Lecture 25-Communication and Language

Lecture 25-Communication and Language - CS 561 Artificial...

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CS 561: Artificial Intelligence Instructor: Sofus A. Macskassy, [email protected] TAs: Nadeesha Ranashinghe ( [email protected] ) William Yeoh ( [email protected] ) Harris Chiu ( [email protected] ) Lectures: MW 5:00-6:20pm, OHE 122 / DEN Office hours: By appointment Class page: http://www-rcf.usc.edu/~macskass/CS561-Spring2010/ This class will use http://www.uscden.net/ and class webpage - Up to date information - Lecture notes - Relevant dates, links, etc. Course material: [AIMA] Artificial Intelligence: A Modern Approach, by Stuart Russell and Peter Norvig. (2nd ed)
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CS561 - Lecture 25 - Macskassy - Spring 2010 2 Communication and Language [AIMA Ch 22] Communication Grammar Syntactic analysis Problems
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CS561 - Lecture 25 - Macskassy - Spring 2010 3 Communication “Classical” view (pre-1953): language consists of sentences that are true/false (cf. logic) “Modern” view (post-1953): language is a form of action Wittgenstein (1953) Philosophical Investigations Austin (1962) How to Do Things with Words Searle (1969) Speech Acts Why?
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CS561 - Lecture 25 - Macskassy - Spring 2010 4 Communication “Classical” view (pre-1953): language consists of sentences that are true/false (cf. logic) “Modern” view (post-1953): language is a form of action Wittgenstein (1953) Philosophical Investigations Austin (1962) How to Do Things with Words Searle (1969) Speech Acts Why? To change the actions of other agents
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CS561 - Lecture 25 - Macskassy - Spring 2010 5 Speech acts Speech acts achieve the speaker's goals: Inform “There's a pit in front of you” Query “Can you see the gold?” Command “Pick it up” Promise “I'll share the gold with you” Acknowledge “OK” Speech act planning requires knowledge of - Situation - Semantic and syntactic conventions - Hearer's goals, knowledge base, and rationality
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CS561 - Lecture 25 - Macskassy - Spring 2010 6 Stages in communication (informing) Intention S wants to inform H that P Generation S selects words W to express P in context C Synthesis S utters words W Perception H perceives W 0 in context C 0 Analysis H infers possible meanings P 1, …, P n Disambiguation H infers intended meaning P i Incorporation H incorporates P i into KB How could this go wrong? - Insincerity (S doesn't believe P ) - Speech wreck ignition failure - Ambiguous utterance - Differing understanding of current context ( C 6 = C 0 )
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CS561 - Lecture 25 - Macskassy - Spring 2010 7 Grammar Vervet monkeys, antelopes etc. use isolated symbols for sentences ) restricted set of communicable propositions, no
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Lecture 25-Communication and Language - CS 561 Artificial...

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