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arXiv 2001.02774math.NAcs.NA
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CUR分解的抽样稳定性

Stability of Sampling for CUR Decompositions

Keaton Hamm, Longxiu Huang

摘要:

本文研究了如何通过主要的随机抽样形成低秩矩阵的CUR分解,尽管由于以前的工作也说明了确定性方法。主要问题是确定秩$k$矩阵的列子矩阵何时也具有秩$k$。对于随机列采样方案,通常在需要选择的列的数量和确定采样概率的复杂性之间存在折衷。我们讨论了几种抽样方法和它们的复杂性,以及在概率和基础矩阵扰动下的方法的稳定性。作为应用,我们给出了一个高概率的保证精确解的子空间聚类问题,通过CUR分解时,根据其欧几里德长度采样列。

英文摘要:

This article studies how to form CUR decompositions of low-rank matrices via primarily random sampling, though deterministic methods due to previous works are illustrated as well. The primary problem is to determine when a column submatrix of a rank $k$ matrix also has rank $k$. For random column sampling schemes, there is typically a tradeoff between the number of columns needed to be chosen and the complexity of determining the sampling probabilities. We discuss several sampling methods and their complexities as well as stability of the method under perturbations of both the probabilities and the underlying matrix. As an application, we give a high probability guarantee of the exact solution of the Subspace Clustering Problem via CUR decompositions when columns are sampled according to their Euclidean lengths.

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