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First ACM International Conference on Web Search and Data Mining - WSDM 2008

SoftRank: Optimising Non-Smooth Rank Metrics

author: Michael Taylor, Microsoft Research, Cambridge
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Slides
0:00 SoftRank Optimising Non-Smooth Rank Metrics
0:18 IR Metrics are Not Smooth: NDCG
3:28 Previous Proxy Training Objectives
6:48 SoftRank Approach
9:36 Rank Distribution
11:10 Pairwise Contest Approximation
14:39 Rank Distribution Recursion
17:04 Effect of Pairwise Contest Trick
17:49 SoftNDCG
19:58 Experiments
21:16 SoftRank Results
22:20 Generalization Study
23:24 Discount Study
24:30 Conclusions

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