Fast sigmoidal function, which does not need to compute an exponential function. More...
#include <shark/Models/Neurons.h>
Public Member Functions  
template<class T >  
T  function (T x) const 
template<class T >  
T  functionDerivative (T y) const 
Fast sigmoidal function, which does not need to compute an exponential function.
It is defined as
\[ f(x)=\frac x {1+x}\]
it's derivative can be computed as
\[ f'(x)= (1  f(x))^2 \]

inline 

inline 
Definition at line 180 of file Neurons.h.
References shark::sqr().