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Query-based learning applied to partially trained multilayer perceptrons

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4 Author(s)
Jenq-Neng Hwang ; Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA ; Choi, J.J. ; Oh, S. ; Marks, R.J.

An approach is presented for query-based neural network learning. A layered perceptron partially trained for binary classification is considered. The single-output neuron is trained to be either a zero or a one. A test decision is made by thresholding the output at, for example, one-half. The set of inputs that produce an output of one-half forms the classification boundary. The authors adopted an inversion algorithm for the neural network that allows generation of this boundary. For each boundary point, the classification gradient can be generated. The gradient provides a useful measure of the steepness of the multidimensional decision surfaces. Conjugate input pairs are generated using the boundary point and gradient information and presented to an oracle for proper classification. These data are used to refine further the classification boundary, thereby increasing the classification accuracy. The result can be a significant reduction in the training set cardinality in comparison with, for example, randomly generated data points. An application example to power system security assessment is given

Published in:

Neural Networks, IEEE Transactions on  (Volume:2 ,  Issue: 1 )

Date of Publication:

Jan 1991

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