Pascal Frossard

摘要:

图形信号为网络或不规则结构上的数据提供了非常通用和自然的表示。然而,实际的数据结构通常是先验未知的,但是有时可以根据应用领域的知识来估计。如果这是不可能的,则数据结构必须仅从信号观测推断。这正是我们在本文中解决的问题,假设图信号可以表示为结构化图字典的几个原子的稀疏线性组合。该字典构造在图拉普拉斯算子的多项式上,它可以稀疏地表示由图上的局部模式组成的一般类图信号。我们制定了一个图学习问题,其解决方案提供了一个理想的信号观测和稀疏图信号模型之间的配合。由于问题是非凸的,我们建议通过信号稀疏编码和图形更新步骤之间的交替来解决它。我们提供的实验结果,概述了良好的图形恢复性能,我们的方法,一般比较有利的其他最近的网络推理算法。

英文摘要:

Graph signals offer a very generic and natural representation for data that lives on networks or irregular structures. The actual data structure is however often unknown a priori but can sometimes be estimated from the knowledge of the application domain. If this is not possible, the data structure has to be inferred from the mere signal observations. This is exactly the problem that we address in this paper, under the assumption that the graph signals can be represented as a sparse linear combination of a few atoms of a structured graph dictionary. The dictionary is constructed on polynomials of the graph Laplacian, which can sparsely represent a general class of graph signals composed of localized patterns on the graph. We formulate a graph learning problem, whose solution provides an ideal fit between the signal observations and the sparse graph signal model. As the problem is non-convex, we propose to solve it by alternating between a signal sparse coding and a graph update step. We provide experimental results that outline the good graph recovery performance of our method, which generally compares favourably to other recent network inference algorithms.

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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