From: <由 Microsoft Internet Explorer 5 保存> Subject: 433-303 Artificial Intelligence Project 1 Date: Tue, 10 Aug 2004 22:43:34 +1000 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_000B_01C47F2B.77ADD9E0"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_000B_01C47F2B.77ADD9E0 Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.cs.mu.oz.au/303/project/projA-2004.html 433-303 Artificial Intelligence Project 1

433-303 Artificial Intelligence

Project - Part A

Last updated 3 August 2004

Task

The aim of this part of the project is to design and = implement an=20 algorithm for state space search in Prolog. This state space search = algorithm=20 can be used to evaluate whether a given board state represents a win for = the=20 join player. =20

Specification

Before you read this specification, please ensure = that you=20 have read the "Rules of=20 the Game".

In the pipeline game, the join player wins if = there is a=20 path from the refinery to the port along the trenches that have been = "joined"=20 using pipelines. In order to determine whether there is a connected path = through=20 the joined trenches, we can use state space search to search for a path. = Your=20 task is to implement a path search function through a given list of = joined=20 trenches.

You are required to implement a Prolog function

pathsearch(M, = N,=20 Role, Links, Route)

where

M and = N specify the = dimensions of the=20 board, as defined in the "Rules of the Game";
Role is the player for = whom we=20 are testing;
Links = is=20 the list of trenches which will be used as the basis for the path = search;=20 and
Route is = the output=20 parameter, which is the list of nodes in the path if a path exists, or = the=20 empty list [ ] if no path exists.

In general, pathsearch can be used = to test=20 whether either player has won. If Role is set to join, and Links contains the = trenches that=20 have been joined, then the join player has won if a path exists among = the joined=20 trenches given in Links. In=20 contrast, if Role = is set to=20 cut, and Links contains all the = trenches=20 that have not been cut, then the cut player has won if no = path=20 exists among the trenches given in Links.

To = simplify the=20 submission for Part A, you can make the following assumptions in your=20 implementation of pathsearch:

assume M=20 and N have the=20 value 4=20
assume Role = has the=20 value join =

These simplifications have been made since Part A is only = meant to be=20 a progress submission. In Part B you will need to implement a version of = pathsearch that relaxes = these=20 assumptions, so that you can write a complete game playing agent. But = you don't=20 have to worry about that for Part A.

Consider the following = example board=20 configuration, showing the joined and cut trenches.

3D""=20

For this = example,=20 your function would be called using the following parameter values:

pathsearch(4, = 4,=20 join, [(0,0,4,1), (4,1,4,2), (4,2,3,2), (3,2,3,3), (3,3,0,4)],=20 Route)

The return value of Route=20 for this example would be [(0,0), (4,1), (4,2), (3,2), = (3,3),=20 (0,4)].

In contrast, consider the following example board=20 configuration, showing the joined and cut trenches.

3D""=20

For this = example,=20 your function would be called using the following parameter values:

pathsearch(4, = 4,=20 join, [(0,0,4,1), (3,2,4,2), (4,2,4,3), (3,2,3,3), (3,3,0,4), = (1,2,1,3)],=20 Route)

Since there is no possible route from the refinery to the port in = this=20 example, the return value of Route=20 for this example would be the empty list [ ].

Submission

Your program must be written in Prolog. Your = implementation=20 will be tested using the swiprolog interpreter on the CSSE=20 machines. Useful information about Prolog and swiprolog can = be=20 found on the subject web page. If you are developing your implementation = on a=20 non-CSSE machine or using a different interpreter, it is your = responsibility to=20 make sure it runs correctly using swiprolog on the CSSE = machines.=20

Your submission will consist of one file, called pathsearch.pl. Your = submitted file=20 will be compiled along with the test program testsearch.pl, which = will include=20 the test data and call your pathsearch function. The = testsearch.pl test = program is=20 available here.=20 An example test data file testlinks.pl is = available here. This = test data=20 file is included automatically by the test program testsearch.pl. Do not submit testsearch.pl nor the = test data=20 file.

When you have submitted your program, it will be compiled = with=20 testsearch.pl and = some test=20 data, and then tested using an automated testing script. The automated = test=20 script assumes that the only output is generated by the testsearch.pl test = program. In=20 order for the automated testing to work, you should take note of the = following=20 requirements:

If you can find a path, the path must be returned as list of = nodes, with=20 the nodes ordered by the order they occur in the path, starting from = the=20 refinery (0, 0), and ending with the port (0,4).=20
If there is no path possible, you must return an empty list [ ].=20
You are not required to = find the=20 shortest path. However, your path must=20 not contain loops.
In order to ensure that your program does not interfere with the = automated=20 testing, your function should not attempt to write anything. In = particular,=20 you must not write the = keyword=20 "TESTING" to the standard output nor the standard error, since this = has a=20 special meaning to the automated test script. =20
You do not need to do = error=20 checking for links that cannot appear on the 4x4 board.=20
There will be a time limit of 20 seconds of real time and CPU time = (whichever comes first) on the execution of your program. =

Your=20 submission will be compiled as follows:

pl --goal=3Dmain -L15M -o = testsearch -c=20 testsearch.pl pathsearch.pl

Once submissions are open, you = should=20 submit by typing the following command on a CSSE machine:=20

submit 303 A pathsearch.pl

Verify your submission using the command

verify 303 A | more

You must submit by 5:00pm on Thursday 2 September 2004.

Late submissions will incur a penalty of two marks per day (or part = thereof).=20 If you cannot submit on time you should contact the head tutor Olivia=20 March (oliviacm at cs.mu.oz.au) via email (use the subject header=20 `303-projA-extension') at the soonestpossible opportunity (this = generally=20 means before the deadline). If you have a medical reason for = being=20 late, you will be asked to provide a medical certificate. We will then = assess=20 whether an extension is appropriate. Note that computer systems are = often=20 heavily loaded near project deadlines, and unexpected network or system = downtime=20 can occur. You should plan ahead to avoid leaving things to the last = minute,=20 when unexpected problems may occur. Generally, system downtime or = failure will=20 not be considered as grounds for an extension.

Late submission will be done using the command

submit 303 A.late pathsearch.pl

Do not use submit as a test = environment=20 for your program.

Assessment

Part A is intended as a progress submission for the = larger=20 project. The aim of Part A is to motivate you to get started on the = project.=20 Consequently, marks will be awarded for making a reasonable attempt at = the=20 specification, and for correct operation of your function. In Part A, we = will=20 not be marking the quality of your code, or the creativity of your = solution.=20 Those aspects will be addressed in Part B.

Part A will be marked = out of 6=20 points, and contribute 6% to your final mark for the subject. Of the 6 = points, 3=20 points will be for making a reasonable attempt, and the remaining 3 = points will=20 be for the result of automatic testing on a set of test cases. = Program=20 functionality will be tested by running it on a battery of test cases. = Your=20 program should include comments where appropriate. Note that even if you = don't=20 have a function that works correctly by the time of the deadline, you = should=20 submit anyway, since we will automatically award 3 points for a=20 reasonable attempt at the project.

Your program will be = tested=20 using an automated testing script. If your program does not compile and = run=20 correctly because you have not followed this specfication, you will lose = the 3=20 marks for the test cases. We do not have the resources to run = submissions by=20 hand if you make an error in the submission process.

Questions and answers pertaining to the project will be available in = the=20 Q&A web page here and=20 will be considered as part of the specification for the project. If you = have a=20 question that is not answered by the Q&A page, then it can be = directed to=20 the head tutor Olivia March (oliviacm at cs.mu.oz.au), or you can use = the cs.303=20 newsgroup for general discussion with other students.



As a starting point, you may want to look at an example of a general =
search=20
solution sampleAstar.pl=
 for=20
the Missionaries and Cannibals problem (which will be discussed in Week =
3's=20
tutorial). You may use this as a guide. However, it is provided with no=20
guarantees, and will need modification for this project.

This is an individual project. Group submissions will not be allowed. =
You are=20
encouraged to discuss ideas with your fellow students, but your program =
should=20
be entirely your own work. Automated similarity checking software will =
be used=20
to compare all submissions with each other. It is not acceptable to =
share code,=20
nor to use the code of someone else. If you program is found to be =
suspiciously=20
similar to someone else's, you may be subject to investigation and, if=20
necessary, punitive action. Please refer to Student Manual Volume A if =
you need=20
further clarification on this point. 




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