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Convergence Study in Extended Kalman Filter-Based Training of Recurrent Neural Networks

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2 Author(s)
Xiaoyu Wang ; Emerging Pathogens Inst., Univ. of Florida, Gainesville, FL, USA ; Yong Huang

Recurrent neural network (RNN) has emerged as a promising tool in modeling nonlinear dynamical systems, but the training convergence is still of concern. This paper aims to develop an effective extended Kalman filter-based RNN training approach with a controllable training convergence. The training convergence problem during extended Kalman filter-based RNN training has been proposed and studied by adapting two artificial training noise parameters: the covariance of measurement noise (R) and the covariance of process noise (Q) of Kalman filter. The R and Q adaption laws have been developed using the Lyapunov method and the maximum likelihood method, respectively. The effectiveness of the proposed adaption laws has been tested using a nonlinear dynamical benchmark system and further applied in cutting tool wear modeling. The results show that the R adaption law can effectively avoid the divergence problem and ensure the training convergence, whereas the Q adaption law helps improve the training convergence speed.

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Neural Networks, IEEE Transactions on  (Volume:22 ,  Issue: 4 )