辅导案例-COMP90054
The University of Melbourne
School of Computing and Information Systems
COMP90054 AI Planning for Autonomy
Project 1, 2019
Deadline: Monday 2 September 18:00
This project counts towards 10% of the marks for this subject.
This project must be done individually.
Aims
The aims of this project are to improve your understanding of the various search algorithms
and to experience how to derive heuristics, using the Berkely Pac Man framework.
https://inst.eecs.berkeley.edu/~cs188/fa18/project1.html
Your task
Your tasks relate to the assignment at https://inst.eecs.berkeley.edu/~cs188/fa18/
project1.html.
Practice Task (0 marks)
To familiarise yourself with basic search algorithms and the Pacman environment, it is a
good start to implement the tasks at https://inst.eecs.berkeley.edu/~cs188/fa18/
project1.html, especially the first four tasks; however, there is no requirement to do so.
Part 1 (2 marks)
Implement the Iterative Deepening Search algorithm discussed in lectures. You should be
able to test the algorithm using the following command:
python pacman.py -l mediumMaze -p SearchAgent -a fn=ids
Other layouts are available in the layouts directory, and you can easily create you own!
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Part 2 (2 marks)
Implement the Weighted A* algorithm discussed in lectures using W = 2. You may hardcode
this weight into your algorithm (that is, do not pass as a parameter).
You should be able to call your function using the fn=wastar parameter from the com-
mand line, i.e. you should be able to test the algorithm using the following command:
python pacman.py -l bigMaze -z .5 -p SearchAgent
-a fn=wastar,heuristic=manhattanHeuristic
Other layouts are available in the layouts directory, and you can easily create you own!
Part 3 (6 marks)
Now we wish to solve a more complicated problem. Just like in Q7 of the Berkerley Pac
Man framework, we woud like to create an agent that will eat all of the dots in a maze.
Before doing so, however, the agent must eat a Capsule that is present in the maze. Your
code should ensure that no food is eaten before the Capsule. You can assume that there is
always exactly one Capsule in the maze, and that there will always be at least one path from
Pacman’s starting point to the capsule that doesn’t pass through any food.
In order to implement this, you should create a new problem called CapsuleSearchProblem
and a new agent called CapsuleSearchAgent. You will also need to implement a suitable
foodHeuristic. You may choose to implement other helper classes/functions. You should
be able to test your program by running the following code:
python pacman.py -l capsuleSearch -p CapsuleSearchAgent
-a fn=wastar,prob=CapsuleSearchProblem,heuristic=foodHeuristic
An agent that eats the capsule then proceeds to eat all of the food on the maze will receive 3
marks. The remaining 3 marks will be based on the performance of your agent (i.e. number
of nodes expanded), as in Q7 of the Berkeley problem. Since you are using the Weighted A*
algorithm, however, the number of node expansions required for each grade will vary.
HINT: Think carefully about how you intend to structure your solution before starting
to implement it.
NOTE: You should not change any files other than search.py and searchAgents.py. You
should not import any additional libraries into your code. This risks being incompatible with
our marking scripts.
Marking criteria
This assignment is worth 10% of your overall grade for this subject. Marks are allocated
according to the breakdown listed above, based on how many of our tests the algorithms
pass. No marks will be given for code formatting, etc.
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Submission
The master branch on your repository will be cloned at the due date and time.
From this repository, we will copy only the files: search.py and searchAgents.py. Do
not change any other file as part of your solution, or it will not run. Breaking these instruc-
tions breaks our marking scripts, delays marks being returned, and more importantly, gives
us a headache.
Note: Submissions that fail to follow the above will be penalised.
Academic Misconduct
The University misconduct policy1 applies. Students are encouraged to discuss the assign-
ment topics, but all submitted work must represent the individuals understanding of the
topic. The subject staff take academic misconduct seriously. In the past, we have prosecuted
several students that have breached the university policy. Often this results in receiving 0
marks for the assessment, and in some cases, has resulted in failure of the subject.
Important: As part of marking, we run all submissions via a code similarity comparison
tool. These tools are quite sophisticated and are not easily fooled by attempts to make code
look different. In short, if you copy code from classmates or from online sources, you risk
facing academic misconduct charges.
But more importantly, the point of this assignment is to have you work through a series of
foundational search algorithms. Successfully completing this assignment will make the rest
of the subject, including other assessment, much smoother for you. If you cannot work out
solutions for this assignment, submitting another persons code will not help in the long run.
1See https://academichonesty.unimelb.edu.au/policy.html
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