Ultrasparse Ultrasparsifiers and Faster Laplacian System Solvers
Ultrasparse Ultrasparsifiers and Faster Laplacian System Solvers
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超稀疏超稀疏器和更快的拉普拉斯系统求解器
DOI:
10.1137/1.9781611976465.33
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Sidford, Aaron
中科院分区:
文献类型:
--
作者:
Jambulapati, Arun;Sidford, Aaron
In this paper we provide anO(mloglogO(1)nlog (1/ϵ))-expected time algorithm for solving Laplacian systems onn-nodem-edge graphs, improving upon the previous best expected runtime of \(O(m \sqrt {\log n} \mathrm{log log}^{O(1)} n \log (1/\epsilon)) \) achieved by (Cohen, Kyng, Miller, Pachocki, Peng, Rao, Xu 2014). To obtain this result we provide efficient constructions of low spectral stretch graph approximations with improved stretch and sparsity bounds. As motivation for this work, we show that for every set of vectors in \(\mathbb {R}^d \) (not just those induced by graphs) and all integerk> 1 there exist an ultra-sparsifier withd− 1 +O(d/k) re-weighted vectors of relative condition number at mostk2. For smallk, this improves upon the previous best known multiplicative factor of \(k \cdot \tilde{O}(\log d) \) , which is only known for the graph case. Additionally, in the graph case we employ our low-stretch subgraph construction to obtainn− 1 +O(n/k)-edge ultrasparsifiers of relative condition numberk1 +o(1)fork=ω(logδn) for anyδ> 0: this improves upon the previous work fork=o(exp (log1/2 −δn)).
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DOI:
--
发表时间:
2019
期刊:
Symposium on the Theory of Computing
影响因子:
--
作者:
Jason Li
通讯作者:
Jason Li
DOI:
--
发表时间:
2018
期刊:
ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing
影响因子:
--
作者:
Gregory Bodwin;Shyamal Patel
通讯作者:
Shyamal Patel
DOI:
10.1090/dimacs/007/01
发表时间:
1991
期刊:
--
影响因子:
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作者:
N. Alon;R. Karp;D. Peleg;D. West
通讯作者:
N. Alon;R. Karp;D. Peleg;D. West
DOI:
10.1007/978-3-642-25873-2_11
发表时间:
2011
期刊:
ArXiv
影响因子:
--
作者:
C. Gavoille;Quentin Godfroy;L. Viennot
通讯作者:
L. Viennot
DOI:
--
发表时间:
2019-06
期刊:
ArXiv
影响因子:
--
作者:
Oliver Hinder;Aaron Sidford;N. Sohoni
通讯作者:
Oliver Hinder;Aaron Sidford;N. Sohoni