English

Distributed Gradient Methods for Nonconvex Optimization: Local and Global Convergence Guarantees

Optimization and Control 2020-09-17 v2

Abstract

The article discusses distributed gradient-descent algorithms for computing local and global minima in nonconvex optimization. For local optimization, we focus on distributed stochastic gradient descent (D-SGD)--a simple network-based variant of classical SGD. We discuss local minima convergence guarantees and explore the simple but critical role of the stable-manifold theorem in analyzing saddle-point avoidance. For global optimization, we discuss annealing-based methods in which slowly decaying noise is added to D-SGD. Conditions are discussed under which convergence to global minima is guaranteed. Numerical examples illustrate the key concepts in the paper.

Keywords

Cite

@article{arxiv.2003.10309,
  title  = {Distributed Gradient Methods for Nonconvex Optimization: Local and Global Convergence Guarantees},
  author = {Brian Swenson and Soummya Kar and H. Vincent Poor and José M. F. Moura and Aaron Jaech},
  journal= {arXiv preprint arXiv:2003.10309},
  year   = {2020}
}
R2 v1 2026-06-23T14:24:04.998Z