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Thursday 05 February 2009, 14:00-15:30
Divergence measures and message passing - CANCELLED
- đ¤ Speaker: David Knowles (University of Cambridge)
- đ Date & Time: Thursday 05 February 2009, 14:00 - 15:30
- đ Venue: Engineering Department, CBL Room 438
Abstract
Unfortunately I’ve picked up a horrible fluey thing so I am cancelling. Apologies to all.
This paper by Tom Minka presents a unifying view of message-passing algorithms, as methods to approximate a complex Bayesian network by a simpler network with minimum information divergence. In this view, the difference between mean-field methods and belief propagation is not the amount of structure they model, but only the measure of loss they minimize: `exclusive’ versus `inclusive’ Kullback-Leibler divergence. Both these divergence measures can be viewed as examples of alpha-divergence for specific values of alpha. In each case, message-passing arises by minimizing a localized version of the divergence, local to each factor. By examining these divergence measures, we can intuit the types of solution they prefer (symmetry-breaking, for example) and their suitability for different tasks. Furthermore, by considering a wider variety of divergence measures (such as alpha-divergences), we can achieve different complexity and performance goals.
ftp://ftp.research.microsoft.com/pub/tr/TR-2005-173.pdf
Series This talk is part of the Machine Learning Reading Group @ CUED series.
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