Jon Sanders on Collaborative Filters at SXSW
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Transcript of Jon Sanders on Collaborative Filters at SXSW
Personalizing Netflix
A brief history
Jon Sanders Recommendation Systems Engineering
Netflix Los Gatos, CA
jsanders @ netflix.com
http://jobs.netflix.com
Fun facts about Netflix World’s largest online movie rental service Founded 1997
With more than… 10M subscribers, $1B revenue 100K DVD titles, 50 distribution centers 12K streaming movies & TV episodes 1.5B minutes streamed to 1M Xbox360’s 2B movie ratings
60% of movies selected based on personalized recommendations
Connecting people with movies they’ll love
#1 in customer satisfaction Video rental companies (Consumer Reports) Online retail (ForeSee)
On an average day 2M DVDs shipped 2M movie ratings received
In the beginning…
Everyone sees the same site
Evolve methodically
The rating widget
• Ask about & predict movie Enjoyment
• User-similarity collaborative filter
• Recommendations fuel discovery
Score & sort any movie
Combine popularity & enjoyment prediction
Tune recommendations • Movie-similarity collaborative filter
• K-nearest-neighbor algorithm
• More credible connections
Interest-based discovery
Metadata connections: actor, director, genre, …
Ask about Interest
Moderate prominence of catalog areas
Ask other people
Community offers decision support
Explain why
Build trust with reflected evidence
$1M Netflix Prize • Improve accuracy of Enjoyment predictions
– 100M ratings – Achieve 10% better than Netflix RMSE
• Innovative, engaged research community
• Highly relevant results – Global and time-based corrections – SVD, RBM models – Blending predictors
A website for each subscriber
Evolution continues • Tailor with more metadata, implicit data • Streaming-specific personalization
• Collaborative Filtering is a component of personalization • People want to drive, not be led • Offer discovery, focus and decision support
http://jobs.netflix.com
Links
• http://jobs.netflix.com • http://www.netflix.com/ContactUs • http://www.netflixprize.com • http://www.netflix.com/netflixfindyourvoice • http://en.wikipedia.org/wiki/Collaborative_filtering