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Erik Frey of Last.fm presenting at "Collaborative Filters: The Evolution of Recommendation Engines" at SXSW Interactive, March 14 2009
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Last.fm’s Recommendation Engine
Erik Frey Last.fm
Last.fm:About• Listentomusicforfree(supportedbyads)
• Besocial:25muniqueusers/month• Radio,videos,events,charts,…• Recommendations
• Foundedin2002• London
Recommendations:Overview
• Somerelationbetween– Millionsofsongs– Millionsofusers
• Last.fmexposesas:– Musicrecommendations(artists,albums,tracks,events,videos)
– Peoplerecommendations!Findyourmusicalneighbors.– Notjustforrobots:user‐to‐userrecommendations.
• Differentkindsofrecommendations:– Leanforward(e.g.browsinglistsofsimilarartists)– Leanback(e.g.personalizedradio)
Recommendations:LeanForward
Recommendations:LeanBack
Recommendations:TheRecipe
• Dataisthemostimportantingredient– Scrobbles(listeningdata)
• [user,track,timestamp]• 25billion+800millionpermonth
• Nodeliberateuserinput– SocialTags
• [user,item,tag]• 50million+2.5millionpermonth
• 300kuniquetaggerspermonth
– Andmore:love,ban,skip…
TheRecipe:Scrobbles
TheRecipe:Tags
AylaNereo
User’sattentionprofile
TheRecipe:TwoModels
Modelofhowthingsarerelated
Recs
Scrobbles,tags,…