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arXiv 1708.03429cs.ITcs.DSmath.IT
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近似最优稀疏群测试

Nearly Optimal Sparse Group Testing

Venkata Gandikota, Elena Grigorescu, Sidharth Jaggi, Samson Zhou

摘要:

分组测试是从一组$n$项目中汇集任意子集的过程,以便用最少的测试次数识别$d$缺陷项目的“小”子集。在“经典”非自适应组测试中,已知当$d$显著小于$n$时,$Θ(d\log(n))$测试是信息理论上必要的并且足以保证以高概率恢复。文献中满足此界限的组测试方案要求大多数项目进行$Ω(\log(n))$次测试,并且大多数测试包含$Ω(n/d)$项目。出于物理上的考虑,我们研究组测试模型,其中的测试程序被限制为“稀疏”。具体来说,我们考虑(单独)的情况下,(a)项目是不可分割的,因此可能会参与最多$γ\in o(\log(n))$测试;或(b)测试的大小限制池不超过$ρ\in o(n/d)$项目每个测试。对于这两种情况下,我们提供了信息理论的下限,以保证高概率恢复所需的测试数量。在这两种情况下,我们提供了随机结构(在$ε$ -错误和零错误重建保证下)和显式结构的设计与计算效率高的重建算法,需要一些测试,这些测试在$n, d, γ,$和$ρ$的某些制度中是最佳的常数或小多项式因子。$ρ$大小的测试场景中的随机设计/重建算法是通用的--与$d$的值无关,只要$ρ\in o(n/d)$。我们还研究了不可靠性/噪声对测试结果的影响。有关完整的摘要,请参阅全文PDF。

英文摘要:

Group testing is the process of pooling arbitrary subsets from a set of $n$ items so as to identify, with a minimal number of tests, a "small" subset of $d$ defective items. In "classical" non-adaptive group testing, it is known that when $d$ is substantially smaller than $n$, $Θ(d\log(n))$ tests are both information-theoretically necessary and sufficient to guarantee recovery with high probability. Group testing schemes in the literature meeting this bound require most items to be tested $Ω(\log(n))$ times, and most tests to incorporate $Ω(n/d)$ items. Motivated by physical considerations, we study group testing models in which the testing procedure is constrained to be "sparse". Specifically, we consider (separately) scenarios in which (a) items are finitely divisible and hence may participate in at most $γ\in o(\log(n))$ tests; or (b) tests are size-constrained to pool no more than $ρ\in o(n/d)$items per test. For both scenarios we provide information-theoretic lower bounds on the number of tests required to guarantee high probability recovery. In both scenarios we provide both randomized constructions (under both $ε$-error and zero-error reconstruction guarantees) and explicit constructions of designs with computationally efficient reconstruction algorithms that require a number of tests that are optimal up to constant or small polynomial factors in some regimes of $n, d, γ,$ and $ρ$. The randomized design/reconstruction algorithm in the $ρ$-sized test scenario is universal -- independent of the value of $d$, as long as $ρ\in o(n/d)$. We also investigate the effect of unreliability/noise in test outcomes. For the full abstract, please see the full text PDF.

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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