Introduction to Artificial Intelligence

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Artificial Intelligence
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Presentation transcript:

Introduction to Artificial Intelligence ITK 340, Spring 2006

For next Wednesday Read Russell and Norvig, chapters 1 & 2 Chapter 1, exercises 1, 7 (any 3 parts), 9 and 10. Send email to mecaliff@ilstu.edu from your preferred email address Student information sheet No class Friday or Monday

Course Info Instructor Textbook Syllabus

Course Expectations

What is AI, anyway? Artificial Intelligence The artificial part is easy--we’re building machines and computer programs Intelligence, however, is not well-defined Some things that require great intelligence in human being are easy for computers Other things that are easy for most (all?) humans are very difficult for computers

Categorizing the Definitions Acting or thinking Some definitions focus on thinking and reasoning, on the “mind” of the machine Others focus on acting, on the behavior of the machine (whether there’s real thought behind it may not matter?) Human or rational Some definitions measure the computer against humans Others focus on rationality--an ideal concept of intelligence

Thinking Humanly “The exciting new effort to make computers think … machines with minds, in the full and literal sense” (Haugeland, 1985) “[The automation of] activities that we associate with human thinking, activities such as decision-making, problem solving, learning …” (Bellman, 1978)

Thinking Humanly The cognitive modeling approach Interested not only in solving the problem, but also in mimicking human thought processes This is where AI is most closely related to cognitive science

Acting Humanly “The art of creating machines that perform functions that require intelligence when performed by people” (Kurzweil, 1990) “The study of how to make computers do things at which, at the moment, people are better” (Rich and Knight, 1991)

Acting Humanly The “Turing Test” Approach Focus is on how the system behaves, not how it works inside Performance is measured against human performance Biggest problem is the question of the value of the test--but we can’t pass it yet Development of practical systems

Thinking Rationally “The study of mental faculties through the use of computational models” (Charniak and McDermott, 1985) “The study of the computations that make it possible to perceive, reason, and act” (Winston, 1992)

Thinking Rationally The laws of thought approach Focus on logic--making correct inferences Problems Difficulty of formulating some types of knowledge logically Solving in principal vs. solving in practice Strong contributions in reasoning and knowledge representation

Acting Rationally “A field of study that seeks to explain and emulate intelligent behavior in terms of computational processes” (Schalkoff, 1990) “The branch of computer science that is concerned with the automation of intelligent behavior” (Luger and Stubblefield, 1993)

Acting Rationally The rational agent approach Instead of thinking the right way, focuses on doing the right thing More general than laws of thought More testable than comparing to human behavior Approach taken by your text

What Do You Know? Examples of artificial intelligence in your life? Can you name any of the areas of AI?