arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.04280math.NAcs.NA
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基于稀疏投影的随机LU分解

Randomized LU Decomposition Using Sparse Projections

Yariv Aizenbud, Gil Shabat, Amir Averbuch

摘要:

提出了一种低秩LU分解的快速近似算法。为了达到较低的复杂度,该算法使用稀疏随机投影结合基于FFT的随机投影。分析了算法的渐近逼近误差,给出了算法的理论误差界。最后,数值例子表明,对于类似的近似误差,稀疏LU算法是更快的比最近的国家的最先进的方法。该算法是完全可并行的,可以在GPU上运行。在GPU卡上测试了性能,与顺序执行相比,运行时间有了显着改善。

英文摘要:

A fast algorithm for the approximation of a low rank LU decomposition is presented. In order to achieve a low complexity, the algorithm uses sparse random projections combined with FFT-based random projections. The asymptotic approximation error of the algorithm is analyzed and a theoretical error bound is presented. Finally, numerical examples illustrate that for a similar approximation error, the sparse LU algorithm is faster than recent state-of-the-art methods. The algorithm is completely parallelizable that enables to run on a GPU. The performance is tested on a GPU card, showing a significant improvement in the running time in comparison to sequential execution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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