Informed search algorithms

Material

Outline

Review: Tree search

Best-first search

Romania with step costs in km

Greedy best-first search

Greedy best-first search example

Greedy best-first search example

Greedy best-first search example

Greedy best-first search example

Properties of greedy best-first search

A^* search

A^* search example

A^* search example

A^* search example

A^* search example

A^* search example

A^* search example

Admissible heuristics

Optimality of A^* (proof)

Optimality of A^* (proof)

Consistent heuristics

Optimality of A^*

Properties of A^*

Admissible heuristics

Admissible heuristics

Dominance

Relaxed problems

Local search algorithms

Example: n-queens

Hill-climbing search

Hill-climbing search

Hill-climbing search: 8-queens problem

Hill-climbing search: 8-queens problem

Simulated annealing search

Properties of simulated annealing search

Local Beam Search

Genetic algorithms

Genetic algorithms

Genetic algorithms

Online search and exploration

Competitive Ratio

Exploration problems

Hex!

Hex!

Assignment

Homework #1 - Hex