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LING 581: Advanced Computational Linguistics

LING 581: Advanced Computational Linguistics. Lecture Notes March 29th. Today’s Topics. Part 1 Homework (hopefully) demystified + Presentations Part 2 Semantic Annotation of Organism Morphological Descriptions l ast week’s presentation from Prof. Hong Cui propose projects

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LING 581: Advanced Computational Linguistics

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  1. LING 581: Advanced Computational Linguistics Lecture Notes March 29th

  2. Today’s Topics Part 1 • Homework (hopefully) demystified • + Presentations Part 2 • Semantic Annotation of Organism Morphological Descriptions • last week’s presentation from Prof. Hong Cui • propose projects • corpora and glossaries: • USB stick directory 581-12/ passed around ….

  3. Quantifiers • Example: [S [NP [Q every][N man]][VP [V likes][NP John]]] • WordExpression • every λP1.[λP2.[∀X (P1(X) -> P2(X))]] • man man • likes λY.[λX.[ X likes Y]] • John John

  4. Quantifiers: Homework • Example: [S [NP [Q every][N man]][VP [V likes][NP John]]] • WordExpression • every λP1.[λP2.[∀X (P1(X) -> P2(X))]] • man man • likes λY.[λX.[ X likes Y]] • John John • Semantics: ∀X (man(X) -> [ X likes John]) Part 1: Montague-style Implement a Prolog grammar that assembles the equivalent Prolog query for the above sentence • Semantics (Prolog): \+ (man(X), \+likes(X,john)) Present your grammar and working examples of situations for which the Prolog query evaluates to true/false \+ (baby(X), \+walks(X)) is Prolog for ∀X (baby(X) -> walks(X)) (from lecture 9)

  5. Quantifiers: Homework • One possible grammar: want to call likes(_G318,John) Solution: make variables the same and then do the call

  6. Quantifiers: Homework • Situation #1: Nice thing about the grammar is that the computed expression is a real program Thus truth values for the sentence can be determined for particular situations • Situation #2:

  7. Quantifiers: Homework • Situation #3:

  8. Quantifiers: Homework Part 2: Barwise-Cooper-style • Syntax: [S [NP [Q every][N man]][VP [V likes][NP John]]] • Semantics: {X: man(X)} ⊆ {X: likes(X,John)} • Prolog : setof(X,man(X),S1), setof(X,likes(X,john),S1), subset(S1,S2). Implement a Barwise-Cooper style grammar and test the Prolog query on relevant situations. • Prolog programming help • Prolog predicate names cannot be variables • P(X). is illegal, p(X). is okay • p(X), X = john. is okay • P(X), P = man. isn’t • P =man, PX =.. [P,X]. is okay. (PX=man(X))

  9. Quantifiers: Homework • Grammar (first attempt):

  10. Quantifiers: Homework • Recall: semantics of setof/3 vs. bagof/3. vs. findall/3. setof(X,call(man,X),Set) fails when the set is empty

  11. Quantifiers: Homework • Modify setof/3 to return empty set instead of failing, call new predicate setof1/3:

  12. Quantifiers: Homework

  13. Quantifiers: Homework Part 3: Coordination • Extend your two grammars to handle • Every man and every woman likes John Make up homework exercise! do Part 3 given what you now know about Parts 1 and 2

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