An Applied Ontological Approach to Computational Semantics Sam Zhang.

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Presentation transcript:

An Applied Ontological Approach to Computational Semantics Sam Zhang

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

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

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

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

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

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

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

Sources Image: Wordnet: NLTK: OpenCyc: Ontological semantics, a history and overview: