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arXiv 1608.04320cs.LGcs.ITmath.IT
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Correlated-PCA:数据与噪声相关时的主成分分析

Correlated-PCA: Principal Components' Analysis when Data and Noise are Correlated

Iowa State University(爱荷华州立大学)

Namrata Vaswani, Han Guo

摘要:

给定一个观测数据矩阵,主成分分析(PCA)计算包含其大部分变异性的少量正交方向。可以证明精确的PCA解决方案已经使用了很长时间。然而,据我们所知,所有现有的理论保证都假设数据和破坏性噪声是相互独立的,或者至少是不相关的。这在实践中经常有效,但并不总是有效。在本文中,我们研究的PCA问题中的数据和噪声可以相关的设置。这种噪声通常也被称为“数据相关噪声”。我们得到了一个正确的结果为标准的特征值分解(EVD)为基础的解决方案PCA在简单的假设下的数据噪声相关性。我们还开发和分析了EVD,集群EVD,提高EVD在某些制度的泛化。

英文摘要:

Given a matrix of observed data, Principal Components Analysis (PCA) computes a small number of orthogonal directions that contain most of its variability. Provably accurate solutions for PCA have been in use for a long time. However, to the best of our knowledge, all existing theoretical guarantees for it assume that the data and the corrupting noise are mutually independent, or at least uncorrelated. This is valid in practice often, but not always. In this paper, we study the PCA problem in the setting where the data and noise can be correlated. Such noise is often also referred to as "data-dependent noise". We obtain a correctness result for the standard eigenvalue decomposition (EVD) based solution to PCA under simple assumptions on the data-noise correlation. We also develop and analyze a generalization of EVD, cluster-EVD, that improves upon EVD in certain regimes.

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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