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Top-‐k Learning to Rank <br />
Ranking with Big Data<br />
WSDM <br />
n is usually 10 5 ~10 6<br />
Multi-‐level <br />
ratings<br />
1 2 3 4<br />
Global <br />
learning<br />
Full-‐order <br />
groundtruth<br />
Top-‐K <br />
groundtruth<br />
1 2 3 4 5 ………………………………………… n<br />
1 2 3 4 … k<br />
Global <br />
prediction<br />
Local <br />
learning<br />
Users mainly care about top-‐k ranking, k is usually 10-‐20
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