Data processing: database and file management or data structures – Database and file access – Query optimization
Reexamination Certificate
2008-03-31
2010-12-07
Lu, Kuen S (Department: 2163)
Data processing: database and file management or data structures
Database and file access
Query optimization
C707S735000, C707S748000
Reexamination Certificate
active
07849076
ABSTRACT:
Embodiments of the present invention provide for methods, systems and computer program products for learning ranking functions to determine the ranking of one or more content items that are responsive to a query. The present invention includes generating one or more training sets comprising one or more content item-query pairs and determining one or more contradicting pairs in a given training sets. An optimization function to minimize the number of contradicting pairs in the training set is formulated, and modified by incorporating a grade difference between one or more content items corresponding to the query in the training set and applied to each query in the training set. A ranking function is determined based on the application of regression trees on the queries of the training set minimized by the optimization function and stored for application to content item-query pairs not contained in the one or more training sets.
REFERENCES:
patent: 7472096 (2008-12-01), Burges et al.
patent: 7647314 (2010-01-01), Sun et al.
patent: 7739264 (2010-06-01), Jones et al.
patent: 2005/0289102 (2005-12-01), Das et al.
Sun Gordon
Zha Hongyuan
Zheng Zhaohui
Ho Binh V
Lu Kuen S
Ostrow Seth H.
Ostrow Kaufman LLP
Yahoo ! Inc.
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