LU Preconditioning for Overdetermined Sparse Least Squares Problems

LU Preconditioning for Overdetermined Sparse Least Squares Problems
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超定稀疏最小二乘问题的 LU 预处理

DOI:
10.1007/978-3-319-32149-3_13
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发表时间:
2015
期刊:
2015 15th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing
影响因子:
--
通讯作者:
M. Baboulin
M. Baboulin
中科院分区:
--
文献类型:
--
作者:
G. Howell;M. Baboulin

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我们研究如何使用LU分解与经典的lsqr例程解决超定稀疏最小二乘问题。通常L比A有更好的条件,用L代替A迭代会导致更快的收敛。当运行时测试表明L不是充分良好条件时,L的部分正交化加速收敛。数值实验表明,我们的算法在存储和收敛方面的良好行为。
We investigate how to use an LU factorization with the classical lsqr routine for solving overdetermined sparse least squares problems. Usually L is much better conditioned than A and iterating with L instead of A results in faster convergence. When a runtime test indicates that L is not sufficiently well-conditioned, a partial orthogonalization of L accelerates the convergence. Numerical experiments illustrate the good behavior of our algorithm in terms of storage and convergence.
DOI: 10.1137/1.9780898718003
发表时间: 2003-05
期刊: --
影响因子: --
作者:
Y. Saad
通讯作者: Y. Saad