UT CS 388 - Word Sense Disambiguation (59 pages)

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Word Sense Disambiguation



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Word Sense Disambiguation

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Pages:
59
School:
University of Texas at Austin
Course:
Cs 388 - Natural Language Processing

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CS 388 Natural Language Processing Word Sense Disambiguation Raymond J Mooney University of Texas at Austin 1 Lexical Ambiguity Most words in natural languages have multiple possible meanings pen noun The dog is in the pen The ink is in the pen take verb Take one pill every morning Take the first right past the stoplight Syntax helps distinguish meanings for different parts of speech of an ambiguous word conduct noun or verb John s conduct in class is unacceptable John will conduct the orchestra on Thursday 2 Motivation for Word Sense Disambiguation WSD Many tasks in natural language processing require disambiguation of ambiguous words Question Answering Information Retrieval Machine Translation Text Mining Phone Help Systems Understanding how people disambiguate words is an interesting problem that can provide insight in psycholinguistics 3 Sense Inventory What is a sense of a word Homonyms disconnected meanings bank financial institution bank sloping land next to a river Polysemes related meanings with joint etymology bank financial institution as corporation bank a building housing such an institution Sources of sense inventories Dictionaries Lexical databases 4 WordNet A detailed database of semantic relationships between English words Developed by famous cognitive psychologist George Miller and a team at Princeton University About 144 000 English words Nouns adjectives verbs and adverbs grouped into about 109 000 synonym sets called synsets 5 WordNet Synset Relationships Antonym front back Attribute benevolence good noun to adjective Pertainym alphabetical alphabet adjective to noun Similar unquestioning absolute Cause kill die Entailment breathe inhale Holonym chapter text part to whole Meronym computer cpu whole to part Hyponym plant tree specialization Hypernym apple fruit generalization 6 EuroWordNet WordNets for Dutch Italian Spanish German French Czech Estonian 7 WordNet Senses WordNets senses like many dictionary senses tend to be very fine grained play



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