Abstract
AbstractIn this paper, a new constructive algorithm for wavelet neural networks (WNN) is proposed. Employing the time-frequency localization property of wavelet, the wavelet network is constructed from the low resolution to the high resolution. At each resolution, a new wavelet is initialized as a member of wavelet frames. The input weight freezing technique is used and the Levenberg-Marquardt (LM) algorithm, a quasi-Newton method, is used to train the new wavelet in the WNN. After training, the new wavelet will be added to the wavelet network if the reduction of the residual error between the desired output and WNN output is greater than a threshold. The proposed algorithm is suitable to situations when the wavelet library is very large. The simulations demonstrate the effectiveness of the proposed approach.
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