INFORMATION RETRIEVAL DEVICE, INFORMATION RETRIEVAL METHOD, AND INFORMATION RETRIEVAL PROGRAM

摘要

An information retrieval device includes a processor that executes processing including: breaking down a natural sentence into a plurality of words and creating retrieval keys from retrieval key candidates which each include two words out of the plurality of words, on the basis of the characteristics that are given to each of the two words; specifying the documents that include the retrieval keys, and calculating the evaluation values of the specified documents and the number of specified documents; recalculating the evaluation values of the documents that correspond to the retrieval keys that are determined to be noise, on the basis of the number of specified documents; and outputting the documents on the basis of the recalculated evaluation values.

主权项

1. An information retrieval device comprising:
a processor configured to execute processing including: breaking down a natural sentence into a plurality of words, and creating retrieval keys from retrieval key candidates which each include two words out of the plurality of words, on the basis of characteristics that are given to each of the two words; specifying documents that include the retrieval keys, and calculating evaluation values of the specified documents and a number of specified documents; recalculating the evaluation values of the documents that correspond to the retrieval keys that are determined to be noise, on the basis of the number of specified documents; and outputting the documents on the basis of the recalculated evaluation values.