A Stochastic Operator Framework for Optimization and Learning With Sub-Weibull Errors

doi:10.1109/TAC.2024.3419186

A Stochastic Operator Framework for Optimization and Learning With Sub-Weibull Errors

2024-12-01

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DOI：10.1109/TAC.2024.3419186

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This article proposes a framework to study the convergence of stochastic optimization and learning algorithms. The framework is modeled over the different challenges that these algorithms pose, such as 1) the presence of random additive errors (e.g., due to stochastic gradients), and 2) random coordinate updates (e.g., due to asynchrony in distributed set-ups). The article covers both convex and strongly convex problems, and it also analyzes online scenarios, involving changes in the data and costs. This article relies on interpreting stochastic algorithms as the iterated application of stochastic operators, thus allowing us to use the powerful tools of operator theory. In particular, we consider operators characterized by additive errors with sub-Weibull distribution (which parameterize a broad class of errors by their tail probability), and random updates. In this framework, we derive convergence results in mean and high probability, by providing bounds to the distance of the current iteration from a solution of the optimization or learning problem. The contributions are discussed in light of federated learning applications.

Keywords:

Stochastic processes

Convergence

Tail

Optimization

Additives

Random variables

Data models

Federated learning

high probability convergence

inexact optimization

online optimization

stochastic operators

A Stochastic Operator Framework for Optimization and Learning With Sub-Weibull Errors

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