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Advanced Search Results For "SPARSE approximations"

1 - 10 of 3,250 results for
 "SPARSE approximations"
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Non-uniform Nyström approximation for sparse kernel regression: Theoretical analysis and experimental evaluation.

Publication Type:Academic Journal

Source(s):Neurocomputing. Aug2022, Vol. 501, p410-419. 10p.

Abstract:Solving a kernel regression problem usually suffers from expensive computation and storage costs due to the large kernel size. To tackle this problem, the Nyström method is proposed and widely applied to large-scale kernel methods as an approximate sol...

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A Wavelet Plancherel Theory with Application to Multipliers and Sparse Approximations.

Publication Type:Academic Journal

Source(s):Numerical Functional Analysis & Optimization. 2022, Vol. 43 Issue 11, p1303-1400. 98p.

Abstract:We introduce an extension of continuous wavelet theory that enables an efficient implementation of multiplicative operators in the coefficient space. In the new theory, the signal space is embedded in a larger abstract signal space – the so called wind...

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Sparse PSD approximation of the PSD cone.

Publication Type:Academic Journal

Source(s):Mathematical Programming. Feb2022, Vol. 191 Issue 2, p981-1004. 24p.

Abstract:While semidefinite programming (SDP) problems are polynomially solvable in theory, it is often difficult to solve large SDP instances in practice. One technique to address this issue is to relax the global positive-semidefiniteness (PSD) constraint and...

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Sparse Approximation of the Precision Matrices for the Wide-Swath Altimeters.

Publication Type:Academic Journal

Source(s):Remote Sensing. Jun2022, Vol. 14 Issue 12, pN.PAG-N.PAG. 11p.

Abstract:The upcoming technology of wide-swath altimetry from space will deliver a large volume of data on the ocean surface at unprecedentedly high spatial resolution. These data are contaminated by errors caused by the uncertainties in the geometry and orient...

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Sparse representation of approximation to identity.

Publication Type:Academic Journal

Source(s):Analysis & Applications. Jul2022, Vol. 20 Issue 4, p815-837. 23p.

Abstract:The Dirac- δ distribution may be realized through sequences of convolutions, the latter being also regarded as approximation to the identity. This paper proposes the real form of pre-orthogonal adaptive Fourier decomposition (POAFD) method to realize f...

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Sparse Approximation of Triangular Transports, Part II: The Infinite-Dimensional Case.

Publication Type:Academic Journal

Source(s):Constructive Approximation. Jun2022, Vol. 55 Issue 3, p987-1036. 50p.

Abstract:For two probability measures ρ and π on [ - 1 , 1 ] N we investigate the approximation of the triangular Knothe–Rosenblatt transport T : [ - 1 , 1 ] N → [ - 1 , 1 ] N that pushes forward ρ to π . Under suitable assumptions, we show that T can be approx...

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Sparse Approximation of Triangular Transports, Part I: The Finite-Dimensional Case.

Publication Type:Academic Journal

Source(s):Constructive Approximation. Jun2022, Vol. 55 Issue 3, p919-986. 68p.

Abstract:For two probability measures ρ and π with analytic densities on the d-dimensional cube [ - 1 , 1 ] d , we investigate the approximation of the unique triangular monotone Knothe–Rosenblatt transport T : [ - 1 , 1 ] d → [ - 1 , 1 ] d , such that the push...

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SAR Image Target Recognition Based on Monogenic Signal and Sparse Representation.

Publication Type:Academic Journal

Source(s):Wireless Communications & Mobile Computing. 1/18/2021, p1-11. 11p.

Abstract:It is necessary to recognize the target in the situation of military battlefield monitoring and civilian real-time monitoring. Sparse representation-based SAR image target recognition method uses training samples or feature information to construct an ...

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Several approximation algorithms for sparse best rank-1 approximation to higher-order tensors.

Publication Type:Academic Journal

Source(s):Journal of Global Optimization; Sep2022, Vol. 84 Issue 1, p229-253, 25p

Abstract:Copyright of Journal of Global Optimization is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, d...

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Robust low-rank multiple kernel learning with compound regularization.

Publication Type:Academic Journal

Source(s):European Journal of Operational Research. Dec2021, Vol. 295 Issue 2, p634-647. 14p.

Abstract:• We propose a robust multiple kernel learning approach. • A novel compound regularization is proposed and studied. • The optimal kernels are selected using penalization with positive constraint. • Computational and theoretical properties of proposed a...

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