METHOD AND SYSTEM FOR RETRIEVING, DETECTING AND IDENTIFYING MAIN CLUSTER AND OUTLIER CLUSTER IN LARGE SCALE DATABASE, RECORDING MEDIUM AND SERVER

摘要

PROBLEM TO BE SOLVED: To provide a method and a system for detecting, retrieving and identifying a main cluster and an outlier cluster in a large scale database, and to provide a recording medium and a server. SOLUTION: This method includes a step for generating a document matrix from a preceding document by using at least one attribute, a step for generating a residual matrix scaled on the basis of the document matrix from a prescribed function, a step for performing singular value decomposition to obtain a base vector corresponding to a maximum singular value, a step for reconstructing the residual matrix, dynamically scaling the reconstructed residual matrix and obtaining another base vector, a step for repeating from the singular value decomposition step to the reconstruction step to generate a set of prescribed base vectors, and a step for performing dimensional reduction of the document matrix and detecting, retrieving and identifying a document in a database.