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arXiv 2101.02405cs.SIstat.ME
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具有社团结构网络的自适应群测试:随机块模型

Adaptive Group Testing on Networks with Community Structure: The Stochastic Block Model

Surin Ahn, Wei-Ning Chen, Ayfer Ozgur

摘要:

团体测试是在第二次世界大战期间构想出来的,目的是使用尽可能少的测试来识别感染梅毒的士兵,在COVID-19大流行期间,它再次引起了人们的兴趣。在群体测试问题的概率变体中,一个长期存在的假设是个体独立地被疾病感染。然而,这种假设在实践中很少成立,因为疾病往往通过个体之间的相互作用传播,因此导致感染相关。受COVID-19和其他传染病特点的启发,我们引入了一个网络上的感染模型,该模型推广了传统的i.i.d.概率分组测试模型。在此模型下,我们问是否可以利用网络结构的知识来更有效地执行组测试,特别是从随机块模型绘制的社区结构图。我们证明了一个简单的社区意识算法优于基线二进制分裂算法的模型参数时,有利于“强社区结构。“此外,我们的新下界意味着社区感知算法在某些参数制度下是最优的。我们扩展我们的界限的噪声设置,并支持我们的结果与数值实验。

英文摘要:

Group testing was conceived during World War II to identify soldiers infected with syphilis using as few tests as possible, and it has attracted renewed interest during the COVID-19 pandemic. A long-standing assumption in the probabilistic variant of the group testing problem is that individuals are infected by the disease independently. However, this assumption rarely holds in practice, as diseases often spread through interactions between individuals and therefore cause infections to be correlated. Inspired by characteristics of COVID-19 and other infectious diseases, we introduce an infection model over networks which generalizes the traditional i.i.d. model from probabilistic group testing. Under this model, we ask whether knowledge of the network structure can be leveraged to perform group testing more efficiently, focusing specifically on community-structured graphs drawn from the stochastic block model. We prove that a simple community-aware algorithm outperforms the baseline binary splitting algorithm when the model parameters are conducive to "strong community structure." Moreover, our novel lower bounds imply that the community-aware algorithm is order-optimal in certain parameter regimes. We extend our bounds to the noisy setting and support our results with numerical experiments.

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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