Using Random Butterfly Transformations to Avoid Pivoting in Sparse Direct Methods
Using Random Butterfly Transformations to Avoid Pivoting in Sparse Direct Methods
复制标题
使用随机蝴蝶变换避免稀疏直接方法中的旋转
DOI:
10.1007/978-3-319-17353-5_12
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
François
中科院分区:
文献类型:
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作者:
M. Baboulin;X. Li;François
We consider the solution of sparse linear systems using direct methods via LU factorization. Unless the matrix is positive definite, numerical pivoting is usually needed to ensure stability, which is costly to implement especially in the sparse case. The Random Butterfly Transformations (RBT) technique provides an alternative to pivoting and is easily parallelizable. The RBT transforms the original matrix into another one that can be factorized without pivoting with probability one. This approach has been successful for dense matrices; in this work, we investigate the sparse case. In particular, we address the issue of fill-in in the transformed system.
影响因子:
2.1
作者:
通讯作者:
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