Stage Puzzle Manhattan

With using packages from the textbook, this program solves a StagePuzzle with misplaced tile, manhattan distance, and the max of two heuristics. The stage puzzle is randomized in each run and the three heuristic methods to solve the problem is timed separately.

Installation

Clone the repository

git clone https://github.com/Tooo/Stage-Puzzle-Manhattan.git

Download search.py and utils.py from Artificial Intelligence: A Modern Approach and insert them into the folder
Aimacode/aima-python
Run the program with Python 3

python main.py

StagePuzzle

StagePuzzle is a modified EightPuzzle with a similiar goal. From a randomized StagePuzzle, the program must solved the puzzle using heuristics. Below is an randomized example of a StagePuzzle.

  5 1
9 6 2 4
8 * 7 3

In each step, you can move neighbouring tiles into the blank tile. The program must solve the puzzle by getting to the Final State (below).

  1 2
3 4 5 6
7 8 9 *

Heuristics

Misplaced Tile Heuristic

In misplaced tile heuristic, it is assumed that any tile can move into any position. The heuristic will try to move each tile into the final positions. Therefore, h(n) is the number of misplaced tiles.

Manhattan Distance Heuristic

In manhattan distance heuristic, it is assumed tiles can be overlap. Each tile must be move into the final position independently. Therefore, h(n) is sum of vertical and horizontal displacement for each tile.

Max of Two Heuristic

Both misplaced tile and manhattan distance is calculated and the max of the two are used.

Sample Runs

Run 1

  7 2
0 3 9 4 
8 1 5 6

	Total running time	Solution length	Removed frontier nodes
Misplaced tile heuristic	277.4s	14,775	34,347
Manhattan distance herusitic	10.2s	3,079	6,246
Max of two heuristics	10.3s	3,079	6,246

Run 2

  1 0
7 8 5 4 
9 2 6 3

	Total running time	Solution length	Removed frontier nodes
Misplaced tile heuristic	149.4s	10,116	22,435
Manhattan distance herusitic	5.4s	4,158	2,132
Max of two heuristics	6.0s	4,158	2,132

References

Artificial Intelligence: A Modern Approach

Artificial Intelligence: Foundations of Computational Agents, 2nd Edition

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