Presentation on theme: "Leksička semantika i pragmatika 6. predavanje. Headlines Police Begin Campaign To Run Down Jaywalkers Iraqi Head Seeks Arms Teacher Strikes Idle Kids."— Presentation transcript:
Headlines Police Begin Campaign To Run Down Jaywalkers Iraqi Head Seeks Arms Teacher Strikes Idle Kids Miners Refuse To Work After Death Juvenile Court To Try Shooting Defendant LING 2000 - 2006 NLP2
Kinds of knowledge needed? Consider the following interaction with HAL the computer from 2001: A Space Odyssey Dave: Open the pod bay doors, Hal. HAL: I’m sorry Dave, I’m afraid I can’t do that.
Knowledge needed to build HAL? Speech recognition and synthesis –Dictionaries (how words are pronounced) –Phonetics (how to recognize/produce each sound of English) Natural language understanding –Knowledge of the English words involved What they mean How they combine (what is a `pod bay door’?) –Knowledge of syntactic structure I’m I do, Sorry that afraid Dave I’m can’t
What’s needed? Dialog and pragmatic knowledge –“open the door” is a REQUEST (as opposed to a STATEMENT or information-question) –It is polite to respond, even if you’re planning to kill someone. –It is polite to pretend to want to be cooperative (I’m afraid I can’t…) –What is `that’ in `I can’t do that’? Even a system to book airline flights needs much of this kind of knowledge
Eliza: Weizenbaum (1966) User: You are like my father in some ways. ELIZA: What resemblance do you see User: You are not very aggressive but I think you don’t want me to notice that. ELIZA: What makes you think I am not aggressive User: You don’t argue with me ELIZA: Why do you think I don’t argue with you User: You are afraid of me ELIZA: Does it please you to believe I am afraid of you