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COMP90054 AI Planning for Autonomy Assignment 1 - Search

You must read fully and carefully the assignment specification and instructions detailed in this file. You are NOT to modify this file in any way.

● Course: COMP90054 AI Planning for Autonomy @ Semester 2, 2021

● Submission method: via git tagging (see Submission Instructions below for instructions)

The aim of this assignment is to get you acquainted with AI search techniques and how to derive heuristics in Pacman, as well as to understand the Python-based Pacman infrastructure.

Your task

You must build and submit your solution using the sample code we provide you in this repository, which is different from the original UC Berlkley code base. If you want to provide a report with your submission (e.g., reflections, acknowledgments, etc.), please do so in file REPORT.md.

● Please remember to complete the STUDENT.md file with your individual submission details (so we can identify you when it comes time to submit).

● You should only work and modify files search.py and searchAgents.py in doing your solution. Do not change the other Python files in this distribution.

● Your code must run error-free on Python 3.6. Staff will not debug/fix any code. Using a different version will risk your program not running with the Pacman infrastructure or autograder and may risk losing (all) marks. You can install Python 3.6 from the official site, or set up a Conda environment or an environment with PIP+virtualenv.

● Your code must not have carry any personal information, like your student number or your name. That info should go in the STUDENT.md file, as per instructions above. If you use an IDE that inserts your name, student number, or username, you should disable that.

● Assignment 1 FAQ is available to answer common questions you might have about the Assignment 1 on ED at https://edstem.org/au/courses/6410/discussion/543003

● Getting started on GitHub - this video explains how to clone, git add, commit and push while developing your solution for this assignment: https://www.loom.com/share/ae7e93ab8bec40be96b638c49081e3d9

Practice Task (0 marks)

To familiarize 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.

You should code your implementations only at the locations in the template code indicated by ***YOUR CODE HERE*** in files search.py and searchAgents.py, please do not change code at any other locations or in any other files.

Part 1 (4 marks)

Implement the Enforced Hill Climbing algorithm discussed in lectures, using Manhattan Distance as the heuristic, by inserting your code into the template indicated by comment ***YOUR CODE HERE FOR TASK 1*** , you can view the location at this link: search.py#L129.

Note that you don't have to implement Manhattan Distance, as this has already been implemented for you in the template code, although you will need to call the heuristic from inside your search. You should be able to test the algorithm using the following command:

Other layouts are available in the layouts directory, and you can easily create you own!

Part 2 (4 marks)

This part involves solving a more complicated problem. Just like in Q7 of the Berkerley Pacman framework, you will be required to create an agent that will eat all of the food (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 capsuleProblemHeuristic . You may choose to implement other helper classes/functions. You should insert your code into the template indicated by the comments ***YOUR CODE HERE FOR TASK 2*** , you can view the locations at these links: search.py#L117 and 4 positions in searchAgents.py.

You should be able to test your program by running the following code (in one line):

An agent that eats the capsule then proceeds to eat all of the food on the maze will receive 2 marks. The remaining 2 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 A* algorithm, however, the number of node expansions required for each grade will vary.

Indicative marks are shown below for node expansions on the testing files simple_test.test and corner_tiny_corner.test which are used by the autograder for checking your submission. Note that we will test your submission on different layouts, however this will give you a good guide for comparing the expected performance of your solution:

Part 3 (2 marks) - Challenge Question (more difficult)

Jump Point Search (JPS) is a very effective search for a grid problem with sparse number of obstacles. The original JPS (which can be found here) is designed with the capability of moving in diagonal.

Implement the orthogonal version of JPS, using Manhattan Distance as the heuristic, by inserting your code into the template indicated by comment ***YOUR CODE HERE FOR TASK 3*** , you can view the location at this link: search.py#L140.

Note that you don't have to implement Manhattan Distance, as this has already been implemented for you in the template code, although you will need to call the heuristic from inside your search. You should be able to test the algorithm using the following command:

Other layouts are available in the layouts directory, and you can easily create you own!

hints:

● The JPS algorithm in the paper describes a grid that most of the cells have 8 neighbors and agent can move in diagonal. In order to convert it to in orthogonal only. You will have to replace Line 8-11 in Algorithm 2 with your own ideas to check future forced neighbors in vertical (which potential make the current node a jump point).

To help have a better understanding of the orthogonal JPS, we have created a video to explain how it works.

Marking criteria

Marks are allocated according to the task breakdown listed above, based on how many of our tests the algorithms pass. No marks will be given for code formatting, etc. Observe that while the automarker is a useful indication of your performance, it may not represent the ultimate mark. We reserve the right to run more tests, inspect your code and repo manually, and arrange for a face-to-face meeting for a discussion and demo of your solution if needed. You must follow good SE practices, including good use of git during your development such as:

● Commit early, commit often: single or few commits with all the solution or big chucks of it, is not good practice.

● Use meaningful commit messages: as a comment in your code, the message should clearly summarize what the commit is about. Messages like "fix", "work", "commit", "changes" are poor and do not help us understand what was done.

● Use atomic commits: avoid commits doing many things; let alone one commit solving many questions of the project. Each commit should be about one (little but interesting) thing.

Checking your submission

Run the following command to run sanity checks using our test files:

It is important that you are able to run the autograder and have these tests pass, otherwise, our marking scripts will NOT work on your submission.

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.

Submission Instructions

This repository serves as a start code for you to carry out your solution for Project 1 - Search from the set of UC Pacman Projects and the marked questions.

To submit your assignment you must complete the following three steps:

1. Complete the STUDENT.md file with your details of the submission.

2. Check that your solution runs on Python 3.6 and that your source code does not include personal information, like your student number or name.

3. Tag the commit version you want to be graded with tag submission .

○ The commit and tagging should be dated before the deadline.

○ Note that a tag is NOT a branch, so do not just create a branch called "submission" as that will not amount to tagging.

4. Fill the Assignment 1 Certification Form.

○ Non-certified submissions will not be marked and will attract zero marks.

From this repository, we will copy only the files: search.py and searchAgents.py. Please do not change any other file as part of your solution, or it will not run. Breaking these instructions breaks our marking scripts, delays marks being returned, and more importantly, gives us a headache. Submissions not compatible with the instructions in this document will attract zero marks and do not warrant a re-submission. Staff will not debug or fix your submission.

Please view the following to learn how to Tag your commit version you want to be graded:

How to create a Tag using the Command Line: https://www.loom.com/share/17ec72b954454bc89bbe1dbb0bd2874f

Another way to create a Tag using the User Interface: https://www.loom.com/share/3cd39e97919e4b688d9841613aba6973

Important information

Corrections: From time to time, students or staff find errors (e.g., typos, unclear instructions, etc.) in the assignment specification. In that case, corrected version of this file will be produced, announced, and distributed for you to commit and push into your repository. Because of that, you are NOT to modify this file in any way to avoid conflicts.

Late submissions & extensions: A penalty of 10% of the maximum mark per day will apply to late assignments up to a maximum of five days, and 100% penalty thereafter. Extensions will only be permitted in exceptional circumstances; refer to this question in the course FAQs.

About this repo: You must ALWAYS keep your fork private and never share it with anybody in or outside the course, except your teammates, even after the course is completed. You are not allowed to make another repository copy outside the provided GitHub Classroom without the written permission of the teaching staff. Please respect the authors request:

Academic Dishonesty: This is an advanced course, so we expect full professionalism and ethical conduct. Plagiarism is a serious issue. Please don't let us down and risk our trust. The staff take academic misconduct very seriously. Sophisticated plagiarism detection software (e.g., Codequiry, Turinitin, etc.) will be used to check your code against other submissions in the class as well as resources available on the web for logical redundancy. These systems are really smart, so just do not risk it and keep professional. We trust you all to submit your own work only; please don't let us down. If you do, we will pursue the strongest consequences available to us according to the University Academic Integrity policy. For more information on this see file Academic Integrity.

We are here to help!: We are here to help you! But we don't know you need help unless you tell us. We expect reasonable effort from you side, but if you get stuck or have doubts, please seek help. We will ran labs to support these projects, so use them! While you have to be careful to not post spoilers in the forum, you can always ask general questions about the techniques that are required to solve the projects. If in doubt whether a questions is appropriate, post a Private post to the instructors.

Silence Policy: A silence policy will take effect 48 hours before this assignment is due. This means that no question about this assignment will be answered, whether it is asked on the newsgroup, by email, or in person. Use the last 48 hours to wrap up and finish your project quietly as well as possible if you have not done so already. Remember it is not mandatory to do all perfect, try to cover as much as possible. By having some silence we reduce anxiety, last minute mistakes, and unreasonable expectations on others.

Please remember to follow all the submission steps as per assignment specification.

COMP90054 Code of Honour

We expect every UoM student taking this course to adhere to it Code of Honour under which every learner-student should:

● Submit their own original work.

● Do not share answers with others.

● Report suspected violations.

● Engage in any other activities that will dishonestly improve their results or dishonestly improve or damage the results of others.

Unethical behaviour is extremely serious and consequences are painful for everyone. We expect enrolled students/learners to take full ownership of your work and respect the work of teachers and other students.

I hope you enjoy the assignment and learn from it, and if you still have doubts about the assignment and/or this specification do not hesitate asking in the ED discussion Forum and we will try to address it as quickly as we can!

GOOD LUCK and HAPPY PACMAN!