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A Very Brief Look at the Bing Ranking Algorithm Chris Burges Ofer Dekel Qiang Wu Krysta Svore Presented by Chris Burges at the MSR Faculty Summit, July.

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Presentation on theme: "A Very Brief Look at the Bing Ranking Algorithm Chris Burges Ofer Dekel Qiang Wu Krysta Svore Presented by Chris Burges at the MSR Faculty Summit, July."— Presentation transcript:

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2 A Very Brief Look at the Bing Ranking Algorithm Chris Burges Ofer Dekel Qiang Wu Krysta Svore Presented by Chris Burges at the MSR Faculty Summit, July 18, 2011 (narration begins on next slide)

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4 How LambdaRank is Trained Query: “107.7 the end” URLRatingModel Score Perfect _The_End Good theend Good0.19 he_End Fair0.01 Bad0.23 URLRatingModel ScoreForces Bad _The_End Good theend Good0.19 Perfect0.13 he_End Fair0.01

5 Building an ensemble of regression trees RatingUrlScoreForce Badhttp://www.thewolf.co.uk/ Goodhttp://en.wikipedia.org/wiki/107.7_The_End Goodhttp://www.myspace.com/1077theend Perfecthttp://www.1077theend.com Fairhttp://en.wikipedia.org/wiki/The_End RatingUrlScoreForce Goodhttp://en.wikipedia.org/wiki/107.7_The_End Badhttp://www.thewolf.co.uk/ Goodhttp://www.myspace.com/1077theend Perfecthttp://www.1077theend.com Fairhttp://en.wikipedia.org/wiki/The_End RatingUrlScoreForce Goodhttp://en.wikipedia.org/wiki/107.7_The_End Perfecthttp://www.1077theend.com Goodhttp://www.myspace.com/1077theend Badhttp://www.thewolf.co.uk/ Fairhttp://en.wikipedia.org/wiki/The_End

6 How is a split computed? RatingUrlBM25FCount of query in body Anchor text matches query Function(click frequency) Badhttp://www.thewolf.co.uk/ Goodhttp://en.wikipedia.org/wiki/107.7_The_End Goodhttp://www.myspace.com/1077theend Perfecthttp://www.1077theend.com Fairhttp://en.wikipedia.org/wiki/The_End L R

7 FastRank: Algorithms ↔ Engineering We only need one linear scan of the data (in a given node) to compute this. Thresholds Forces Counts

8 Thanks!


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