An overview of the Natural Language Toolkit

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Presentation transcript:

An overview of the Natural Language Toolkit nltk.sourceforge.net

Summary NLTK is a suite of open source Python modules, data sets and tutorials supporting research and development in natural language processing Download NLTK from nltk.sourceforge.net

Components of NLTK Code: corpus readers, tokenizers, stemmers, taggers, chunkers, parsers, wordnet, ... (50k lines of code) Corpora: 20+ annotated data sets widely used in natural language processing (300Mb data) Documentation: a 360-page book, articles, reviews, API documentation

1. Code corpus readers tokenizers stemmers taggers parsers wordnet semantic interpretation clusterers evaluation metrics …

2. Corpora Brown Corpus Carnegie Mellon Pronouncing Dictionary CoNLL 2000 Chunking Corpus Project Gutenberg Selections NIST 1999 Information Extraction: Entity Recognition Corpus US Presidential Inaugural Address Corpus Indian Language POS-Tagged Corpus Prepositional Phrase Attachment Corpus SENSEVAL 2 Corpus Sinica Treebank Corpus Sample Universal Declaration of Human Rights Corpus Stopwords Corpus TIMIT Corpus Sample Treebank Corpus Sample …

3. Documentation a 360-page book about natural language processing in Python and NLTK teaches Python and NLP provides numerous examples and exercises installation instructions presentation slides for some of the book chapters API Documentation: describes every module, interface, class, and method

Parser demonstrations

Interactive session (WordNet)

Adoption in NLP courses Amsterdam, Ben-Gurion, Brown, Bryn Mawr, CDAC-Mumbai, Coruña, Edinburgh, Erlangen, Georgetown, Helsinki, IIT-Bombay, Iowa State, Konstanz, MIT, Macquarie, Magdeburg, Malta, Marquette, Melbourne, Nancy, Naval Postgraduate School, Northeastern, Ohio State, Pitt, San Diego State, Simon Fraser, Stanford, Syracuse University, Tsuda College, U Colorado, UC Berkeley, UMass Amherst, UNAM, U Penn, UT Austin, Warsaw

Contribute… NLTK is an open source project all code, data, documentation is free dozens of people have contributed over the past 6 years please visit the website for project ideas sign up on the NLTK-Announce mailing list to hear about new releases

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