lecture25 - Articial Intelligence Other Search and...

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Other Search and Optimization Methods; page 1 of 10 Artificial Intelligence Other Search and Optimization Methods Russell and Norvig Chapter 4
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Other Search and Optimization Methods; page 2 of 10 ? prediction predict f(x) for a given x optimization find an x so that f(x) is maximal is this search? is this reinforcement learning? playground example
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Other Search and Optimization Methods; page 3 of 10 gradient ascent (hillclimbing) evaluation current state
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Other Search and Optimization Methods; page 4 of 10 gradient ascent (hillclimbing) function H ILL -C LIMBING ( problem ) returns a solution state inputs : problem , a problem static : current , a node next , a node current M AKE -N ODE (I NITIAL -S TATE [ problem ]) loop do next a highest-valued successor of current if V ALUE [next] < V ALUE [current] then return current current next end x i = x i + α dVALUE/dx i learning rate (small positive constant)
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Other Search and Optimization Methods; page 5 of 10 problems with hillclimbing problems: - local maxima - plateaus - ridges -> random restarts -> random restarts
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