Title :
Implementation issues of sigmoid function and its derivative for VLSI digital neural networks
Author :
Murtagh, P. ; Tsoi, A.C.
Author_Institution :
Dept. of Electr. Eng., Queensland Univ., St Lucia, Qld., Australia
fDate :
5/1/1992 12:00:00 AM
Abstract :
Proposes a number of different implementations for the first derivative of the sigmoid function. The implementation of the sigmoid function employs a powers-of-two piecewise linear approximation. The best implementation scheme for the derivative is suggested based on overall speed performance (circuit speed and training time) and hardware requirements.
Keywords :
computerised signal processing; neural nets; piecewise-linear techniques; VLSI digital neural networks; piecewise linear approximation; sigmoid function;
Journal_Title :
Computers and Digital Techniques, IEE Proceedings E