Creates the training data struct from a user supplied function

# fann_create_train_from_callback

(PECL fann >= 1.0.0)

fann_create_train_from_callback — Creates the training data struct from a user supplied function

### Description

fann_create_train_from_callback(
int `$num_data`,
int `$num_input`,
int `$num_output`,
callable `$user_function`
): resource

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.

### Parameters

`num_data`

  The number of training data

`num_input`

  The number of inputs per training data

`num_output`

  The number of outputs per training data

`user_function`

  The user supplied function with following parameters:

  - `num` - The number of the training data set
  - `num_input` - The number of inputs per training data
  - `num_output` - The number of outputs per training data

  The function should return an associative array with keys `input` and `output` and two array values of input and output.

### Return Values

Returns a train data resource on success, or `false` on error.

### Examples

Example #1 fann_create_train_from_callback() example

`<?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
}
?>`

### Notes

> Note:

> This function is only available if the fann extension has been build against libfann >= 2.2.

### See Also

- fann_read_train_from_file() - Reads a file that stores training data
- fann_train_on_data() - Trains on an entire dataset for a period of time
- fann_destroy_train() - Destructs the training data
- fann_save_train() - Save the training structure to a file

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