Information retrieval device, information retrieval method, and non-transitory computer-readable recording medium

摘要

An information retrieval device includes a degree-of-association information storage unit capable of storing an item(s) of degree-of-association information indicating a degree of association between each of an item(s) of first information and each of an item(s) of second information; an accepting unit that accepts a query including an item(s) of query information which is/are an item(s) of information used for retrieval of content; a query converter that obtains, by using an item(s) of first information corresponding to each of the item(s) of query information, and the item(s) of degree-of-association information, an item(s) of second information whose degree of association with the item(s) of first information is greater as a predetermined condition is better satisfied; and a retrieval unit that retrieves content by using the item(s) of second information obtained by the query converter. Accordingly, content necessary for a user can be retrieved.

主权项

1. An information retrieval device comprising:
a memory storing one or more selection logs that include: one or more items of first information corresponding to query information, and one or more items of second information associated with selected content; and a processor operatively coupled to the memory, the processor being programmed to perform a process including:
obtaining, from the one or more selection logs, a first selectivity of content corresponding to each of the one or more items of second information;obtaining, from the one or more selection logs, a second selectivity of content corresponding to each of the one or more items of first information and each of the one or more items of second information;calculating, for each pair of each of the one or more items of first information and each of the one or more items of second information, a matching score between each of the one or more items of first information and each of the one or more items of second information, based on the first selectivity and the second selectivity;learning a transformation matrix based on the calculated matching score, the transformation matrix having, as an element, degree of association information indicating a degree of association between each of the one or more items of first information and each of the one or more items of second information;accepting a query including one or more items of query information, the one or more items of query information being one or more items of information used for retrieval of content;obtaining a value corresponding to each of the one or more items of second information by multiplying a query vector of the accepted one or more items of query information by the learned transformation matrix; andretrieving content based on the obtained value corresponding to each of the one or more items of second information.