Artificial Intelligence Nanodegree
Introductory Project: Diagonal Sudoku Solver
Question 1 (Naked Twins)
Q: How do we use constraint propagation to solve the naked twins problem?
A: We apply the naked_twins() strategy each time we reduce a puzzle. This loops over each unit in the sudoku. We first find the naked twins (values and boxes); this is represented by the twin_values dict. For each naked twin we find their peers and remove the two values from their possibilities.
Question 2 (Diagonal Sudoku)
Q: How do we use constraint propagation to solve the diagonal sudoku problem?
A: Since our reduction strategies (naked twins, only choice, eliminate) are written using unitlist, all we have to do is add the diagonal units to this list.
Install
This project requires Python 3.
We recommend students install Anaconda, a pre-packaged Python distribution that contains all of the necessary libraries and software for this project. Please try using the environment we provided in the Anaconda lesson of the Nanodegree.
Optional: Pygame
Optionally, you can also install pygame if you want to see your visualization. If you've followed our instructions for setting up our conda environment, you should be all set.
If not, please see how to download pygame here.
Code
solution.py- Fill in the required functions in this file to complete the project.test_solution.py- You can test your solution by runningpython -m unittest.PySudoku.py- This is code for visualizing your solution.visualize.py- This is code for visualizing your solution.
Visualizing
To visualize your solution, please only assign values to the values_dict using the assign_value function provided in solution.py
Submission
Before submitting your solution to a reviewer, you are required to submit your project to Udacity's Project Assistant, which will provide some initial feedback.
The setup is simple. If you have not installed the client tool already, then you may do so with the command pip install udacity-pa.
To submit your code to the project assistant, run udacity submit from within the top-level directory of this project. You will be prompted for a username and password. If you login using google or facebook, visit this link for alternate login instructions.
This process will create a zipfile in your top-level directory named sudoku-.zip. This is the file that you should submit to the Udacity reviews system.