论文标题

在线随机最大重量匹配:顶点和边缘到达模型的先知不平等

Online Stochastic Max-Weight Matching: prophet inequality for vertex and edge arrival models

论文作者

Ezra, Tomer, Feldman, Michal, Gravin, Nick, Tang, Zhihao Gavin

论文摘要

我们为在线加权匹配(非两部分)图提供了先知不平等算法,在两个经过深入研究的到达模型下,即边缘到达和顶点到达。每个边缘的重量与A-Priori已知概率分布独立绘制。在边缘到达的情况下,到达时揭示了每个边缘的重量,并且该算法决定是否将其包括在匹配中。在顶点到达的情况下,揭示了从新到达顶点到所有先前到达的顶点的所有边缘的权重,并且该算法决定在匹配中包含哪些边缘(如果有的话)。为了研究这些环境,我们介绍了一个新颖的统一统一框架,这些框架的先知不平等框架捕获了零件零件到达的在线环境;特别是它捕获了上述两个到达模型下的匹配。我们的算法依赖于合适的在线争议解决方案(OCRS)的构建。我们首先将OCR的框架扩展到了批处理的OCT,然后我们从批处理的先知不等式到批处理的OCR建立了一个减少,最后我们构建了批处理的OCR,可选比率分别为Edge和Vertex Arrival模型为0.337和0.5。两种结果都改善了相应设置的艺术状态。对于顶点到达,我们的结果很紧。有趣的是,基于定价的先知不平等,具有可比竞争比率的不平等是未知的。

We provide prophet inequality algorithms for online weighted matching in general (non-bipartite) graphs, under two well-studied arrival models, namely edge arrival and vertex arrival. The weight of each edge is drawn independently from an a-priori known probability distribution. Under edge arrival, the weight of each edge is revealed upon arrival, and the algorithm decides whether to include it in the matching or not. Under vertex arrival, the weights of all edges from the newly arriving vertex to all previously arrived vertices are revealed, and the algorithm decides which of these edges, if any, to include in the matching. To study these settings, we introduce a novel unified framework of batched prophet inequalities that captures online settings where elements arrive in batches; in particular it captures matching under the two aforementioned arrival models. Our algorithms rely on the construction of suitable online contention resolution scheme (OCRS). We first extend the framework of OCRS to batched-OCRS, we then establish a reduction from batched prophet inequality to batched OCRS, and finally we construct batched OCRSs with selectable ratios of 0.337 and 0.5 for edge and vertex arrival models, respectively. Both results improve the state of the art for the corresponding settings. For the vertex arrival, our result is tight. Interestingly, a pricing-based prophet inequality with comparable competitive ratios is unknown.

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