August 2018
Intermediate to advanced
124 pages
2h 47m
English
Content preview from Hands-On Artificial Intelligence for Search
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Admissible
A good heuristic function should be admissible, which means that the heuristic function should have a value that is less than (or equal to) the true cost to reach the goal:
Figure 31
Let's suppose that node 1 is the root node and node 5 has the goal state, and we are currently computing the heuristic function for node 2; the following applies:
- d12 is the cost of the path from 1 to 2
- d24 is the cost of the path from node 2 to 4
- d45 is the cost from node 4 to 5
- d23 is the cost from node 2 to 3
- d35 is the cost from node 3 to 5
Then, in order for our function to be admissible, the following must be true:
- The heuristic function for ...
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