Rank‐structured approximation of some Cauchy matrices with sublinear complexity
Rank‐structured approximation of some Cauchy matrices with sublinear complexity
复制标题
一些具有次线性复杂度的柯西矩阵的Rank-结构化近似
DOI:
10.1002/nla.2526
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发表时间:
2023
影响因子:
4.3
通讯作者:
Xia, Jianlin
中科院分区:
文献类型:
--
作者:
Lepilov, Mikhail;Xia, Jianlin
In this article, we consider the rank‐structured approximation of one important type of Cauchy matrix. This approximation plays a key role in some structured matrix methods such as stable and efficient direct solvers and other algorithms for Toeplitz matrices and certain kernel matrices. Previous rank‐structured approximations (specifically hierarchically semiseparable, or HSS, approximations) for such a matrix of size n$$ n $$ cost at least O(n)$$ O(n) $$ complexity. Here, we show how to construct an HSS approximation with sublinear (specifically, O(log3n)$$ O\left({\log}^3n\right) $$) complexity. The main ideas include extensive computation reuse and an analytical far‐field compression strategy. Low‐rank compression at each hierarchical level is restricted to just a single off‐diagonal block row, and a resulting basis matrix is then reused for other off‐diagonal block rows as well as off‐diagonal block columns. The relationships among the off‐diagonal blocks are rigorously analyzed. The far‐field compression uses an analytical proxy point method where we optimize the choice of some parameters so as to obtain accurate low‐rank approximations. Both the basis reuse ideas and the resulting analytical hierarchical compression scheme can be generalized to some other kernel matrices and are useful for accelerating relevant rank‐structured approximations (though not subsequent operations like matrix‐vector multiplications).
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影响因子:
2.1
作者:
S. Börm;J. Gördes
通讯作者:
J. Gördes
DOI:
10.4208/csiam-am.2021.nla.02
发表时间:
2021
期刊:
CSIAM Transactions on Applied Mathematics
影响因子:
--
作者:
Xia, Jianlin
通讯作者:
Xia, Jianlin
DOI:
10.1553/etna_vol54s581
发表时间:
2021
期刊:
ETNA - Electronic Transactions on Numerical Analysis
影响因子:
--
作者:
Difeng Cai;J. Xia
通讯作者:
Difeng Cai;J. Xia
DOI:
10.1109/ipdps47924.2020.00082
发表时间:
2020-05
期刊:
2020 IEEE International Parallel and Distributed Processing Symposium (IPDPS)
影响因子:
--
作者:
Lucas Erlandson;Difeng Cai;Yuanzhe Xi;Edmond Chow
通讯作者:
Lucas Erlandson;Difeng Cai;Yuanzhe Xi;Edmond Chow