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Practice-Consistent Analysis of Adam-Style Methods
Zhishuai Guo · Yi Xu · Wotao Yin · Rong Jin · Tianbao Yang
In this paper, we present a simple and intuitive proof of convergence for a family of Adam-style methods (including Adam, AMSGrad, Adabound, etc.) with an increasing or large "momentum" parameter for the first-order moment, which gives an alternative yet more natural way to guarantee Adam converge in stochastic non-convex minimization. We also establish a variance diminishing result for the used stochastic gradient estimators. The analysis is based on a widely used but not fully understood stochastic estimator using moving average (SEMA), which only requires a general unbiased stochastic oracle. In particular, we analyze Adam-style methods based on the variance recursion property of SEMA for stochastic non-convex minimization.
Author Information
Zhishuai Guo (University of Iowa)
Yi Xu (Alibaba Group)
Wotao Yin (Alibaba US, DAMO Academy)
Rong Jin (Alibaba)
Tianbao Yang (The University of Iowa)
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