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Optimizing Structure and Internal Unit Weights of Echo State Network for an Efficient LMS-Based Online Training

Author

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  • Javad Saadat

    (University of Birjand)

  • Mohsen Farshad

    (University of Birjand)

  • Hussein Eliasi

    (University of Birjand)

Abstract

Echo state network (ESN) is a special type of recurrent neural networks (RNN) wherein a dynamic reservoir is used in the hidden layer, the weight of internal units of ESN is kept fix during training process, and output weights are the only trainable weights. Therefore, network training in an offline mode can be changed into a linear regression equation which is simply solved, although it is required to use online training of ESN in some applied problems. The least mean square (LMS) algorithm can provide an easy and constant method for online training of ESN; however, the huge eigenvalue spreads of the correlation matrix of internal network states reduce the speed of the algorithm convergence. In this study, harmony search algorithm (HSA) is used to optimally produce the structure and weight of internal network units. It is possible to significantly reduce the eigenvalue spreads of the correlation matrix of network states by means of this algorithm. Thereafter, the LMS algorithm is used for the online training of ESN built with the help of HSA. Already-obtained simulation results show that the eigenvalue spreads of the correlation matrix are reduced millions of times, and the LMS algorithm increases the online training speed of the network several times with an acceptable precision of training.

Suggested Citation

  • Javad Saadat & Mohsen Farshad & Hussein Eliasi, 2023. "Optimizing Structure and Internal Unit Weights of Echo State Network for an Efficient LMS-Based Online Training," SN Operations Research Forum, Springer, vol. 4(1), pages 1-14, March.
    • Handle: RePEc:spr:snopef:v:4:y:2023:i:1:d:10.1007_s43069-023-00196-6
    DOI: 10.1007/s43069-023-00196-6
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    References listed on IDEAS

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    1. Hu, Huanling & Wang, Lin & Tao, Rui, 2021. "Wind speed forecasting based on variational mode decomposition and improved echo state network," Renewable Energy, Elsevier, vol. 164(C), pages 729-751.
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