C SC 620Advanced Topics in NaturalLanguage ProcessingLecture Notes 21/20/04WordNet• What is it?– Synonym set (synset) network• for nouns, verbs, adjectives and adverbs– Synsets connected by semantic relations• E.g. isa, antonymy, etc.– It’s big!• 139,000 entries (word senses)• 10,000 verbs (polysemy 2)• 20,000 adjectives (1.5)– Originally designed as a model of human semanticmemory (Miller, 1985)WordNet: Noun isa hierarchyWordNet: Verb isa HierarchyWordNet: Adjective dumbellModelWordNet: Semantic Relationsx: abaxial, y: axialx pertains to yx per yx: applied, y: applyx participle of yx ppl yx: breathe, y: breathe outx, see also yx sa yx: present, y: absentx and y are antonymsx ant yx: behave, y: pretendy is similar to x (V)x vgp yx: anesthetize, y: sleepx causes yx cs yx: achromatic, y: whitey is similar to x (A)x sim yx: breathe, y: inhalex entails yx ent yx: repair, y: improvey is a hypernym of xx hyp
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