Collaborative FilteringPresentation by Alex HuggerFiltering DocumentsMittwoch, 2

Collaborative FilteringPresentation by Alex HuggerFiltering DocumentsMittwoch, 2 www.phwiki.com

Collaborative FilteringPresentation by Alex HuggerFiltering DocumentsMittwoch, 2

Robson, Linda, Managing Editor has reference to this Academic Journal, PHwiki organized this Journal Collaborative FilteringPresentation by Alex HuggerFiltering DocumentsMittwoch, 28. April 20102Departement/Institut/GruppeContent-Based MethodsFind other popular items by the same author or similar keywordsRecommendation quality is relatively poorMittwoch, 28. April 20103

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Filtering MusicMittwoch, 28. April 20104 Filtering JokesMittwoch, 28. April 20105 www.xkcd.orgFiltering JokesLet the users rate the jokesSort by average ratingMittwoch, 28. April 20106

Collaborative FilteringPeople who have agreed in the past tend to agree in the futureMittwoch, 28. April 20107 Good or BadMittwoch, 28. April 20108 Die Hard (1988)Dirty Dancing (1987)Good or BadMittwoch, 28. April 20109

Mittwoch, 28. April 201010 Jester 4.0 (http://eigentaste.berkeley.edu)Mittwoch, 28. April 201011 MovieLens (http://movielens.org)Mittwoch, 28. April 201012

Netflixwww.netflix.orgDVD/Blue-Ray rental in addition to video streaming1’000’000$ as long as the first beating the current recommendation algorithm by 10%Competition started in October 2006Ended July 2009Mittwoch, 28. April 201013 GroupLens: An Open Architecture as long as Collaborative Filtering of NetNewsResearch paper from 1994 by:Paul Resnick, MIT Center as long as Coordination ScienceNeophytos Iacovou, University of MinnesotaMitesh Suchak, MIT Center as long as Coordination SciencePeter Bergstrom , University of MinnesotaJohn Riedl , University of MinnesotaMittwoch, 28. April 201014NetNewsMittwoch, 28. April 201015

Problems of NetNews Signal to noise ratio is too lowSplitting bulletin board into newsgroupsModerated newsgroupsNews clientsSummary of the author in addition to subject lineDisplay discussion threads togetherString search facilitiesKill filesMittwoch, 28. April 201016 Modification to NetNewsMittwoch, 28. April 201017 Mittwoch, 28. April 201017 3.722.61Predicting ScoresScore prediction system is robust to certain differences of interpretation of the rating scaleOne user rates 3-5 in addition to the other 1-3One thinks 1 in addition to the other 5 is best scoreMittwoch, 28. April 201018

Predicting ScoresPredictions can be modeled as matrix fillingMittwoch, 28. April 201019 Predicting ScoresAssign similarities to each of the other peopleCompute over articles rated by bothPearson Correlation CoefficientsBetween -1 in addition to 1Mittwoch, 28. April 201020 Predicting ScoresCorrelation Coefficients of KenMittwoch, 28. April 201021

Predicting ScoresWeighted average of all ratings on article 6Ken’s prediction is 4.56Mittwoch, 28. April 201022 4.56Scaling IssuesRelevant per as long as mance measuresPrediction qualityCompute time in addition to disk storageRating is small, but each article may be rated by many usersVolume of ratings could exceed volume of newsMittwoch, 28. April 201023Scaling Issues Pre-fetching ratings in addition to pre-computing predictions keeps user time constantHigh computation complexityVolume of all ratings may exceed the storage capacity100’000 users rate 10 articles per day. 100 bytes are required to store a rating. 1GB of storage required per 10 days.Mittwoch, 28. April 201024

Robson, Linda Pebblecreek Post Managing Editor www.phwiki.com

Cluster ModelsMittwoch, 28. April 201025 Cluster ModelsBetter online scalability in addition to per as long as mance than classical collaborative filteringComplex in addition to extensive clustering is run offlinePrediction quality gets reducedMittwoch, 28. April 201026 Item-to-Item Collaborative FilteringMittwoch, 28. April 201027

Item-to-Item Collaborative FilteringAmazon.com extensively uses recommendation algorithms10’000’000 products in addition to customersResult returned in real-time (< 0.5s)Algorithm must respond immediately to new in as long as mationMittwoch, 28. April 201028Amazon.com Mittwoch, 28. April 201029Amazon.comMittwoch, 28. April 201030 QuestionsMittwoch, 28. April 201037ReferencesGroupLens: An Open Architecture as long as Collaborative Filtering of NetNewsPublished 1994Paul Resnick, MIT Center as long as Coordination ScienceNeophytos Iacovou, University of MinnesotaMitesh Suchak, MIT Center as long as Coordination SciencePeter Bergstrom , University of MinnesotaJohn Riedl , University of MinnesotaAmazon.com RecommendationsPublished 2003Greg LindenBrent SmithJeremy YorkMittwoch, 28. April 201038

Robson, Linda Managing Editor

Robson, Linda is from United States and they belong to Pebblecreek Post and they are from  Sun Lakes, United States got related to this Particular Journal. and Robson, Linda deal with the subjects like Local News; Regional News

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