A kernel-independent FMM in general dimensions
A kernel-independent FMM in general dimensions
复制标题
通用维度中与内核无关的 FMM
DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
G. Biros
中科院分区:
文献类型:
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作者:
William B. March;Bo Xiao;Sameer Tharakan;Chenhan D. Yu;G. Biros
We introduce a general-dimensional, kernel-independent, algebraic fast multipole method and apply it to kernel regression. The motivation for this work is the approximation of kernel matrices, which appear in mathematical physics, approximation theory, non-parametric statistics, and machine learning. Existing fast multipole methods are asymptotically optimal, but the underlying constants scale quite badly with the ambient space dimension. We introduce a method that mitigates this shortcoming; it only requires kernel evaluations and scales well with the problem size, the number of processors, and the ambient dimension---as long as the intrinsic dimension of the dataset is small. We test the performance of our method on several synthetic datasets. As a highlight, our largest run was on an image dataset with 10 million points in 246 dimensions.