Overview
KB
Technical FAQ
PHP Manual
CSS2 Manual
HTML Manual
JS Guide
JS Reference
PhpDock Manual
Nu-Coder Manual
PhpExpress Manual
PHP Joomla
Development
Learn PHP
 
<fann_set_activation_function_outputfann_set_activation_steepness_hidden>
^Fann FunctionsLast updated: Mon, 26 Oct 2026

fann_set_activation_steepness

(PECL fann >= 1.0.0)

fann_set_activation_steepness — Sets the activation steepness for supplied neuron and layer number

Description

function fann_set_activation_steepness(
    resource $ann,
    float $activation_steepness,
    int $layer,
    int $neuron
): bool

Set the activation steepness for neuron number neuron 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.

The steepness of an activation function says something about how fast the activation function goes from the minimum to the maximum. A high value for the activation function will also give a more aggressive training.

When training neural networks where the output values should be at the extremes (usually 0 and 1, depending on the activation function), a steep activation function can be used (e.g. 1.0).

The default activation steepness is 0.5.

Parameters

ann

Neural network resource.

activation_steepness

The activation steepness.

layer

Layer number.

neuron

Neuron number.

Return Values

Returns true on success, or false otherwise.

See Also


<fann_set_activation_function_outputfann_set_activation_steepness_hidden>
^Fann FunctionsLast updated: Mon, 26 Oct 2026