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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 331331 $ -->
<refentry xml:id="function.fann-create-train-from-callback" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>fann_create_train_from_callback</refname>
<refpurpose>Creates the training data struct from a user supplied function</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>resource</type><methodname>fann_create_train_from_callback</methodname>
<methodparam><type>int</type><parameter>num_data</parameter></methodparam>
<methodparam><type>int</type><parameter>num_input</parameter></methodparam>
<methodparam><type>int</type><parameter>num_output</parameter></methodparam>
<methodparam><type>collable</type><parameter>user_function</parameter></methodparam>
</methodsynopsis>
<para>
Creates the training data struct from a user supplied function. As the training data are numerable (data 1, data 2...),
the user must write a function that receives the number of the training data set (input, output) and returns the set.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>num_data</parameter></term>
<listitem>
<para>
The number of training data
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>num_input</parameter></term>
<listitem>
<para>
The number of inputs per training data
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>num_output</parameter></term>
<listitem>
<para>
The number of ouputs per training data
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>user_function</parameter></term>
<listitem>
<para>
The user supplied function with following parameters:
<simplelist>
<member><literal>num</literal> - The number of the training data set</member>
<member><literal>num_input</literal> - The number of inputs per training data</member>
<member><literal>num</literal> - The number of ouputs per training dataThe number of inputs per training data</member>
</simplelist>
</para>
<para>
The function should return an associative array with keys <literal>input</literal> and <literal>output</literal> and
two array values of input and output.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
&fann.return.train;
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><methodname>fann_create_train_from_callback</methodname> example</title>
<programlisting role="php">
<![CDATA[
<?php
function create_train_callback($num_data, $num_input, $num_output) {
return array(
"input" => array_fill(0, $num_input, 1),
"output" => array_fill(0, $num_output, 1),
);
}
$num_data = 3;
$num_input = 2;
$num_output = 1;
$train_data = fann_create_train_from_callback($num_data, $num_input, $num_output, "create_train_callback");
if ($train_data) {
// Do something with $train_data
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>fann_read_train_from_file</function></member>
<member><function>fann_train_on_data</function></member>
<member><function>fann_destroy_train</function></member>
<member><function>fann_save_train</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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