Method and apparatus for establishing topic word classes based o

Details Method and apparatus for establishing topic word classes based o Method and apparatus for establishing topic word classes based o

1998-04-29

2000-10-03

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 5, 707532, G06F 1730

Patent

active

061286133

ABSTRACT:
A computer-based method and system for establishing topic words to represent a document, the topic words being suitable for use in document retrieval. The method includes determining document keywords from the document; classifying each of the document keywords into one of a plurality of preestablished keyword classes; and selecting words as the topic words, each selected word from a different one of the preestablished keyword classes, to minimize a cost function on proposed topic words. The cost function may be a metric of dissimilarity, such as cross-entropy, between a first distribution of likelihood of appearance by the plurality of document keywords in a typical document and a second distribution of likelihood of appearance by the plurality of document keywords in a typical document, the second distribution being approximated using proposed topic words. The cost function can be a basis for sorting the priority of the documents.

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Unger, E.A. et al. ("Entropy as a Measure of Database Information", IEEE, 1990, pp. 80-87).

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