Orthogonal features-based EEG signal denoising using fractionally compressed autoencoder

A B S T R A C T A fractional-based compressed auto-encoder architecture has been introduced to solve the problem of denoising electroencephalogram (EEG) signals. The architecture makes use of fractional calculus to calculate the gradients during the back-propagation process, as a result of which a new hyper-parameter in the form of fractional order alpha has been introduced which can be tuned to get the best denoising performance. Additionally, to avoid substantial use of memory resources, the model makes use of orthogonal features in the form of Tchebichef moments as input. The orthogonal features have been used in achieving compression at the input stage. Considering the growing use of low energy devices, compression of neural networks becomes imperative. Here, the auto-encoder's weights are compressed using the randomized singular value decomposition (RSVD) algorithm during training while evaluation is performed using various compression ratios. The experimental results show that the proposed fractionally compressed architecture provides improved denoising results on the standard datasets when compared with the existing methods. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A fractional-based compressed auto-encoder architecture is introduced to denoise EEG signals, utilizing fractional calculus for gradient calculation and introducing a new hyper-parameter for optimal denoising. Compression using orthogonal features and RSVD algorithm for weight compression during training shows improved denoising results on standard datasets, addressing the growing need for compressed neural networks on low energy devices.