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arXiv 2002.09759math.NAcs.NA
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块项张量分解:模型选择与计算

Block-Term Tensor Decomposition: Model Selection and Computation

Athanasios A. Rontogiannis, Eleftherios Kofidis, Paris V. Giampouras

摘要:

所谓的块项分解(BTD)张量模型最近受到越来越多的关注,这是由于其增强的表示由秩高于1的\emph{blocks}组成的系统和信号的能力,这是在许多不同的应用中遇到的情况。因此,它的唯一性和近似性得到了深入的研究。然而,具有挑战性的问题,估计BTD模型的结构,即块项的数量和它们各自的排名,最近才开始引起人们的极大关注。本文提出了一种新的BTD模型选择和计算方法,该方法基于对因子以\emph{hierarchical}方式施加列稀疏度\emph{jointly},并将秩估计为不可忽略的因子列数。块连续上界最小化(BSUM)的方法所提出的最优化问题,导致交替分层迭代加权最小二乘(HIRLS)算法,这是快速收敛,并享有高计算效率,因为它依赖于在其迭代上的小尺寸的子问题的封闭形式的解决方案。合成的例子和高光谱图像去噪应用的仿真结果报告,这表明所提出的计划的优越性,在国家的最先进的秩估计的成功率以及计算时间和收敛速率。

英文摘要:

The so-called block-term decomposition (BTD) tensor model has been recently receiving increasing attention due to its enhanced ability of representing systems and signals that are composed of \emph{blocks} of rank higher than one, a scenario encountered in numerous and diverse applications. Its uniqueness and approximation have thus been thoroughly studied. Nevertheless, the challenging problem of estimating the BTD model structure, namely the number of block terms and their individual ranks, has only recently started to attract significant attention. In this paper, a novel method of BTD model selection and computation is proposed, based on the idea of imposing column sparsity \emph{jointly} on the factors and in a \emph{hierarchical} manner and estimating the ranks as the numbers of factor columns of non-negligible magnitude. Following a block successive upper bound minimization (BSUM) approach for the proposed optimization problem is shown to result in an alternating hierarchical iteratively reweighted least squares (HIRLS) algorithm, which is fast converging and enjoys high computational efficiency, as it relies in its iterations on small-sized sub-problems with closed-form solutions. Simulation results for both synthetic examples and a hyper-spectral image de-noising application are reported, which demonstrate the superiority of the proposed scheme over the state-of-the-art in terms of success rate in rank estimation as well as computation time and rate of convergence.

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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