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Title:Variational Message Passing
Authors: John Winn ; Christopher Bishop
Date: 2005
Publication Title:Journal of Machine Learning Research
Publisher:Microtome publishing
Publication Type:Journal Article Publication Status:Published
Volume No:6 Page Nos:661-694
Bayesian inference is now widely established as one of the principal foundations for machine learning. In practice, exact inference is rarely possible, and so a variety of approximation techniques have been developed, one of the most widely used being a deterministic framework called variational inference. In this paper we introduce Variational Message Passing (VMP), a general purpose algorithm for applying variational inference to Bayesian Networks. Like belief propagation, VMP proceeds by sending messages between nodes in the network and updating posterior beliefs using local operations at each node. Each such update increases a lower bound on the log evidence (unless already at a local maximum). In contrast to belief propagation, VMP can be applied to a very general class of conjugate-exponential models because it uses a factorised variational approximation. Furthermore, by introducing additional variational parameters, VMP can be applied to models containing non-conjugate distributions. The VMP framework also allows the lower bound to be evaluated, and this can be used both for model comparison and for detection of convergence. Variational message passing has been implemented in the form of a general purpose inference engine called VIBES ('Variational Inference for BayEsian networkS') which allows models to be specified graphically and then solved variationally without recourse to coding.
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Bibtex format
author = { John Winn and Christopher Bishop },
title = {Variational Message Passing},
journal = {Journal of Machine Learning Research},
publisher = {Microtome publishing},
year = 2005,
volume = {6},
pages = {661-694},
url = {},

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