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LING 6520: Comparative Topics in Linguistics (from a computational perspective). Martha Palmer Jan 15, 2008. What does Linguistics offer Computational Lexical Semantics? What does Computational Lexical Semantics offer Linguistics? What can we do together?. Linguistics → CLS.
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LING 6520: Comparative Topics in Linguistics (from a computational perspective) Martha Palmer Jan 15, 2008
What does Linguistics offer Computational Lexical Semantics? • What does Computational Lexical Semantics offer Linguistics? • What can we do together?
Linguistics → CLS • Syntactic structure – dependencies • Jackendoff • Lexical Conceptual Structures • Fillmore, Talmy, Dowty, …. • Case frames, conceptual analyses, proto-roles,…. • Levin’s English verb classes • Other languages? • Lexicographic sense distinctions • Discourse structure • Event representations
CLS → Linguistics • Quantitative analysis of data • Frequency counts, mutual information, automatic clustering, new & varied classifications • Word co-occurrences, subcat frame distributions, pp attachment preferences, word alignments • tomorrow • Grammatical formalisms • TAG’s, LFG’s, CCG’s, HPSG’s • Alternative building blocks for human sentence processing – models of regular sense extensions
Feature-based Lexicalized Tree-Adjoining GrammarsJoshi,et al 75, Joshi 85, • Elementary trees • Initial trees • Auxiliary trees • Two operations • Substitution • Adjunction
Same event - different syntactic frames • John broke windows. • SUBJ VERB OBJ • Windows broke. • SUBJ VERB
Substitution S VP NP↓ NP NP NP↓ V John det N break the window
Substitution S VP NP↓ NP NP↓ NP↓ V John det N break the window
Derived Tree S VP NP↓ NP ↓ V John det N break the window
Feature-based Substitution S VP+sing +past NP↓ NP+sing NP NP↓ V John det N break the window
Derived Tree w/ Features S VP +sing +past NP+sing NP↓ V John det N break the window 4/1/04
Adjunction S VP NP↓ VP NP↓ V John Adv VP * det N break quickly the window 4/1/04
VP * NP↓ V det N break the window Adjunction (cont.) S VP NP↓ Adv John quickly 4/1/04