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:
SODA 2021
影响因子:
--
通讯作者:
Sidford, Aaron
Sidford, Aaron
中科院分区:
--
文献类型:
--
作者:
Jambulapati, Arun;Sidford, Aaron

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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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