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• W68551808 abstract "In multi-response regression, pursuit of two different types of structures is essential to battle the curse of dimensionality. In this paper, we seek a sparsest decomposition representation of a parameter matrix in terms of a sum of sparse and low rank matrices, among many overcomplete decompositions. On this basis, we propose a constrained method subject to two nonconvex constraints, respectively for sparseness and low-rank properties. Computationally, obtaining an exact global optimizer is rather challenging. To overcome the difficulty, we use an alternating directions method solving a low-rank subproblem and a sparseness subproblem alternatively, where we derive an exact solution to the low-rank subproblem, as well as an exact solution in a special case and an approximated solution generally through a surrogate of the L0-constraint and difference convex programming, for the sparse subproblem. Theoretically, we establish convergence rates of a global minimizer in the Hellinger-distance, providing an insight into why pursuit of two different types of decomposed structures is expected to deliver higher estimation accuracy than its counterparts based on either sparseness alone or low-rank approximation alone. Numerical examples are given to illustrate these aspects, in addition to an application to facial imagine recognition and multiple time series analysis." @default.
• W68551808 created "2016-06-24" @default.
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• W68551808 creator A5074904348 @default.
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• W68551808 date "2015-01-01" @default.
• W68551808 modified "2023-09-23" @default.
• W68551808 title "Simultaneous pursuit of sparseness and rank structures for matrix decomposition" @default.
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• W68551808 hasPublicationYear "2015" @default.
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