A reminder for today's MITACS talk by Guido Montufar. Note that the seminar is NOT held in the usual location and will take place in the McNicoll Building, room Z-200.

---------- Forwarded message ---------- From: Guillaume Desjardins guillaume.desjardins@gmail.com Date: Thu, Mar 10, 2011 at 7:37 PM Subject: UdeM-McGill-MITACS machine learning seminar Mon March 14th @ 14h00, Z-200 To: lisa_seminaires@iro.umontreal.ca

A UdeM-McGill-MITACS machine learning seminar will be held this Monday, March 14th. The talk given by Guido Montúfar, will take place from 14h00-15h00 in the room Z-200 (McNicoll building) at the Université de Montréal. Hope to see you there !

Title: On Exponential Families and Expressive Power of Related Generative Models Speaker: Guido Montúfar

Abstract:

In this talk I will present results on exponential families which give information on the representational power of diverse generative models. Generative models are able to generate high order correlations among visible variables even when demanding a series of conditional independence conditions (important for efficient learning). The question is: how many hidden variables must they contain? Deep Belief Networks (DBNs) and Restricted Boltzmann Machines (RBMs) generate weighted sums of conditional distributions, which means they are special kinds of mixture models. I will discuss a scheme for decomposing probability distributions as mixtures of exponential families and from this derive some results for DBNs and RBMs.