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An Applied Ontological Approach to Computational Semantics

Sam Zhang. An Applied Ontological Approach to Computational Semantics. Ontology. - A web of knowledge organized in hierarchies. Odd One Out. Which of the following don't belong: Man Woman Tralfamadorian Boy Girl. Natural Language Toolkit. Python module Tutorial online Corpora.

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An Applied Ontological Approach to Computational Semantics

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  1. Sam Zhang An Applied Ontological Approach to Computational Semantics

  2. Ontology • - A web of knowledge organized in hierarchies

  3. Odd One Out • Which of the following don't belong: • Man • Woman • Tralfamadorian • Boy • Girl

  4. Natural Language Toolkit • Python module • Tutorial online • Corpora

  5. Wordnet: Lexical relations • Synonym / Antonym • Hypernym / Hyponym  : X and other Y • Meronym / Holonym • Entailments -- Verbnet

  6. OpenCyc • Which of the following don't belong: • Washington • Jefferson • Lincoln • Palin

  7. Algorithm • Distance/cosine measure from each word to other words • Word with longest average distance is odd one out

  8. Heuristic • Two sided search through lexical relations • Dynamic word sense disambiguation -- Which part of speech?  Which meaning?

  9. Example • How do I find a common element between Toothbrush and Toilet? • from nltk.corpus import wordnet as wn • toothbrush = wn.synset("toothbrush.n.01") • toilet = wn.synset("toilet.n.01") • #algorithm to spider hypernyms until they match

  10. Applications... And the Future • - Web 3.0 • - Literary criticism / Political analysis • ---------------------------------------- • - Supplement lexical relations from wordnet with own corpora search, especially from RSS feeds

  11. Sources • Image: http://nltk.googlecode.com/svn/trunk/doc/book/ch02.html • Wordnet: http://wordnet.princeton.edu • NLTK: http://nltk.googlecode.com • OpenCyc:  http://www.cyc.com/opencyc/overview • Ontological semantics, a history and overview: • http://crl.nmsu.edu/Staff.pages/Technical/sergei/book/realm.pdf

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