Recent years have witnessed exciting progress in the study of stochastic variance reduced gradient methods (e.g., SVRG, SAGA), their accelerated variants (e.g, Katyusha) and their extensions in many different settings (e.g., online, sparse, asynchronous, distributed). Among them, accelerated methods enjoy improved convergence rates but have complex coupling structures, which makes them hard to be extended to more settings (e.g., sparse and asynchronous) due to the existence of perturbation. In this paper, we introduce a simple stochastic variance reduced algorithm (MiG), which enjoys the best-known convergence rates for both strongly convex and non-strongly convex problems. Moreover, we also present its efficient sparse and asynchronous variants, and theoretically analyze its convergence rates in these settings. Finally, extensive experiments for various machine learning problems such as logistic regression are given to illustrate the practical improvement in both serial and asynchronous settings.

本篇论文介绍了一种简单的随机方差减小(MiG)算法及其在强凸和非强凸问题中最佳的收敛速率，并在稀疏和异步情况下介绍了其有效的变体并在这些情况下理论化分析其收敛速率。最后，我们进行了大量的实验，如逻辑回归等，以证明在串行和异步设置中的实际改进。

一个简单的随机方差减少算法，具有快速收敛速率