AN ENSEMBLE OF PROXIMAL NETWORKS FOR SPARSE CODING

Reddy Nareddy, KK and Mache, S and Pokala, PK and Seelamantula, CS (2022) AN ENSEMBLE OF PROXIMAL NETWORKS FOR SPARSE CODING. In: Proceedings - International Conference on Image Processing, ICIP, 16 - 19 October 2022, Bordeaux, pp. 1251-1255.

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Abstract

Sparse coding methods are iterative and typically rely on proximal gradient methods. While the commonly used sparsity promoting penalty is the ℓ1 norm, alternatives such as the minimax concave penalty (MCP) and smoothly clipped absolute deviation (SCAD) penalty have also been employed to obtain superior results. Combining various penalties to achieve robust sparse recovery is possible, but the challenge lies in parameter tuning. Given the connection between deep networks and unrolling of iterative algorithms, it is possible to unify the unfolded networks arising from different formulations. We propose an ensemble of proximal networks for sparse recovery, where the ensemble weights are learnt in a data-driven fashion. We found that the proposed network performs superior to or on par with the individual networks in the ensemble for synthetic data under various noise levels and sparsity conditions. We demonstrate an application to image denoising based on the convolutional sparse coding formulation.

Item Type:	Conference Paper
Publication:	Proceedings - International Conference on Image Processing, ICIP
Publisher:	IEEE Computer Society
Additional Information:	The copyright for this article belongs to IEEE Computer Society.
Keywords:	Computer system recovery; Computer vision; Image coding; Image denoising; Network coding, Coding methods; Deep-unfolding; Ensemble networks; Gradient's methods; Minimax; Nonconvex optimization; Nonconvex-optimization; Sparse coding; Sparse recovery; Unfoldings, Gradient methods
Department/Centre:	Division of Mechanical Sciences > Centre for Earth Sciences Division of Electrical Sciences > Electrical Engineering
Date Deposited:	10 Feb 2023 08:44
Last Modified:	10 Feb 2023 08:44
URI:	https://eprints.iisc.ac.in/id/eprint/80157

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