18
Representing Commonsense Knowledge
18.1 The Commonsense World
18.1.1 What Is Commonsense Knowledge?
I have illustrated several AI techniques using puzzles and games and the grid world of locations, walls, doors, batteries, and blocks. We expanded our view slightly in the last chapter when I illustrated forward and backward reasoning with a very simple expert system for deciding about loan applications. Real expert systems, of course, have many more facts and rules than did my illustrative example, but even so they contain limited knowledge about quite circumscribed domains.
Much more extensive knowledge will be required for truly versatile, human-level AI systems. And these systems will need to know about many topics that have proved difficult ...
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