arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1312.2173cs.DS
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无约束非单调子模极大化双边近视算法的界

Bounds on Double-Sided Myopic Algorithms for Unconstrained Non-monotone Submodular Maximization

Norman Huang, Allan Borodin

摘要:

无约束子模最大化捕获了许多NP难的组合优化问题,包括最大割、最大迪割和设施定位问题的变体。最近,Buchbinder等人提出了一种令人惊讶的简单线性时间随机化贪婪式在线算法,该算法实现了1/2的恒定近似比,最佳匹配Feige等人的硬度结果。受Buchbinder等人算法的启发,我们引入一种称为双侧近视算法的精确算法模型。我们表明,虽然Buchbinder等人的算法。可以实现为一个随机的在线双侧近视算法,没有这样的确定性算法,即使自适应排序,可以达到相同的近似比。关于最大-迪-切问题,我们与Buchbinder等人的算法和我们的近视框架的在线算法和inapproximation的Bar-Noy和Lampis。

英文摘要:

Unconstrained submodular maximization captures many NP-hard combinatorial optimization problems, including Max-Cut, Max-Di-Cut, and variants of facility location problems. Recently, Buchbinder et al. presented a surprisingly simple linear time randomized greedy-like online algorithm that achieves a constant approximation ratio of 1/2, matching optimally the hardness result of Feige et al.. Motivated by the algorithm of Buchbinder et al., we introduce a precise algorithmic model called double-sided myopic algorithms. We show that while the algorithm of Buchbinder et al. can be realized as a randomized online double-sided myopic algorithm, no such deterministic algorithm, even with adaptive ordering, can achieve the same approximation ratio. With respect to the Max-Di-Cut problem, we relate the Buchbinder et al. algorithm and our myopic framework to the online algorithm and inapproximation of Bar-Noy and Lampis.

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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