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Machine Learning: Generative and Discriminative Models

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Machine Learning: Generative and Discriminative ModelsSargur N. Learning Course: ~srihari/CSE574 LearningSrihari2Outline of Presentation1. What is Machine Learning?ML applications, ML as Search2. Generative and Discriminative Taxonomy3. Generative - Discriminative PairsClassifiers: Na ve Bayes and Logistic RegressionSequential Data: HMMs and CRFs4. Performance Comparison in Sequential ApplicationsNLP: Table extraction, POS tagging, Shallow parsing, Handwritten word recognition, Document analysis5. Advantages, disadvantages6. Summary7. ReferencesMachine LearningSrihari31. Machine Learning Programming computers to use example data or past experience Well-Posed Learning Problems A computer program is said to learn from experience E with respect to class of tasks T and performance measure P, if its performance at tasks T, as measured by P, improves with experience LearningSrihari4Problems Too Difficult To Program by Hand Learning to drive an autonomous vehicle Train computer-controlled vehicles to steer correctly Drive at 70 mph for 90 miles on public highways Associate steering commands with image sequencesTask T: driving on publ

• Gaussians, Naïve Bayes, Mixtures of multinomials • Mixtures of Gaussians, Mixtures of experts, Hidden Markov Models (HMM) ... – by fitting Gaussian class-conditional densities will result in . 2M . parameters for means, M(M+1)/2 ... Markov Random Field (MRF)

  Field, Mixtures, Random, Gaussian, Markov, Markov random field

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