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Machine Learning Summer School 2005 - Canberra
Pascal

Exponential Families in Feature Space - Part 6

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
0:02 Gaussian Processes
4:17 Our Model and GP
13:22 Representer Theorem
14:46 GP and Missing Variables
15:03 Conjugate Priors
15:05 Novelty Detection
15:10 Novelty Detection
25:18 Optimization Problems
31:32 Odds Ratio
33:17 Multiclass SVM
34:25 Odds Ratio
37:25 Multiclass SVM
41:34 Multiclass SVM - II
42:17 Optimal Separating Hyperplane
42:35 Multiclass SVM - II
43:49 Optimal Separating Hyperplane
45:44 Introducing Slack
47:46 Dual Problem
48:16 Another Formulation
48:21 A Laundry List
48:27 Odds Ratio and Missing Vars
49:26 Multiclass SVM - II
49:40 Odds Ratio and Missing Vars
50:47 Constrained CCCP
58:04 Take Home Message

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