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arXiv 1503.00338cs.ITcond-mat.stat-mechmath.ITstat.ML
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稀疏PCA中的相变

Phase Transitions in Sparse PCA

Thibault Lesieur, Florent Krzakala, Lenka Zdeborova

摘要:

研究了稀疏主成分分析中非零元素个数较少但与数据维数同阶时的最优估计问题。我们采用近似消息传递(AMP)算法和它的状态演化来分析什么是信息理论上的最小均方误差和一个由AMP实现的限制,大尺寸。对于秩为1且非零点的密度足够大的特殊情况,Deshpande和Montanari [1]证明了AMP是渐近最优的。我们发现,无论是低密度和大秩的问题经历了一系列的相变,这表明存在的一个区域的参数估计是信息理论上是可能的,但AMP(大概每一个其他多项式算法)失败。对大秩极限的分析特别有指导意义。

英文摘要:

We study optimal estimation for sparse principal component analysis when the number of non-zero elements is small but on the same order as the dimension of the data. We employ approximate message passing (AMP) algorithm and its state evolution to analyze what is the information theoretically minimal mean-squared error and the one achieved by AMP in the limit of large sizes. For a special case of rank one and large enough density of non-zeros Deshpande and Montanari [1] proved that AMP is asymptotically optimal. We show that both for low density and for large rank the problem undergoes a series of phase transitions suggesting existence of a region of parameters where estimation is information theoretically possible, but AMP (and presumably every other polynomial algorithm) fails. The analysis of the large rank limit is particularly instructive.

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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