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arXiv 1702.02279cs.ITcs.DSmath.IT
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从池化数据解码:消息传递的相变

Decoding from Pooled Data: Phase Transitions of Message Passing

Ahmed El Alaoui, Aaditya Ramdas, Florent Krzakala, Lenka Zdeborova, Michael I. Jordan

摘要:

本文研究了从一个分类变量的离散信号的集合子集的几个直方图的观测值中解码该信号的问题,提出了一种近似消息传递(AMP)算法,用于在随机密集设置中恢复该信号,其中每个观测直方图包含一个与n成比例的条目的随机子集。我们的特点的算法的性能在渐近制度的观察$m$的数量趋于无穷大成比例的n,通过推导相应的状态演化(SE)方程和研究他们的动态。我们开始分析的多维SE动力学证明其收敛到一个固定点,以及一些进一步的性质的迭代。分析揭示了尖锐的相变现象,其中AMP的行为从精确恢复到与信号的弱相关,因为m/n超过阈值。我们推导出公式的阈值在某些特殊情况下,并表明它们准确地匹配实验行为。

英文摘要:

We consider the problem of decoding a discrete signal of categorical variables from the observation of several histograms of pooled subsets of it. We present an Approximate Message Passing (AMP) algorithm for recovering the signal in the random dense setting where each observed histogram involves a random subset of entries of size proportional to n. We characterize the performance of the algorithm in the asymptotic regime where the number of observations $m$ tends to infinity proportionally to n, by deriving the corresponding State Evolution (SE) equations and studying their dynamics. We initiate the analysis of the multi-dimensional SE dynamics by proving their convergence to a fixed point, along with some further properties of the iterates. The analysis reveals sharp phase transition phenomena where the behavior of AMP changes from exact recovery to weak correlation with the signal as m/n crosses a threshold. We derive formulae for the threshold in some special cases and show that they accurately match experimental behavior.

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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