- (6 Nov) Exercise Sheet 2 out. Deadline is 14 Nov.
- (23 Oct) Exercise Sheet 1 out. Deadline is 7 Nov.
- (14 Oct) Since the Semester-kick-off Meeting will be held at 4:30pm on 16 Oct, our first lecture will start on 23 October, 2017.
|Lecturer:||Yun Kuen Cheung (You may call me Marco.)|
|Lectures:||Monday 4pm to 6pm, Room 021 in Building E1.4|
|Tutor:||Bhaskar Ray Chaudhury|
|Tutorials:||Alternating Tuesday 2pm to 4pm, Room 021 in Building E1.4|
|Prerequisites:||The following knowledge is assumed from enrolled students: |
|For more details about course logistics, syllabus, exercises and examinations, click here.|
Games and markets arise wherever there are two or more agents competing for selfish benefits. In their enormous applications, "agents" can refer to humans, animals, computers, bacterias or even molecules.
In the past 20 years, the algorithmic/computational aspects of game/market/auction theory have grown to become a popular topic in (theoretical) computer science, economics, operational research, dynamical system, and more. In this course, we will discuss the very core of this exciting new research direction.
For ambitious students who want to develop rigorous theoretical training related to this topic, I can suggest extra materials for reading and thinking.
This course is divided into three parts.
In the first part, we cover some basic concepts in games and markets, including Zero-sum Game and General-sum Game, Nash Equilibrium, Market Equilibrium, Correlated Equilibrium and Regret Minimization. Algorithms for finding such equilibria in will be presented.
Concerning equilibrium, one fundamental question is how good an equilibrium is. Prisoner Dilemma is a canonical example to show that Nash Equilibrium can be very bad. Efficiency measures and techniques, e.g. Price of Anarchy and Smoothness, will be covered.
In the second part, we address another fundamental question concerning equilibrium: how an equilibrium is reached. We will study a number of simple game/market dynamics, e.g. Tatonnement and Proportional Response Dynamic, aiming to explain how equilibrium can be reached in a highly distributed environment, in which individual agents can access very limited local information only. We will also look into an interesting special case of Linear Fisher/Exchange market, for which flow-type algorithms were developed.
In the third part, we focus on the prominent application of game theory in the digital era --- design of auction, or what we call the Mechanism Design, e.g. eBay, Google ad auction, spectrum auction. In the simplest setting, there is an auctioneer selling a number of items, and there are many agents who are interested in those items. Mechanism design concerns
- the design of communication protocols between auctioneer and agents
- design of efficient (poly-time, or even stricter time requirement due to practical applications) algorithms to decide the allocation of items which achieve good efficiency
- design of truthful mechanism which motivates agents not to be strategic on reporting their preferences
Our course will have some overlaps with the following materials. We will also provide self-contained lecture notes in this webpage.
Lecture notes will be updated shortly after each lecture. Exercise sheet is handed out every two weeks, and typically you are given one week time to finish; you are required to submit it just before the exercise session begins.
Below is a tentative schedule on the topics to be discussed. They are subject to change.
|Date||Lecture Topics||Exercise Sheet||Remarks||Remarks / Suggested Readings|
|N/A||Course Logistics --- CLICK HERE|
|23 Oct, 2017|| ||Exercise Sheet 1 --- CLICK HERE||Quanta Magazine article: In Game Theory, No Clear Path to Equilibrium|
|30 Oct, 2017||Two-Person Zero-sum Games & the Minimax Theorem|
Understanding Multiple-People General-sum Games
Lecture Note 2 --- CLICK HERE
|Andersen and Feige on Application of Zero-sum game on Probabilistic Mapping (discussing the work of Räcke in STOC 2008)|
|6 Nov, 2017||Price of Anarchy (PoA) and Price of Stability (PoS)|
Splittable Routing Game and its PoA Analysis
Lecture Note 2 (continuation of last lecture) --- CLICK HERE
|Exercise Sheet 2 --- CLICK HERE||Exercise Session on 7 Nov, 2017||Chen, Lu: Generalized Mirror Descents in Congestion Games (AAMAS 2014, Artificial Intelligence 2016)|
Tsaknakis, Spirakis: An Optimization Approach for Approximating Nash Equilibria (WINE 2007, Internet Maths. 2008) --- Also trace the literature cited in this paper about the gradient-descent based approach for finding Approximate NE.
|13 Nov, 2017||Smoothness framework of PoA Analysis|
Unsplittable Selfish Routing: Existence & Algorithm
Lecture Note 3 --- CLICK HERE
|Exercise Session on 14 Nov, 2017||Awerbuch, Azar, Epstein: The Price of Routing Unsplittable Flow (STOC 2005, SICOMP 2013)|
Lipton, Markakis, Mehta: Playing Large Games Using Simple Strategies (EC 2003)
In the lecture note, we have a rather concise section discussing PLS-completeness of Unsplittable Selfish Routing. See Roughgarden's Lecture Note for a more elaborated discussion.
|20 Nov, 2017||Lemke-Howson Algorithm for Computing Nash Equilibrium of Two-Player General-sum Games|
PPAD Complexity Class
Lecture Note 4 --- CLICK HERE
|Exercise Sheet 3 --- CLICK HERE||Herings, Peeters: Homotopy Methods to Compute Equilibria in Game Theory (Economic Theory 2010)|
Goldberg, Papadimitriou, Savani: The Complexity of the Homotopy Method, Equilibrium Selection, and the Lemke-Howson Solutions (FOCS 2011, ACM TEAC 2013)
|27 Nov, 2017||Multiplicative Weight Updates|
Coarse Correlated Equilibrium
|Exercise Session on 28 Nov, 2017|
|4 Dec, 2017||Fisher Markets, Market Equilibrium|
Tatonnement in Fisher Market, and Misspending Potential Function
(Exercise Sheet 4 OUT)
|11 Dec, 2017||Proportional Response Dynamics in Fisher Market|
Basic Concepts/tools in Network Flow Algorithm for Computing Market Equilibrium
|Exercise Session on 12 Dec, 2017 (by Marco)|
|18 Dec, 2017||Orlin's Weakly Poly-time Algorithm|
Arrow-Debreu Markets, Balanced Flow,
(Exercise Sheet 5 OUT)
|8 Jan, 2018||Network Flow Algorithms for Linear Arrow-Debreu Markets (by Bhaskar)||Exercise Session on 9 Jan, 2018|
|15 Jan, 2018||Network Flow Algorithms for Linear Arrow-Debreu Markets (by Bhaskar)|
(Exercise Sheet 6 OUT)
|22 Jan, 2018||Introduction to Mechanism Design|
Truthfulness, VCG Mechanism and its Complexity Concern
|Exercise Session on 23 Jan, 2018|
|29 Jan, 2018||Truthful Mechanism Design without Money Transfer|
Normed Utility Model
Partial Allocation Mechanism
(Exercise Sheet 7 OUT)
|There will not be an exercise session to cover Exercise Sheet 7. Instead, we will post solutions of Exercise Sheet 7 immediately after its due date.|
|30 Jan, 2018||Generalized-Second-Price (GSP) Auction|
PoA Analysis of GSP Auction
(THIS IS A TUESDAY!!!)