A generalized forward-backward splitting operator: Degenerate analysis and applications

Abstract

In this paper, we study the nonexpansive properties of a generalized forward-backward splitting (G-FBS) operator, particularly under the setting of degenerate metric, from which follow the convergence results in terms of degenerate metric of the associated fixed-point iterations. The descent lemma and sufficient decrease property are also extended to degenerate case. It is further shown that the G-FBS operator provides a simplifying and unifying framework to model and analyze a great variety of operator splitting algorithms, many existing results are exactly recovered or relaxed from our general results.

arXiv comment31 pages. published in Computational and Applied Mathematics, 2023. arXiv admin note: text overlap with arXiv:2108.06502