PHP Manual

fann_set_activation_steepness_layer(resource $ann, float $activation_steepness, int $layer): bool

Set the activation steepness for all of the neurons in layer number layer, counting the input layer as layer 0.

It is not possible to set activation steepness for the neurons in the input layer.

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_hidden() - Sets the steepness of the activation steepness for all neurons in the all hidden layers
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_layer