void fann_set_activation_steepness_hidden(struct fann * ann, fann_type steepness);
Set the steepness of the activation function of the hidden layers of ann to steepness.
The steepness defaults to 0.5 and a larger steepness will make the slope of the activation function more steep, while a smaller steepness will make the slope less steep. A large steepness is well suited for classification problems while a small steepness is well suited for function approximation.
This function appears in FANN >= 1.2.0. and replaces the fann_set_activation_hidden_steepness function from FANN >= 1.0.0.