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fann-set-activation-function.xml
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fann-set-activation-function.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.fann-set-activation-function" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>fann_set_activation_function</refname>
<refpurpose>Sets the activation function for supplied neuron and layer</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>fann_set_activation_function</methodname>
<methodparam><type>resource</type><parameter>ann</parameter></methodparam>
<methodparam><type>int</type><parameter>activation_function</parameter></methodparam>
<methodparam><type>int</type><parameter>layer</parameter></methodparam>
<methodparam><type>int</type><parameter>neuron</parameter></methodparam>
</methodsynopsis>
<para>
Set the activation function for neuron number <literal>neuron</literal> in layer number
<literal>layer</literal>, counting the input layer as layer 0.
</para>
<para>
It is not possible to set activation functions for the neurons in the input layer.
</para>
<para>
When choosing an activation function it is important to note that the activation functions have different range.
<constant>FANN_SIGMOID</constant> is e.g. in the 0 - 1 range while <constant>FANN_SIGMOID_SYMMETRIC</constant> is
in the -1 - 1 range and <constant>FANN_LINEAR</constant> is unbound.
</para>
<para>
The supplied activation_function value must be
one of the <link linkend="constants.fann-activation-funcs">activation functions</link> constants.
</para>
<para>
The return value is one of the <link linkend="constants.fann-train">activation functions</link> constants.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>ann</parameter></term>
<listitem>
&fann.ann.description;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>activation_function</parameter></term>
<listitem>
<para>
The <link linkend="constants.fann-activation-funcs">activation functions</link> constant.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>layer</parameter></term>
<listitem>
<para>
Layer number.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>neuron</parameter></term>
<listitem>
<para>
Neuron number.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
&fann.return.bool;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>fann_set_activation_function_layer</function></member>
<member><function>fann_set_activation_function_hidden</function></member>
<member><function>fann_set_activation_function_output</function></member>
<member><function>fann_set_activation_steepness</function></member>
<member><function>fann_get_activation_function</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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