Patent ID: 11914601
Assignee: NTT DOCOMO, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 13:
14. A re-ranking device comprising:
an input unit, implemented by circuitry, configured to receive a search query from one user;
a plurality of re-ranking models prepared in accordance with common information of a plurality of users;
a search unit, implemented by the circuitry, configured to perform a search on the basis of the search query and obtain a search result; and
a re-ranking processing unit, implemented by the circuitry, configured to select one re-ranking model on the basis of common information of the one user, and perform a re-ranking process on the search result using the one re-ranking model,
wherein
the common information is information indicating a search tendency of a user,
the re-ranking processing unit derives a search tendency from a search query received by the input unit and a search history of the one user;
the search tendency includes an association between a search query and a click log,
the re-ranking processing unit derives the search tendency by deriving the association from the search history of the one user,
the association is at least one of the number of character strings in each of the search query and the click log, the degree of matching in character strings between the search query and the click log, and a difference in character strings between the search query and the click log, and
the re-ranking model generation unit derives a search tendency based on at least one of a degree of coincidence or a difference in the number of characters of a search query and a click log, clusters log information including the search query, the search result list and the click log based on the search tendency, and generates the re-ranking models using the search query and the search result list as an explanatory variable and the click log as a response variable.