1. Leksička semantika i pragmatika 4. predavanje

2. Question Answering What does “door” mean? What year was Abraham Lincoln born? How many states were in the United States when Lincoln was born? Was there a military draft during the Hoover administration? What do US scientists think about whether human cloning should be legal?

3. Modern QA systems Still in infancy Simple factoid questions beginning to work OK Annual government-sponsored “bakeoff” called TREC

4. Ambiguity! World Knowledge – it’s needed for understanding, but computers don’t have it NLP4

5. Ambiguity Computational linguists are obsessed with ambiguity Ambiguity is a fundamental problem of computational linguistics Resolving ambiguity is a crucial goal

6. Ambiguity Find at least 5 meanings of this sentence: –I made her duck