LING 6520: Comparative Topics in Linguistics (from a computational perspective) - PowerPoint PPT Presentation

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LING 6520: Comparative Topics in Linguistics (from a computational perspective)

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  1. LING 6520: Comparative Topics in Linguistics (from a computational perspective) Martha Palmer Jan 15, 2008

  2. What does Linguistics offer Computational Lexical Semantics? • What does Computational Lexical Semantics offer Linguistics? • What can we do together?

  3. 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

  4. 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

  5. Feature-based Lexicalized Tree-Adjoining GrammarsJoshi,et al 75, Joshi 85, • Elementary trees • Initial trees • Auxiliary trees • Two operations • Substitution • Adjunction

  6. Same event - different syntactic frames • John broke windows. • SUBJ VERB OBJ • Windows broke. • SUBJ VERB

  7. Syntactic Parses

  8. Elementary Trees

  9. Substitution S VP NP↓ NP NP NP↓ V John det N break the window

  10. Substitution S VP NP↓ NP NP↓ NP↓ V John det N break the window

  11. Derived Tree S VP NP↓ NP ↓ V John det N break the window

  12. Feature-based Substitution S VP+sing +past NP↓ NP+sing NP NP↓ V John det N break the window

  13. Derived Tree w/ Features S VP +sing +past NP+sing NP↓ V John det N break the window 4/1/04

  14. Adjunction S VP NP↓ VP NP↓ V John Adv VP * det N break quickly the window 4/1/04

  15. VP * NP↓ V det N break the window Adjunction (cont.) S VP NP↓ Adv John quickly 4/1/04

  16. Extending Senses Through Adjunction 4/1/04