8[Oct 15]Collaborative Filtering [Lester Mackey].pdf

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1、IntroPrelimClass/RegMFExtendComboConcludeCollaborativeFilteringPracticalMachineLearning,CS294-34LesterMackeyBasedonslidesbyAleksandrSimmaOctober18,2009LesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeOutline1ProblemFormulationCenteringShrinkage2PreliminariesNaiveBayes

2、KNN3Classification/RegressionSVDFactorAnalysis4LowDimensionalMatrixFactorizationImplicitFeedbackTimeDependence5Extensions6CombiningMethodsChallengesforCF7ConclusionsReferencesLesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeWhatisCollaborativeFiltering?GroupofusersGrou

3、pofitemsLesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeWhatisCollaborativeFiltering?GroupofusersGroupofitemsObservesomeuser-itempreferencesPredictnewpreferences:DoesBoblikestrawberries???LesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeCo

4、llaborativeFilteringintheWild...Amazon.comrecommendsproductsbasedonpurchasehistoryLinderetal.,2003LesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeCollaborativeFilteringintheWild...GoogleNewsrecommendsnewarticlesbasedonclickandsearchhistoryMillionsofusers,millionsof

5、articlesDasetal.,2007LesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeCollaborativeFilteringintheWild...Netflixpredictsother“MoviesYou’ll~”basedonpastnumericratings(1-5stars)Recommendationsdrive60%ofNetflix’sDVDrentalsMostlysmaller,independentmovies(Thompson2008)http:

6、//www.netflix.comLesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeCollaborativeFilteringintheWild...NetflixPrize:BeatNetflixrecommendersystem,usingNetflixdata!Win$1millionData:480,000users18,000movies100millionobservedratings=only1.1%ofratingsobserved“TheNetflixPrizeseek

7、stosubstantiallyimprovetheaccuracyofpredictionsabouthowmuchsomeoneisgoingtoloveamoviebasedontheirmoviepreferences.”http://www.netflixprize.comLesterMackeyCollaborativeFilteringIntroPrelimClass/RegMFExtendComboConcludeWhatisCollaborativeF