Artificial Intelligence: A Modern Approach
Artificial Intelligence: A Modern Approach
3rd Edition
ISBN: 9780136042594
Author: Stuart Russell, Peter Norvig
Publisher: Prentice Hall
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Chapter 4, Problem 12E

Explanation of Solution

a.

Viewing online search problem as offline search problem:

  • The online search is equivalent to the offline search in belief state space. In that each and every action in a belief state can have multiple successor belief states. For each percept the agent is able to observe after the action.
  • A successor belief-state is created by taking the previous belief-state, itself a collection of states, replacing each state in this belief-state with successor state under the action, and eliminating all successor states that are incompatible with the definition.
  • This is similar to the AND-OR search and can be used to solve this search problem.
  • The initial belief state has 210 = 1024 states in it, and as the user knows whether the two edges have wall or not but nothing more...

Explanation of Solution

b.

Justification:

Assume that the external walls ...

Explanation of Solution

c.

Branches of a contingency plan:

  • Consider the above figure, the initial null action leads to four possible belief states, as shown in the figure. From each belief state, the agent chooses a single action which can lead to up to 8 belief states (on entering the middle square)...

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