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arXiv 2006.09074cs.ITmath.IT
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定量成组检验与随机矩阵的秩

Quantitative Group Testing and the rank of random matrices

Uriel Feige, Amir Lellouche

摘要:

给定随机伯努利矩阵$ A\in \{0,1\}^{m\times n} $、整数$ 0< k < n $和向量$ y:=Ax $,其中$ x \in \{0,1\}^n $具有汉明重量$ k $,{ \em定量分组测试}(QGT)问题的目标是恢复$ x $。PDMATHAMT越小,这个问题就越困难。对于我们感兴趣的参数范围,已知的多项式时间算法需要比$k$大得多的$m$值。在这项工作中,我们定义了一个看似简单的问题,我们称之为{ \em子集选择}。给定与QGT中相同的输入,子集选择中的目标是返回基数$ m $的子集$ S \subseteq [n] $,使得对于所有$ i\in [n] $,如果是$ x_i = 1 $,则是$ i\in S $。我们表明,如果由$S$索引的列定义的$A$的平方子矩阵具有近满秩,那么从子集选择问题的解决方案,我们可以恢复在多项式时间的解决方案$x$的QGT问题。我们猜想,对于每个多项式时间子集选择算法,得到的输出矩阵将满足所需的秩条件。我们证明了一些类的算法的猜想。使用这种减少,我们提供了一些例子,如何改善已知的QGT算法。使用理论分析和模拟,我们证明了修改后的算法解决QGT问题的$ m $值小于原来的算法所需的。

英文摘要:

Given a random Bernoulli matrix $ A\in \{0,1\}^{m\times n} $, an integer $ 0< k < n $ and the vector $ y:=Ax $, where $ x \in \{0,1\}^n $ is of Hamming weight $ k $, the objective in the {\em Quantitative Group Testing} (QGT) problem is to recover $ x $. This problem is more difficult the smaller $m$ is. For parameter ranges of interest to us, known polynomial time algorithms require values of $m$ that are much larger than $k$. In this work, we define a seemingly easier problem that we refer to as {\em Subset Select}. Given the same input as in QGT, the objective in Subset Select is to return a subset $ S \subseteq [n] $ of cardinality $ m $, such that for all $ i\in [n] $, if $ x_i = 1 $ then $ i\in S $. We show that if the square submatrix of $A$ defined by the columns indexed by $S$ has nearly full rank, then from the solution of the Subset Select problem we can recover in polynomial-time the solution $x$ to the QGT problem. We conjecture that for every polynomial time Subset Select algorithm, the resulting output matrix will satisfy the desired rank condition. We prove the conjecture for some classes of algorithms. Using this reduction, we provide some examples of how to improve known QGT algorithms. Using theoretical analysis and simulations, we demonstrate that the modified algorithms solve the QGT problem for values of $ m $ that are smaller than those required for the original algorithms.

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