arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.02883cs.DScs.GT
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在线随机匹配中多项选择的力量

The Power of Multiple Choices in Online Stochastic Matching

Zhiyi Huang, Xinkai Shu, Shuyi Yan

摘要:

我们研究了在线随机匹配中多项选择的能力。尽管有很长的研究路线,现有的算法仍然只考虑两个选择的离线邻居的每个在线顶点,因为在分析多个选择的技术挑战。本文介绍了两种方法来设计和分析算法,使用多个选择。对于未加权匹配和顶点加权匹配,我们将在线相关选择(OCS)技术引入到随机环境中,并将竞争比分别从$0.711$和$0.7$提高到$0.716$。对于边缘加权匹配的自由处理,我们提出了上半采样算法。通过微分不等式,我们直接描述了整个匹配过程,而不是单个顶点。这提高了与$0.706$的竞争比,在文献中首次打破了这种情况下的$1-\frac{1}{e}$障碍。最后,对于更难的边缘加权的问题,没有自由处置,我们证明,没有算法可以是$0.703$竞争,从上述三个分离设置。

英文摘要:

We study the power of multiple choices in online stochastic matching. Despite a long line of research, existing algorithms still only consider two choices of offline neighbors for each online vertex because of the technical challenge in analyzing multiple choices. This paper introduces two approaches for designing and analyzing algorithms that use multiple choices. For unweighted and vertex-weighted matching, we adopt the online correlated selection (OCS) technique into the stochastic setting, and improve the competitive ratios to $0.716$, from $0.711$ and $0.7$ respectively. For edge-weighted matching with free disposal, we propose the Top Half Sampling algorithm. We directly characterize the progress of the whole matching instead of individual vertices, through a differential inequality. This improves the competitive ratio to $0.706$, breaking the $1-\frac{1}{e}$ barrier in this setting for the first time in the literature. Finally, for the harder edge-weighted problem without free disposal, we prove that no algorithms can be $0.703$ competitive, separating this setting from the aforementioned three.

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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