PHP Manual

fann_set_activation_steepness_hidden(resource $ann, float $activation_steepness): bool

Sets the steepness of the activation steepness for all neurons in the all hidden layers.

Returns true on success, or false otherwise.

fann_set_activation_steepness() - Sets the activation steepness for supplied neuron and layer number
fann_set_activation_steepness_layer() - Sets the activation steepness for all of the neurons in the supplied layer number
fann_set_activation_steepness_output() - Sets the steepness of the activation steepness in the output layer
fann_get_activation_steepness() - Returns the activation steepness for supplied neuron and layer number
fann_set_activation_function() - Sets the activation function for supplied neuron and layer

fann_set_activation_steepness_hidden