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Faster Stochastic Variational Inference using Proximal-Gradient Methods with General Divergence Functions
Proceedings of the 32nd Conference on Uncertainty in Artificial Intelligence, PMLR R14:572-581, 2016.
Abstract
Several recent works have explored stochastic gradient methods for variational inference that exploit the geometryof the variational-parameter space. However, the theoretical properties of these methods are not well-understoodand these methods typically only apply to conditionally-conjugate models. We present a new stochastic methodfor variational inference which exploits the geometry of the variational-parameter space and also yields simple closed-formupdates even for non-conjugate models. We also give a convergence-rate analysis of our method and many other previous methods which exploit the geometry of the space.Our analysis generalizes existing convergence results for stochastic mirror-descent on non-convex objectivesby using a more general class of divergence functions.Beyond giving a theoretical justification for a variety of recent methods, our experiments show thatnew algorithms derived in this framework lead to state of the art results on a variety of problems.Further, due to its generality, we expect that our theoretical analysis could also apply to other applications.