Low‐rank updates of matrix square roots
Low‐rank updates of matrix square roots
复制标题
矩阵平方根的低阶更新
DOI:
10.1002/nla.2528
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发表时间:
2023
影响因子:
4.3
通讯作者:
Avron, Haim
中科院分区:
文献类型:
--
作者:
Shmueli, Shany;Drineas, Petros;Avron, Haim
Models in which the covariance matrix has the structure of a sparse matrix plus a low rank perturbation are ubiquitous in data science applications. It is often desirable for algorithms to take advantage of such structures, avoiding costly matrix computations that often require cubic time and quadratic storage. This is often accomplished by performing operations that maintain such structures, for example, matrix inversion via the Sherman–Morrison–Woodbury formula. In this article, we consider the matrix square root and inverse square root operations. Given a low rank perturbation to a matrix, we argue that a low‐rank approximate correction to the (inverse) square root exists. We do so by establishing a geometric decay bound on the true correction's eigenvalues. We then proceed to frame the correction as the solution of an algebraic Riccati equation, and discuss how a low‐rank solution to that equation can be computed. We analyze the approximation error incurred when approximately solving the algebraic Riccati equation, providing spectral and Frobenius norm forward and backward error bounds. Finally, we describe several applications of our algorithms, and demonstrate their utility in numerical experiments.
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影响因子:
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作者:
B. Beckermann;Alice Cortinovis;D. Kressner;M. Schweitzer
通讯作者:
M. Schweitzer
DOI:
--
发表时间:
2013
期刊:
影响因子:
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Bamdev Mishra;Bart Vandereycken
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Bart Vandereycken
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M. Fasi;N. Higham;Xiaobo Liu
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Xiaobo Liu
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1.5
作者:
B. Beckermann;D. Kressner;M. Schweitzer
通讯作者:
M. Schweitzer
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1.5
作者:
D. Bernstein;C. Loan
通讯作者:
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