Information retrieval with non-negative matrix factorization

Details Information retrieval with non-negative matrix factorization Information retrieval with non-negative matrix factorization

2005-06-14

2005-06-14

Ali, Mohammad (Department: 2167)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C704S007000

Reexamination Certificate

active

06907427

ABSTRACT:
A method of indexing a database of documents, by providing a vocabulary of n terms, indexing the database in the form of a non-negative n×m index matrix V, wherein each of its m columns represents an jthdocument having n entries containing a function of the number of occurrences of a ithterm of said vocabulary appearing in said jthdocument, factoring out non-negative matrix factors T and D such that V≈TD, and wherein T is an n×r term matrix, D is an r×m document matrix, and r<nm/(n+m). The index so generated is useful in two-pass information retrieval systems.

REFERENCES:
patent: 4384329 (1983-05-01), Rosenbaum et al.
patent: 4823306 (1989-04-01), Barbic et al.
patent: 5873056 (1999-02-01), Liddy et al.

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