Lecture 8 Randomized Search Algorithms Part I: Backtrack Search

10/18/01


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Table of Contents

Lecture 8 Randomized Search Algorithms Part I: Backtrack Search

Coming Up…

Variable and Value Selection

Inference in CSP’s: So Far…

N-queens Demo

Question of the Day

Problem Domain: ?Chess

Fiber Optic Networks

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Timetabling

Paramedic Crew Assignment (Austin, Texas)

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Quasigroup Completion Problem A Framework for Studying Search

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QCP as a CSP

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Complexity of Quasigroup Completion

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These results for the QCP - a structured domain, nicely complement previous results on phase transition and computational complexity for random instances such as SAT, Graph Coloring, etc.

Constrainedness

Effect of Constrainedness

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Distributions of Randomized Backtrack Search

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Heavy-Tailed Distributions

Decay of Distributions

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How to Check for “Heavy Tails”?

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Consequence for algorithm design:

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Restarts

Tuning Cutoff

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Eliminating Heavy Tails

Deterministic Search

Restarts

Summary

Author: Henry Kautz

Email: kautz@cs.washington.edu

Home Page: www.cs.washington.edu/homes/kautz

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