HOMEWORK 3 (CS 2731 / ISSP 2230)

Assigned: November 14, 2002

Due: November 26, 2002

Exercises

1. Representing Meaning and Semantic Analysis (40 points)
   
   (a) Create a FOPC meaning representation for the sentence "Every store sells Panther clothing." Use FrameNet to motivate your representation (and explain how you have done so).
   
   (b) Write a CFG grammar with semantic attachments to handle this sentence, and show how it can be used to derive the target meaning representation.
   
   
2. Lexical Semantics (40 points)
   
   (a) Exercise 16.6, Jurafsky and Martin (p. 629), but just for the VERB "buy".
   
   (b) Exercise 16.7, Jurafsky and Martin (p. 629), again just for the VERB "buy". Your corpus should be big enough to verify that your selectional restrictions from part (a) work on several examples, and should also contain examples illustrating where they fall apart. Collect your corpus from any source you like (e.g. online newspapers, the web, online corpora). Use the constraint satisfaction viewpoint discussed in class.
   
   
3. Word Sense Disambiguation (20 points)
   
   Use the "one sense per collocation" bootstrapping approach to seed a training set with 5 sentences (from a corpus of your choosing), for EACH of the following WordNet senses of the noun "racket":
   
   
   1. a loud and disturbing noise
      
      
   2. an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit
      
      
   3. a sports implement (usually consisting of a handle and an oval frame with a tightly interlaced network of strings) used to strike a ball (or shuttlecock) in various games
      
      
   Discuss how well your approach worked.