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arXiv · 2109.07117

Non-Asymptotic Analysis of Stochastic Approximation Algorithms for Streaming Data

Antoine Godichon-Baggioni·Nicklas Werge·Olivier Wintenberger
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Abstract

We introduce a streaming framework for analyzing stochastic approximation/optimization problems. This streaming framework is analogous to solving optimization problems using time-varying mini-batches that arrive sequentially. We provide non-asymptotic convergence rates of various gradient-based algorithms; this includes the famous Stochastic Gradient (SG) descent (a.k.a. Robbins-Monro algorithm), mini-batch SG and time-varying mini-batch SG algorithms, as well as their iterated averages (a.k.a. Polyak-Ruppert averaging). We show i) how to accelerate convergence by choosing the learning rate according to the time-varying mini-batches, ii) that Polyak-Ruppert averaging achieves optimal convergence in terms of attaining the Cramer-Rao lower bound, and iii) how time-varying mini-batches together with Polyak-Ruppert averaging can provide variance reduction and accelerate convergence simultaneously, which is advantageous for many learning problems, such as online, sequential, and large-scale learning. We further demonstrate these favorable effects for various time-varying mini-batches.

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Antoine Godichon-Baggioni, Nicklas Werge, Olivier Wintenberger. 2023-04-24. Non-Asymptotic Analysis of Stochastic Approximation Algorithms for Streaming Data. https://doi.org/10.1051/ps%2F2023006

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