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arXiv 1609.07518eess.SYcs.SY
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QUARKS: 大规模Kronecker向量自回归模型的识别

QUARKS: Identification of large-scale Kronecker Vector-AutoRegressive models

Delft Center for Systems and Control, Technische Universiteit Delft(代尔夫特系统与控制中心,代尔夫特理工大学)

Baptiste Sinquin, Michel Verhaegen

AI总结:

本文提出了一种基于Kronecker的建模方法,用于识别大规模传感器阵列的空间-时间动态。通过将系数矩阵分解为Kronecker积之和,该方法在二维N×N阵列中,当求和项数远小于N时,能实现高效的数据压缩。提出的交替最小二乘算法将参数估计复杂度从O(N^6)降低到O(N^3N_t),并且能够方便地整合更多结构(如稀疏、带状、Toeplitz)到因子矩阵中。

摘要:

在本文中,我们提出了一种基于Kronecker的建模方法,用于识别大规模传感器阵列的空间-时间动态。Kronecker网络的类别被定义为一种向量自回归模型,其系数矩阵被分解为Kronecker积之和。对于大小为N×N的二维阵列,当求和项数远小于N时,利用Kronecker结构可以实现高效的数据压缩。我们提出了一种交替最小二乘算法来识别系数矩阵,其复杂度为O(N^3N_t),其中N_t是时间样本的数量,而不是无结构情况下的O(N^6)。此外,该框架还允许方便地整合更多结构(例如稀疏、带状、Toeplitz)到因子矩阵中。在大气湍流数据上的数值实验表明,与无结构最小二乘估计相比,该方法在参数数量增长方面具有线性增长而非二次增长的优势。

英文摘要:

In this paper we propose a Kronecker-based modeling for identifying the spatial-temporal dynamics of large sensor arrays. The class of Kronecker networks is defined for which we formulate a Vector Autoregressive model. Its coefficient-matrices are decomposed into a sum of Kronecker products. For a two-dimensional array of size $N \times N$, and when the number of terms in the sum is small compared to $N$, exploiting the Kronecker structure leads to high data compression. We propose an Alternating Least Squares algorithm to identify the coefficient matrices with $\mathcal{O}(N^3N_t)$, where $N_t$ is the number of temporal samples, instead of $\mathcal{O}(N^6)$ in the unstructured case. This framework moreover allows for a convenient integration of more structure (e.g sparse, banded, Toeplitz) on the factor matrices. Numerical examples on atmospheric turbulence data has shown comparable performances with the unstructured least-squares estimation while the number of parameters is growing only linearly w.r.t. the number of nodes instead of quadratically in the full unstructured matrix case.

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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