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arXiv 0909.3508cs.ITcs.DMmath.IT
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具有概率测量的压缩感知:一种组测试解决方案

Compressed Sensing with Probabilistic Measurements: A Group Testing Solution

Mahdi Cheraghchi, Ali Hormati, Amin Karbasi, Martin Vetterli

摘要:

在统计界,对大量人群中有缺陷的成员的检测被称为“群体检测”,这一问题可以追溯到第二次世界大战时,当时建议进行梅毒筛查。在那里,主要的兴趣是使用集体样本在大量人口中确定少数感染者。在病毒性流行病中,获取集体样本的一种方法是向人群中派遣代理人。而在经典的组测试,它是假设采样过程是完全已知的重建算法,在这项工作中,我们假设解码器只拥有部分知识的采样过程。这一假设是合理的,因为观察到在病毒性疾病中,尽管与感染者接触,但有可能使代理人保持健康。因此,重建方法必须处理两种不同类型的不确定性,即,感染人群的识别和部分未知的抽样程序。在这项工作中,通过使用一个自然的概率模型的“病毒感染”,我们设计的非自适应抽样程序,允许成功识别的感染人口压倒性的概率1-o(1)。我们提出了概率和明确的设计程序,需要一个“小”数量的代理挑出受感染的个人。更准确地说,对于污染概率p,识别最多k个感染成员的概率设计和显式设计所需的代理数量分别为m = O(k^2(log n)^2/p^2)和m = O(k^2(log n)^2 /p^2)。在这两种情况下,一个简单的解码器能够在O(mn)的时间内成功地识别出被感染的种群。

英文摘要:

Detection of defective members of large populations has been widely studied in the statistics community under the name "group testing", a problem which dates back to World War II when it was suggested for syphilis screening. There the main interest is to identify a small number of infected people among a large population using collective samples. In viral epidemics, one way to acquire collective samples is by sending agents inside the population. While in classical group testing, it is assumed that the sampling procedure is fully known to the reconstruction algorithm, in this work we assume that the decoder possesses only partial knowledge about the sampling process. This assumption is justified by observing the fact that in a viral sickness, there is a chance that an agent remains healthy despite having contact with an infected person. Therefore, the reconstruction method has to cope with two different types of uncertainty; namely, identification of the infected population and the partially unknown sampling procedure. In this work, by using a natural probabilistic model for "viral infections", we design non-adaptive sampling procedures that allow successful identification of the infected population with overwhelming probability 1-o(1). We propose both probabilistic and explicit design procedures that require a "small" number of agents to single out the infected individuals. More precisely, for a contamination probability p, the number of agents required by the probabilistic and explicit designs for identification of up to k infected members is bounded by m = O(k^2 (log n)/p^2) and m = O(k^2 (log n)^2 /p^2), respectively. In both cases, a simple decoder is able to successfully identify the infected population in time O(mn).

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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