CF框架下物质扩散算法改进策略研究

2014年11月30RecommenderCollaborativeContent-basedNetwork-basedHybridSimilarity-basedDiffusion-basedDimensionalityreductionSocialMeta刘建国,周涛,汪秉宏个性化推荐系统研究进展[J].自然科学进展2009,19(1):1-LinyuanLü,MatúšMedo,etal,Recommendersystems,PhysicsReports,Volume519,Issue1,October2012,Pages1-49,ISSN0370-1573.Diffusionvs.Collaborative isakind 1l a ll

ai

assalton

aa

1kk2

l

lKeyfactorsofitemSimilarityofitemαandβdepends▫kαand▫Numberofcommonusersofαand▫InterestdiversityofcommonCFusuallycapturestheformertwoMDcapturesallthethreeDiffusion-likeDiffusion-likeMD-MassDiffusion:

1

l HC-HeatConduction:

1

a

l

l

l

Biased

l

aakPreferential

l r r

akPartInformationfilteringviabalanceddiffusiononbipartitenetworksBalancedDiffusion

ak l

kk l [1]D.-C.Nie,Y.-H.An,Q.Dong,Y.Fu,T.Zhou,Informationfilteringviabalanceddiffusiononbipartitenetworks,PhysicaA(2014),/10.1016/j.physa.2014.11.018OptimalparameterComparisonofDegreeofitemsinrecommendingPartInformationFilteringviastrengtheningthecorrelationofsmalldegreeobjects a

a

l

l DistributionofCorrelationbetween

c(Correlation

c(CorrelationThecorrelationobeypower-lawdistributionwhichmeansmostofthecorrelationvaluebetweenobjectsaresmall.

l

againstobject a

a

ll

l σ=σ=Table2.PerformancesonMovieLensandTable3.PerformancesonMovieLensondifferentTable4.PerformancesonNetflixondifferentPartAttemptonnonlinearhybridofCFandAttemptal

a

l

l

l Bettermodel-

alal

l Table6.ComparisonofdifferentDataPartFour:Directedsimilarityinkk k a w RankingDiffusion-likealgorithmsareessentiallyWecangetbetterrecommendationresults,▫Increasingthesimilarityofsmall-degree▫ModifyingthesimilarityofCFinspiredbydiffusion-likesimil