Signal and Data Processing

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In this paper, two kinds of chaotic neural networks are proposed to evaluate the efficiency of chaotic dynamics in robust pattern recognition. The First model is designed based on natural selection theory. In this model, attractor recurrent neural network, intelligently, guides the evaluation of chaotic nodes in order to obtain the best solution. In the second model, a different structure of chaotic neural network is presented which includes chaotic neurons in the hidden layer. The behavior of these neurons can be controlled by changing the parameters of chaotic neurons. Furthermore, both models are supposed to recognize the noisy patterns even those with high levels of additional noise (up to 60%). Using the first proposed model, the accuracy of recognition was improved by 37.16%, 29.15% and 8.5% comparing to feedforward neural network, chaotic neural network based on chaotic nodes - NDRAM, and ARNN respectively. The second model increased the accuracy of recognition by an average of 13.91%, and 5.41% in comparison to ARNN and first model. In addition, it has been observed that the second model had a better performance, even in point attractor mode, than ARNN which acts in non chaotic mode.

Keywords: Attractor Recurrent Neural Network, Chaotic Dynamics, Chaotic Neuron, Point Attractor, Robust Pattern Recognition

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