Linear Size Sparsifier and the Geometry of the Operator Norm Ball
Linear Size Sparsifier and the Geometry of the Operator Norm Ball
复制标题
线性尺寸稀疏器和算子规范球的几何形状
DOI:
10.1137/1.9781611975994.143
复制
发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Rothvoss, Thomas
中科院分区:
文献类型:
--
作者:
Reis, Victor;Rothvoss, Thomas
The Matrix Spencer Conjecture asks whether givensymmetric matrices inwith eigenvalues inone can always find signs so that their signed sum has singular values bounded by. The standard approach in discrepancy requires proving that the convex body of all good fractional signings is large enough. However, this question has remained wide open due to the lack of tools to certify measure lower bounds for rather small non-polyhedral convex sets. A seminal result by Batson, Spielman and Srivastava from 2008 shows that any undirected graph admits a linear size spectral sparsifier. Again, one can define a convex body of all good fractional signings. We can indeed prove that this body is close to most of the Gaussian measure. This implies that a discrepancy algorithm by the second author can be used to sample a linear size sparsifer. In contrast to previous methods, we require only a logarithmic number of sampling phases.
登录
查看更多内容
DOI:
10.1137/141000282
发表时间:
2014
期刊:
2014 IEEE 55th Annual Symposium on Foundations of Computer Science
影响因子:
--
作者:
T. Rothvoss
通讯作者:
T. Rothvoss
影响因子:
1.6
作者:
Lovett, Shachar;Meka, Raghu
通讯作者:
Meka, Raghu
影响因子:
1
作者:
Ronen Eldan;Mohit Singh
通讯作者:
Mohit Singh
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
T. Tkocz
通讯作者:
T. Tkocz
影响因子:
0.8
作者:
A. Giannopoulos
通讯作者:
A. Giannopoulos