Treewidth Computation and Kernelization in the Parallel External Memory Model
Treewidth Computation and Kernelization in the Parallel External Memory Model
复制标题
并行外部存储器模型中的树宽计算和核化
DOI:
10.1007/978-3-662-44602-7_7
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Matthias Mnich
中科院分区:
文献类型:
--
作者:
Tobias Lieber;Matthias Mnich
We present a randomized algorithm which computes, for any fixedk, a tree decomposition of width at mostkof any input graph. We analyze it in the parallel external memory (PEM) model that measures efficiency by counting the number of cache misses on a multi-CPU private cache shared memory machine. Our algorithm has sorting complexity, which we prove to be optimal for a large parameter range.We use this algorithm as part of a PEM-efficient kernelization algorithm. Kernelization is a technique for preprocessing instances of sizenofNP-hard problems with a structural parameterκby compressing them efficiently to a kernel, an equivalent instance of size at mostg(κ). An optimal solution to the original instance can then be recovered efficiently from an optimal solution to the kernel. Our main results here is an adaption of the linear-time randomized protrusion replacement algorithm by Fomin et al. (FOCS 2012). In particular, we obtain efficient randomized parallel algorithms to compute linear kernels in the PEM model for all separable contraction-bidimensional problems with finite integer index (FII) on apex minor-free graphs, and for all treewidth-bounding graph problems with FII on topological minor-free graphs.
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期刊:
Journal of computer and system sciences (Print)
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1993
期刊:
J. Algorithms
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