Testing and non-linear preconditioning of the proximal point method

Valkonen, Tuomo ORCID: 0000-0001-6683-3572 (2017) Testing and non-linear preconditioning of the proximal point method. Applied Mathematics and Optimization 82 (2020), 82 (2). pp. 591-636.

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Abstract

Employing the ideas of non-linear preconditioning and testing of the classical proximal point method, we formalise common arguments in convergence rate and convergence proofs of optimisation methods to the verification of a simple iteration-wise inequality. When applied to fixed point operators, the latter can be seen as a generalisation of firm non-expansivity or the $\alpha$-averaged property. The main purpose of this work is to provide the abstract background theory for our companion paper "Block-proximal methods with spatially adapted acceleration". In the present account we demonstrate the effectiveness of the general approach on several classical algorithms, as well as their stochastic variants. Besides, of course, the proximal point method, these method include the gradient descent, forward--backward splitting, Douglas--Rachford splitting, Newton's method, as well as several methods for saddle-point problems, such as the Alternating Directions Method of Multipliers, and the Chambolle--Pock method.

Item Type:	Article
Uncontrolled Keywords:	math.OC, math.OC
Depositing User:	Symplectic Admin
Date Deposited:	26 Apr 2017 08:08
Last Modified:	19 Jan 2023 07:09
DOI:	10.1007/s00245-018-9541-6
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3006588