383-Fall11-Lec7 - Beyond Classical Search Local Search Part...

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1 CMPSCI 383 September 27, 2011 Beyond Classical Search: Local Search Part 2: Nondeterministic actions, partial observability,online search
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2 Today’s lecture Nondeterministic actions Partial Observations Online Search
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3 The Vacuum-Cleaner World
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4 Vacuum-Cleaner World Transition Model Deterministic actions, observable, known goal states
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5 Erratic Vacuum World Suck action: applied to a dirty square, cleans the square but sometimes cleans adjacent square; applied to a clean square, sometimes deposits dirt. Set of resulting states for each action
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6 Contigency Plan In deterministic case, solution is a of actions. In nondeterminsitic (and stochastic) case, solution is a strategy or policy (or contingency plan, or control policy) : If states can be observed: a function from relevant states to actions: Π : States Actions If only “percepts” available: Π : Percepts Actions Can be expressed using if-then-else statements
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7 And-Or Tree agent’s action “environment’s action”
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