DATABASE GENERATING DEVICE AND RELATIVE DOCUMENT/ RELATIVE WORD RETRIEVAL DEVICE, DATABASE GENERATING METHOD AND RELATIVE DOCUMENT/RELATIVE WORD RETRIEVING METHOD, AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To retrieve a relative document and a relative word even in a small memory space.;SOLUTION: A natural language analysis of respective documents included in a document group file is taken and an appearing word, the appearing frequency of the appearing word, and a list of IDs of documents where the word has appeared are extracted and saved in a word list file (S1). Then appearing words in a row direction and document numbers in a column direction are set according to the information of appearing words in the word list file to generate a word-document matrix (S2). The word-document matrix is decomposed by singular values to obtain singular value vectors, a word matrix, and a document matrix (S4), and (k) larger elements are taken out as to the singular vectors, word matrix, and document matrix to generate new singular value vectors, a word matrix, and a document matrix, thereby decreasing the number of dimensions.;COPYRIGHT: (C)2001,JPO