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Assignment 3: General Games - Part 2
Core Body of Knowledge classification (http://tinyurl.com/acscbok): Abstraction
(5), Design (5), Teamwork concepts & issues (3), Data (5), Programming (5), Systems
development (3)
Due date: Week 12, Weight: 10 % of the course
1 Overview
Assignments should be done in groups consisting of five to six (5–6) students. Please use
the Groups feature in myUni. If you have problems finding a group use the Discussions
forum to search for group partners.
Each student has to take major responsibility for one of the exercises and collaborate
with the team members on the remaining exercises. Each exercise needs 1–2 students
taking major responsibility. For Exercise 4, you should have 2–3 students taking major
responsibility. The group has to make sure that the workload is evenly distributed.
2 Assignment
This assignment uses the General Video Game AI framework (GVGAI). You can only use
Java for this assignment.
Assignment 3 requires that you compute and test sequences of inputs to be played for each
game level. We only consider the Single Player Planning Track in this assignment.
For a quick start, take a look at src/tracks/singlePlayer/Test.java for an example
on how to use the framework.
In this assignment, you have to consider the following 4 games: Bomber, Boulderchase,
Chase, Garbagecollector. These games are deterministic, meaning performing
a sequence of inputs results in the same outcome every time. Note that each game
includes 5 levels (from “lvl0” to “lvl4”), so you will be looking at 20 game levels in total.
Since a sequence of inputs can be simulated using the advance function (see “One Step
Look-Ahead” controller) without having a game instance running, there will be no wallclock
time constraint. Such a sequence is to be applied to the initial game state, and its
score is measured after applying the last input, or when a terminal game state (win or
lose) is reached during the simulation, whichever comes first. The score should be taken
directly from the game state without modification from heuristics.
For this assignment, we consider a call to the advance function to be the time unit for
the benchmark, as it is the bottleneck operation in the optimisation. Note that if the
simulation of a given sequence reaches a terminal game state, subsequent steps will not
change the game state, or incur computational cost. This means different sequences can
have different evaluation costs, which must be accounted for in the termination criteria
of your algorithms.
1
The University of Adelaide
Exercise 1 Team work: who has done what? (zero points)
Just like in Assignment 1, we’d like each team member to write one paragraph about
what he or she has contributed to this assignment. We will not mark this, and it will not
have any effect on the marking of the other exercises. You might now ask, “why do this
then?” – well, through this no-stakes approach, we’d like to encourage self-regulation
within the group and cooperative learning. You can’t lose; you can only win.
Exercise 2 Single-objective inputs optimisation (20 points)
For this exercise, you have to evolve a sequence of input that maximises the score on a
given game level.

  1. Design an evolutionary algorithm to compute an input sequence maximising the
    score on a game level. Describe and justify its design in the report. It should make
    use of (and count the number of calls to) the advance function. You may use
    existing techniques if appropriate.
  2. Run the algorithm on each of the 20 game levels 10 times (or more) with 5 000 000
    calls to advance each time, and report for each game level the average and standard
    deviations of scores after 200 000, 1 000 000, 5 000 000 calls.
    Notes:
    • You may have to implement a method to obtain the initial game state. For a quick
    start, check the runOneGame function in ArcadeMachine.java. Note that the
    prepareGame function in Game.java may need to be run to have the game state
    properly initialised.
    • You can replay an input sequence with the replayGame function in ArcadeMachine.java,
    given that the sequence is stored in a certain format. Alternatively,
    you can implement your own replaying function. One the other hand, for efficiency,
    your algorithm should use the game state object directly.
    • If the 200 000th call occurs during, and not at the end of, an iteration of the
    algorithm, record the score achieved in the previous iteration. The same applies
    to 1 000 000th, 5 000 000th calls. For population-based algorithms, “one iteration”
    refers to “one generation” (i.e. one iteration of the generational loop).
    • If the final sequence is stored after each run, remove redundant inputs after the one
    where the terminal state is reached (if applicable).
    Exercise 3 Multi-objective inputs optimisation (30 points)
    This exercise extends Exercise 2 by considering an additional objective: minimising sequence’s
    length. Here, “length” refers to the effective part of the sequence, i.e. not
    counting inputs after terminal state (if reachable).
    2
    The University of Adelaide
  3. Design a bi-objective evolutionary algorithm to compute input sequences maximising
    the score on a game level, while being as short as possible. Describe and justify
    its design in the report. It should make use of (and count the number of calls to)
    the advance function. You may use existing techniques if appropriate.
  4. Run the algorithm on each of the 20 game levels 10 times (or more) within 1 000 000
    calls to advance each time, and report for each game level the averages and standard
    deviations of hypervolumes after 200 000, 1 000 000, 5 000 000 calls.
    Notes:
    • The same convention in Exercise 2 applies regarding the how scores are recorded
    and how sequences should be stored.
    • You can specify your own reference points to compute the hypervolumes. While
    different reference points may be used for different games, the same point must be
    used for all levels within a game. Include the reference points you choose in the
    report.
    • The choice of hyperparameters (e.g. population size) is up to you. Include these in
    the report.
    Exercise 4 Level design (50 points)
    In this exercise, you are required to evolve levels of a game. You are to choose one existing
    game for this task, and it does not have to be among the 4 games mentioned above.
    • Briefly describe the game, including sprite interaction rules, winning and losing
    conditions, and available inputs.
    • Decide on at least 2 objectives to optimise. Additionally, define the constraints
    on the game levels as appropriate. For instance, some games require the levels be
    surrounded by wall sprites.
    • Design a multi-objective evolutionary algorithm to evolve levels optimising the objectives.
    Describe and justify its design in the report.
    • Run the algorithm 10 times (or more), and report the averages and standard deviations
    of hypervolumes of the final outcomes.
    • Include screenshots of the initial game screens from 10 (or more) final levels in the
    report, along with their respective objective values. These levels should represent
    the Pareto front well. Discuss the results in the context of the chosen objectives.
    Notes:
    • The chosen objectives should be justifiable, and they need to conflict with each
    other to some degree to make for interesting trade-offs.
    • For this exercise, you may choose to run with any parameter setting, including
    run-time budget. Describe the chosen setting in the report.
    • To take the screenshot of the first frame of the game, you can try running the game
    with a human player.
    3
    The University of Adelaide
  5. Procedure for handing in the assignment
    Work should be handed in using the course website. The submission must include:
    • pdf file of your solutions for theoretical assignments
    • all source files (if you created any): if your code does not compile or if it is not
    sufficiently well documented, we will cap the code-related marks at 50%
    • descriptions and additional files as required in the statement of the exercises
    • a file name README.txt that contains instructions to run the code (if any), the
    names, student numbers, and email addresses of the group members
    • for each group, there should be only 1 submission
    Failure to meet all requirements of the ’General procedure for handing in
    the assignment’ will lead to a reduction by twenty (20) marks.
    Note: there will be a progress presentation session for this assignment. This is a big
    opportunity for you to get feedback on your progress, and to make last adjustments for
    the final submission. In these progress presentations, we are expecting each group to
    briefly outline their achievements. You should not repeat what the assignment is about –
    we all should know this by then. Outline your approach, your results (screenshots), and
    tell us about your challenges – maybe we can help you right away.
    The following link contains general information that can be helpful:
    • Feedback that we have given in the past:

    WX:codehelp

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