HOMEWORK 3 (CS 2731 / ISSP 2230)

Assigned: November 17, 2003

Due: December 1, 2003

Exercises

1. Representing Meaning and Semantic Analysis (40 points)
   
   (a) Create a FOPC meaning representation for the sentence "Diane handed Mihai a book." Use FrameNet to motivate your representation (and explain how you have done so). Give another sentence that has a different syntactic parse, but that would yield the same meaning representation.
   
   (b) Write a CFG grammar with semantic attachments to handle "Diane handed Mihai a book", 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 for the VERBS "kill" and "eat".
   
   (b) Exercise 16.7, Jurafsky and Martin (p. 629), again just for the VERBS "kill" and "eat". Use as your corpus Genesis and the two Holmes stories from Homework 2. 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 consisiting of the two Holmes stories from Homework2, for two broad senses of the word "dark". To make better use of this rather small corpus, you can use morphological variations like "darkness" as well as "dark".
   
   Discuss how well your approach worked. Also discuss how your two senses map onto the Wordnet senses for "dark."