Faster Walsh-Hadamard and Discrete Fourier Transforms from Matrix Non-rigidity
Faster Walsh-Hadamard and Discrete Fourier Transforms from Matrix Non-rigidity
复制标题
来自矩阵非刚性的更快 Walsh-Hadamard 和离散傅立叶变换
DOI:
10.1145/3564246.3585188
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Rao, Kevin
中科院分区:
文献类型:
--
作者:
Alman, Josh;Rao, Kevin
We give algorithms with lower arithmetic operation counts for both the Walsh-Hadamard Transform (WHT) and the Discrete Fourier Transform (DFT) on inputs of power-of-2 sizeN.For the WHT, our new algorithm has an operation count of 23/24NlogN+O(N). To our knowledge, this gives the first improvement on theNlogNoperation count of the simple, folklore Fast Walsh-Hadamard Transform algorithm.For the DFT, our new FFT algorithm uses 15/4NlogN+O(N) real arithmetic operations. Our leading constant 15/4 = 3.75 improves on the leading constant of 5 from the Cooley-Tukey algorithm from 1965, leading constant 4 from the split-radix algorithm of Yavne from 1968, leading constant 34/9=3.7777 from a modification of the split-radix algorithm by Van Buskirk from 2004, and leading constant 3.76875 from a theoretically optimized version of Van Buskirk’s algorithm by Sergeev from 2017.Our new WHT algorithm takes advantage of a recent line of work on the non-rigidity of the WHT: we decompose the WHT matrix as the sum of a low-rank matrix and a sparse matrix, and then analyze the structures of these matrices to achieve a lower operation count. Our new DFT algorithm comes from a novel reduction, showing that parts of the previous best FFT algorithms can be replaced by calls to an algorithm for the WHT. Replacing the folklore WHT algorithm with our new improved algorithm leads to our improved FFT.
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DOI:
--
发表时间:
2020
期刊:
arXiv.org
影响因子:
--
作者:
C. Ramya
通讯作者:
C. Ramya
DOI:
--
发表时间:
2021
期刊:
Symposium on the Theory of Computing
影响因子:
--
作者:
Josh Alman
通讯作者:
Josh Alman
DOI:
10.1145/3055399.3055484
发表时间:
2016
期刊:
Proceedings of the 49th Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
--
作者:
Josh Alman;Richard Ryan Williams
通讯作者:
Richard Ryan Williams
影响因子:
1.2
作者:
I. Sergeev
通讯作者:
I. Sergeev
DOI:
--
发表时间:
2013
期刊:
Chicago journal of theoretical computer science
影响因子:
--
作者:
Nir Ailon
通讯作者:
Nir Ailon