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 Regulation of hierarchic decisions in intelligent systems

Details
Inventors: Lee, Shih-Jong J.;
Assignee:
Primary Examiner: Hirl; Joseph P.
Assistant Examiner:
Attorney, Agent or Firm:

A regulation method for decision tree construction is described wherein decision rules can be automatically adjusted between crisp and soft decisions. Starting with a conventional decision tree, additional statistics are stored at the terminal and non-terminal nodes during training and used during application to new samples. The regulation process allows automatic determination of tree structure. It also allows incremental updating of a regulation decision tree with graceful change to classification performance characteristics. Compound regulation decision trees are described for use to update the decision structure when new training input samples include new classes. Methods for pruning regulation decision trees, for focusing regulation decision trees, for determining optimal depth and regulation parameters and for determining optimal sample weighting are taught.

DETAILED DESCRIPTION This invention describes new methods for regulating hierarchic decisions in intelligent systems.
Storing additional statistics acquired during training for both terminal and non-terminal nodes alters a conventional decision tree structure.
These statistics are used to create smooth decision boundaries with the smoothness adjustable and optimizable through the choice of sample weights and regulation parameters.
Methods for trimming regulation trees and focusing them arise through selection of weights, tree depth, regulation parameters, and evaluation of accuracies obtained.
Methods for incrementally increasing the number of training samples for an already trained regulation decision tree provide graceful change to classification characteristics.
Methods for construction of compound trees support the incremental addition of new trained classes and new training samples.



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