International Business Machines Corporation

Philip Shi-Ling Yu

Ming-Syan Chen

A computer implemented system, two-step method and computer program product which improves the operations of multi-feature extraction and which efficiently develops classification rules from a large training database. Specifically, given a large training set of data tuples, the first phase, called the feature identification phase, identifies features, which have good power in separating data tuples, based on a subset of the training set. A feature that has a good power in correlating data tuples into groups is said to have a good discriminating power. Since the feature identification phase is performed on a subset of the training set, processing costs are minimized. Limiting this phase to the identification of features having good discriminating power ensures that the use of a subset of the training set does not adversely affect the validity of the conclusions drawn therefrom. In the second phase, called the feature combination phase, the identified features are evaluated in combination against the entire training set to determine the final classification rules. The prior identification of features having good discriminating power advantageously minimizes processing costs during this phase (which is run against the entire training set). The use of multiple features advantageously increases the discrimination power beyond that of the individual features.

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Chappaqua, NY, United States of America

Philip Shi-Ling Yu