Sigmoid activation function.
Namespace:
AForge.NeuroAssembly: AForge.Neuro (in AForge.Neuro.dll) Version: 2.2.5.0 (2.2.5.0)
Syntax
| C# |
|---|
[SerializableAttribute] public class SigmoidFunction : IActivationFunction, ICloneable |
Remarks
The class represents sigmoid activation function with
the next expression:
Copy 1
f(x) = ------------------
1 + exp(-alpha * x)
alpha * exp(-alpha * x )
f'(x) = ---------------------------- = alpha * f(x) * (1 - f(x))
(1 + exp(-alpha * x))^2
Output range of the function: [0, 1].
Functions graph:
