Improved Local Computation Algorithm for Set Cover via Sparsification

Improved Local Computation Algorithm for Set Cover via Sparsification
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通过稀疏化改进集覆盖的局部计算算法

DOI:
10.1137/1.9781611975994.181
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发表时间:
2020
期刊:
ACM-SIAM Symposium on Discrete Algorithms (SODA 2020
影响因子:
--
通讯作者:
Vakilian, A.
Vakilian, A.
中科院分区:
--
文献类型:
--
作者:
Grunau, C.;Mitrovic, S.;Rubinfeld, R.;Vakilian, A.

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我们为集合覆盖问题设计了局部计算算法(LCA)。给定一个集合系统,其中每个集合的大小最多,并且每个元素最多包含在 t 个集合中,该算法报告给定集合是否在某个固定集合覆盖中,其预期大小为 O(logs) 乘以最小分数集合覆盖值。我们的算法需要sO(logs)tO(logs+log logt))查询。该结果改进了在 [Kuhn 等人,SODA’06] 的结果上应用 [Parnas 和 Ron,TCS’07] 的约简,导致查询复杂度为 (st)O(log s · logt)。为了获得此结果,我们设计了一种并行集覆盖算法,该算法允许使用 [Ghaffari 和 Uitto, SODA’19] 中引入的 asparsification 技术在 LCA 模型中对最大独立集进行有效模拟问题。并行算法以类似于 [Berger 等人,FOCS’89] 的 PRAM 算法的方式将集合的随机子集添加到解决方案中。然而,我们的算法的不同之处在于它从不撤销其决策,这导致自适应轮数较少。这需要一种可能具有独立意义的新颖的近似分析。
We design a Local Computation Algorithm (LCA) for the set cover problem. Given a set system where each set has size at mostsand each element is contained in at mosttsets, the algorithm reports whether a given set is in some fixed set cover whose expected size isO(logs) times the minimum fractional set cover value. Our algorithm requiressO(logs)tO(logs+log logt))queries. This result improves upon the application of the reduction of [Parnas and Ron, TCS’07] on the result of [Kuhn et al., SODA’06], which leads to a query complexity of (st)O(log s · logt).To obtain this result, we design a parallel set cover algorithm that admits an efficient simulation in the LCA model by using asparsificationtechnique introduced in [Ghaffari and Uitto, SODA’19] for the maximal independent set problem. The parallel algorithm adds a random subset of the sets to the solution in a style similar to the PRAM algorithm of [Berger et al., FOCS’89]. However, our algorithm differs in the way that it neverrevokesits decisions, which results in a fewer number of adaptive rounds. This requires a novel approximation analysis which might be of independent interest.
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