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Neural Computation, Vol 11, Issue 2 483-497, Copyright © 1999 by The MIT Press

LETTERS

Boosted mixture of experts: an ensemble learning scheme

R Avnimelech and N Intrator
Department of Computer Science, Tel-Aviv University, Ramat-Aviv, 69978, Israel.

We present a new supervised learning procedure for ensemble machines, in which outputs of predictors, trained on different distributions, are combined by a dynamic classifier combination model. This procedure may be viewed as either a version of mixture of experts (Jacobs, Jordan, Nowlan, & Hintnon, 1991), applied to classification, or a variant of the boosting algorithm (Schapire, 1990). As a variant of the mixture of experts, it can be made appropriate for general classification and regression problems by initializing the partition of the data set to different experts in a boostlike manner. If viewed as a variant of the boosting algorithm, its main gain is the use of a dynamic combination model for the outputs of the networks. Results are demonstrated on a synthetic example and a digit recognition task from the NIST database and compared with classifical ensemble approaches.


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