Problem with fann_set_callback

[a1exsnow]

Hi!

I'm trying to use fann_set_callback based on your test:
https://github.com/bukka/php-fann/blob/master/tests/fann_set_callback_basic.phpt

When I run it, callback function is called only once. And if I try to save result to file in the end of the test I get error. So I added:
fann_save($ann, dirname( __FILE__ ) . "/fann_result.net");

and get:
PHP Warning: fann_save() expects parameter 1 to be resource, null given in fann_callback_test.php on line 40

Indeed, $ann is null. Without setting callback everything is fine. Any ideas?

Thanks, Alex.

[bukka]

Looks like $ann has not been created. Can you post the whole program (just the fann related part ofc)?

[a1exsnow]

As I said, I've just added one line to your test script, so:

function ann_callback( $ann, $train_data, $max_epochs, $epochs_between_reports, $desired_error, $epochs ) {
    var_dump($ann);
    var_dump($train_data);
    var_dump($max_epochs);
    var_dump($epochs_between_reports);
    var_dump($desired_error);
    var_dump($epochs);
}
$num_input = 2;
$num_output = 1;
$num_layers = 3;
$num_neurons_hidden = 3;
$desired_error = 0.001;
$max_epochs = 50000;
$epochs_between_reports = 1000;
$ann = fann_create_standard($num_layers, $num_input, $num_neurons_hidden, $num_output);
fann_set_callback($ann, 'ann_callback');
$filename = ( dirname( __FILE__ ) . "/fann_set_callback.tmp" );				 
$content = <<<EOF
4 2 1
-1 -1
-1
-1 1
1
1 -1
1
1 1
-1
EOF;
file_put_contents( $filename, $content );
$train_data = fann_read_train_from_file( $filename );
fann_train_on_data( $ann, $train_data, $max_epochs, $epochs_between_reports, $desired_error );

fann_save($ann, dirname( __FILE__ ) . "/fann_result.net");

[AlexKirsanoff]

Fix:

$callback = function () {

    // do something...

    return true; // should return true
};
fann_set_callback($ann, $callback);