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Statistische Methoden in der Computerlinguistik Statistical Methods in Computational Linguistics 7. Machine Learning Jonas Kuhn Universität Potsdam, 2007

Addition: Good-Turing Smoothing ,[object Object],[object Object],[object Object]

Machine Learning Overview ,[object Object],[object Object]

Machine Learning ,[object Object],[object Object],[object Object],[object Object]

Well-Posed Learning Problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Designing a Learning System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Training Experience ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Target Function and Learned Function ,[object Object],[object Object],[object Object],[object Object]

Learning Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object]

Supervised Learning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Variations of Machine Learning ,[object Object],[object Object],[object Object],[object Object]

Learning and Generalization ,[object Object],[object Object],[object Object],[object Object],[object Object]

Approaches to Machine Learning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],First focus: Naïve Bayes classifier

Decision Tree Example: Name Recognition Capitalized? Sentence-Inital? Yes No No 0 0 1 1

Decision Tree Example: Name Recognition

Bayesian Learning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Towards Naive Bayes Classification ,[object Object],[object Object],[object Object],[object Object]

Naive Bayes Classifier ,[object Object]

Learning a Naive Bayes Classifier ,[object Object],[object Object],[object Object]

Decision Tree Learning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example: Name Recognition Capitalized? Sentence-Inital? Yes No No 0 0 1 1

Appropriate Problems for Decision Tree Learning ,[object Object],[object Object],[object Object],[object Object],[object Object]

The ID3 Learning Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Selecting the Best Attribute ,[object Object],[object Object],[object Object]

Hypothesis Space Search and Inductive Bias ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Overfitting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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