1 Introduction
Auction Games
CS404 Agent-based Systems Coursework
Imagine an auction of paintings by four famous artists: Picasso, Van Gogh, Rembrandt and Da Vinci. In an auction room the auctioneer presents each piece to be sold, and all bidders then write their bids for the item on a secret sealed note that is handed to the auctioneer. The auctioneer then declares the highest bidder the winner, takes a payment (equal to their bid or to that of the second-highest bidder, depending on the auction), and starts the next round with a new item. If there is a target collection of paintings to buy, the first bidder to buy this bundle of goods terminates the auction and wins. Otherwise, the auction continues until either everyone runs out of money or there are no more items to sell. If there is no target bundle, the bidder with the paintings of the highest total value is the winner.
The objective is to implement strategies for a Python 3 bidding bot that will participate in such an auction.
2 The Auction
The auction runs in the following way. An Auctioneer initialises a room full of bots, then sets up the auction. This involves giving each bot the same budget to spend, setting the sequence of items to be sold, and setting the rules of the auction such as how the overall winner of the game will be decided.
The Auctioneer will then announce an item type to be bid upon, and ask the bots for bids. Your Bot will use the information that the Auctioneer gives it to determine an amount to bid. Once all bots have bid, the Auctioneer will declare the highest bidder the winner, who will then be charged (but not necessarily the amount they bid, see below) and receives the item. If the bids draw, then the winner is chosen at random from the drawn bidders.
For each game, there is at most one winner. The auction will continue until either there are no more items to sell or if there is a set winning condition, e.g., a bidder managed to acquire the target collection of artists’ paintings needed, in which case they are declared the winner. If there is no target collection as a winning condition then the auction will end once all the paintings are sold, and the bidder who ends with the highest total value of items is the winner.
Note that, however, whilst the highest bidder will always win, the auction may be set up so the highest bidder does not pay their own bid. It can be set up so that the highest bidder is only charged the second-highest bid (see winner pays).
You will write your strategies in your Bot. Your Bot will be tested in a series of different auctions against Bots of varying difficulty and number. Finally, your Bots will be tested against each other in a tournament.
There are two types of games that will be played:
• Value Game:
Highest total value at the end wins, the highest bidder pays the second-highest bid. Picasso is
worth 4, Van Gogh worth 6, Rembrandt worth 8 and Da Vinci worth 12
• Collection Game:
First to collect a given bundle of painting types, the highest bidder pays their own bid. For
example, the collection bundle could be 3 paintings of any artist and 1 of any other artist.
Note that for all games in this tournament, the auction size (number of paintings up for auction) will be 200 and the starting budget for every bidder is 1001.
CS404 Agent Based Systems Coursework
3 Implementation
Provided to you are two main Python 3 files to run the auctions: auctioneer.py and arena.py. We also provide you with some example bots in the bots folder, random bot.py, flat bot 10.py and u1234321.py.
3.1 auctioneer.py
auctioneer.py contains the definition for the Auctioneer class, which sets up and runs the auction. We will use this exact same file while marking your bots, so DO NOT CHANGE ANY OF THE CODE IN THIS FILE.
It has the following arguments:
• game type(string): Either “value” or “collection” for the 2 game types. Value games are won by the bot with the highest value of paintings after all rounds. Collection games are won when a bot manages to collect a full set of paintings as specified in the target collection.
• room(list of modules): A “room” is a list of bots that will play the auction. The bots are module objects. There is an example of how to import them at the top of the auctioneer.py file, and how to pass them to the Auctioneer as a list at the bottom of the auctioneer.py file. There are also examples in the arena.py file.
• painting order(list of strings): A list of the sequence of painting types that will be auctioned in each of the rounds. If this is set to None then a random order will be used.
• target collection(list of integers): For collection type games, the winning bot is the first to win a collection of paintings. This is given as a list. For example, [4,2] means that the winner is the first bot to collect 4 paintings of one artist and 2 of another artist. The specific artist is not important. So 4 Da Vincis and 2 Rembrandts would win, as would 4 Picassos and 2 Van Goghs. Note: the strategies will be evaluated against a target collection of [4,2].
• slowdown(float): How long to wait at each round of the auction. If you set this to zero the auctions will run fast.
• verbose(boolean): Whether the auctioneer prints updates to the terminal or not.
• output csv file(string): The auctioneer automatically logs the result of every round in an auction. This
defaults to ’data/auctioneer log.csv’, but you can specify a different filename.
When the auctioneer is initialised it will automatically set up the auction and all the bots in the room with the
initialise bots() method.
The method run auction() will run the auction until it is completed.
It is not necessary to know how the Auctioneer class works to do well on the coursework. But if you are interested there are more details in the README.md file.
3.2 arena.py
The arena.py file is provided as a convenient way to run auctions. This includes some methods that show examples of how to run auctions. This is given to you as an example, so please feel free to change any of the code here and experiment.
You might want to run an auction slowly, with a full print out to the terminal of the auction’s progress, as shown in run basic auction(). This will be useful to see how your bot is performing live. Or you might want to run lots of auctions quickly, as shown in run lots of auctions().
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CS404 Agent Based Systems Coursework
3.3 bots
In the bots folder we included a few bots for you to practice with. We have given you 3 bots. bots/u1234321.py is a good starting point for your own bot, with everything commented clearly. bots/flat bot 10.py and bots/random bot.py are example bots that should be easy to beat.
3.4 bots/u1234321.py
u1234321.py is an example bot that you can use as a starting point to write your own bot.
Each bot is a class, with two main methods, get bid game type collection() and get bid game type value(), that allow you to make bids on the collection and value game types. it is in these functions that you should implement your strategies for the two game types. The comments on the methods explain what each argument is. Currently, the strategies both just return a random integer between 0 and the amount of budget that your bot has left.
Your bot will be initialised at the start of the auction, and then will play until the auction finishes. This means that your bot can hold internal state variables during the auction, which may be useful for some strategies. You can add these variables, or any other code, in the init () method, if you want to. Please change the self.name=“1234321” to your own ID number.
Feel free to add any extra methods that you might need, but be careful that the two main methods keep the same input variables and return integer bids without crashing.
If your bot crashes then your bid will be set to zero. If your bot returns a float then this will be rounded down to an integer. If your bot bids more than their budget then their bid will be set to zero. If your bot takes longer than 5 seconds to return a bid, then again your bid will be set to zero.
3.5 bots/random bot.py and bots/flat bot 10.py
We’ve included some simple bots for you to play against.
• random bot.py: Bids a random integer between 0 and the bot’s remaining budget.
• flat bot 10.py: Bids 10 on everything.
You can add your own. You can see how to import bots and play against them in the arena.py file.
4 Submission
Your coursework submission will consist of a single compressed file (either .zip or .tgz) containing your bot in a python file and your writeup as a pdf. The coursework file should be submitted through Tabula.
4.1 Your Bot
Please save this as u
u1867321.py
class Bot(object):
def __init__(self):
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CS404 Agent Based Systems Coursework
self.name = 1867321
….
You should also include the methods for playing each game type. You can use bots/u1234321.py as a starting point.
Here is an example of how your bot will be imported and run:
from auctioneer import Auctioneer
from bots import random_bot
from bots import u1867321 # Your id number here
room = [random_bot, u1867321]
value_game = Auctioneer(room=room, game_type=”value”, slowdown=0)
winner = value_game.run_auction()
print(“The winner is “, winner)
Please make sure that your bot will run in this way, replacing the id number here with your own id number. If you run the above script you should see the auction run very fast and then print out “The winner is [1867321]”, with your id number shown (if your strategy can beat a random bot).
You can test that your bot runs correctly by using the functions provided in the arena.py file. If your bot crashes you will lose marks!
4.2 Your Writeup
Please save this as
5 Evaluation
The coursework is worth 50% of the module credit. Its marking scheme is structured as follows:
• 30% Strategy performance for the ‘Value Game’ (against various bots including other submissions).
• 30% Strategy performance for the ‘Collection Game’ (against various bots including other submissions). • 40% Quality of the written report (how well you explain and analyse your strategies).
For each game type, your bot will be tested in a range of different auction “rooms”, made up of bots of different difficulties, in different room sizes and compositions. For example, you will be tested in a room against one random bot. You will also be tested in a room with a mix of up to 10 bots with different strategies. For collection games, you will be tested against different target collections and different painting orders. Your bot’s performance in this set of rooms will form the majority of your mark for strategy performance.
We will also play the student bots against each other, and this will contribute to your mark for strategy performance.
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CS404 Agent Based Systems Coursework
6 Cheating/Plagiarism
This coursework is an individual piece of work. All submissions will be put through plagiarism detection software which compares against a number of sources, including other submissions for CS404, submissions at other universities, web sources, conference papers, journals and books. Please see the student handbook for more information, or ask if you need guidance.
In addition, please note that any attempt to access other bots or modify the auctioneer class will be considered cheating and sanctioned accordingly.
Acknowledgements
The code was developed by Charlie Pilgrim (charlie.pilgrim@warwick.ac.uk), Department of Mathematics, University of Warwick. A previous version of the coursework, from which this takes inspiration, was written by Alexander Carver, Department of Computing, Imperial College London. Further precious input for the coursework came from Charlotte Roman, Department of Mathematics, University of Warwick.
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