Toronto
Networking Seminar 2005
Learning
via Correlated Fictitious Play:
Identical Interest
Games and Decentralized Optimization
Stephen
Patek
University of Virginia
Date:
December 2, 3pm
Location: 1210 Bahen Center
Abstract
We
study a new class of fictitious-play
algorithms for identical interest games, where, instead of assuming
that all
players act according to independent mixed strategies, each player
interprets
the play history of all other players as though they are acting in a
correlated
fashion. Instead of evolving a set of mixed strategies, one for each
player,
our Correlated Fictitious Play (CFP) algorithm maintains a mixed
strategy over
the joint selection of actions by all players, and at each stage of the
algorithm each player chooses a pure action that is a best response
assuming
that all other players play according to the relative frequency
distribution of
the joint selection of actions. We establish a convergence property
associated
with this algorithm which asserts that the limit points of CFP are
“endogenous”
correlated equilibria (a result analogous to Monderer and
Shapley’s convergence
theorem for conventional fictitious play and its set convergence to
mixed
strategy Nash equilibria). Our setting allows us to generalize this
result to
(1) allow for the approximate computation of best replies by sampling
the play
history distribution and (2) allow for the noisy evaluation of
disutility
associated with the specification of joint actions. We use the
generalized
convergence theorem to motivate the construction of a decentralized
simulation optimization
algorithm based on CFP, where we attribute player status to the
individual
components of the solution vector for the optimization problem. We
illustrate
our results as they apply to an Internet traffic engineering problem.
Bio:
Stephen
D. Patek is an
Associate
Professor of Systems and Information Engineering at the University
of Virginia.
He received his
Bachelor’s degree in Electrical Engineering in 1991 from the University
of Tennessee,
Knoxville.
As an ONR Fellow, he completed his SMEE and Ph.D. degrees in Electrical
Engineering and Computer Science (EECS) at the Massachusetts Institute
of
Technology, in 1994 and 1997 respectively. Dr. Patek’s
research interests are
in the areas of Stochastic Optimization, Control, and Game Theory, with
applications in communications networks and sensor systems.
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