02-uninformed_search - Intelligent Agents Foundations of...

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Foundations of Artificial Intelligence Problem-Solving as Search CS472 – Fall 2007 Thorsten Joachims Intelligent Agents Agent : Anything that can be viewed as perceiving its environment through sensors and acting upon that environment through actuators . Agent Function: Agent behavior is determined by the agent function that maps any given percept sequence to an action. Agent Program : The agent function for an artificial agent will be implemented by an agent program. A Simple Reflex Agent Environment What the world is like now What action I should do now Condition-action rules Sensors Agent Actuators Agent with Model and Internal State Environment What the world is like now What action I should do now Condition-action rules Sensors Agent Actuators How the world evolves What my actions do State Goal-Based Agent Environment What the world is like now What action I should do now Goals Sensors Agent Actuators How the world evolves What my actions do State What it will be like if I do action A Problem Solving as Search - Search is a central topic in AI - Originated with Newell and Simon's work on problem solving. Famous book: “Human Problem Solving” (1972) - Automated reasoning is a natural search task - More recently: Given that almost all AI formalisms (planning, learning, etc.) are NP-complete or worse, some form of search is generally unavoidable (no “smarter” algorithm available).
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  • Summer '07
  • JOACHIMS
  • Artificial Intelligence, Depth-first search, natural search, Search algorithms, Thorsten Joachims

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