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AdvancedArtificialIntelligence
Lecture3B:Gametheory
2OutlineDecisionswithmultipleagents:gametheory(Textbook:17.5)?
GameTheoryForgameswheretwoplayersmovesimultaneously(or,withoutknowledgeofeachother)Often,single-movegamesTwoproblemsarestudiedAgentdesignMechanismdesign
Prisoner’sDilemmaDominantStrategy:testify
(doesbetternomatterwhatotherplayerdoes)ParetoOptimal:nootherethatallplayerswouldpreferEquilibrium:noplayercanbenefitfromswitching(assumingotherplayersstaythesame)
Everygamehasatleastone(Nash)
GameConsoleGameDominantStrategy?NoEquilibrium?blu,blu;dvd,dvdParetoOptimal?Blu,blu:+9,+9
SampleGameTwofingerMorra:playersEandOshow1or2fingers;totalf.Ewinsfifeven;Oifodd.
Whatisbeststrategyforeachplayer(solution)?Purestrategy:singlemoveMixedstrategy:probabilitydistributiononmoves
-3≤UE≤2
--1/12≤UE≤-1/12
PokerDeck:KKAADeal:1cardeachRounds:raise/checkcall/foldSequentialgame;Extensiveform
ConverttoNormalFormProblem:numberofstrategiesexponentialinnumberofinformationsetsTexasHold’em:1018states.
ExtensiveGamesSequenceform(Koller):Upto25,000statesAbstractionSuits;Hi/mid/lo;betamounts;onlysomedealsCanhandlePO,multi-agent,stochastic,sequential,dynamicCan’thandle(verywell)Unknownactions;continuousactionsIrrationalopponentsUnknownutilities
MechanismDesignGameTheory:Givenagame,findrationalpolicyMechanismDesign:GivenutilityfunctionsUi,designagamesuchthattherationalstrategiesmaximize∑UiExamples:Googleads,airplanetickets,radiospectra,TCPpackets,dating,doctorinternships
AuctionAuctionisgloballybetterwithmorebiddersEasierifbiddershavedominantstrategyStrategy-proof;truth-revealing;incentivecompatibleSealedbidauctionStrategy-proof?Second-price(Vickrey)auctionPayoffforbidbwithvaluev,bestotherbidc:
U=(v–c)if(bc)else0Optimalbid:Bidv
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