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Machine Learning Summer School 2005 - Canberra
Pascal

Exponential Families in Feature Space - Part 5

author: S.V.N. Vishwanathan, National ICT Australia

Description

In this introductory course we will discuss how log linear models can be extended to feature space. These log linear models have been studied by statisticians for a long time under the name of exponential family of probability distributions. We provide a unified framework which can be used to view many existing kernel algorithms as special cases. Our framework also allows us to derive many natural generalizations of existing algorithms. In particular, we show how we can recover Gaussian Processes, Support Vector Machines, multi-class discrimination, and sequence annotation (via Conditional Random Fields). We also show to deal with missing data and perform MAP estimation on Conditional Random Fields in feature space. The requisite background for the course will be covered briskly in the first two lectures. Knowledge of linear algebra and familiarity with functional analysis will be helpful.

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Slides
0:01 Exponential Families
1:11 Overview
2:26 Machine Learning
4:51 Exponential Family
10:37 Log-Partition Function
14:44 Some Examples
15:03 Kernels
22:38 Unconditional Models
27:57 Conditional Models
29:49 Handling Missing Variables
36:01 Max-Likelihood Estimation
39:09 MAP Estimation

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