XOR training

    This example shows how to train data for XOR function

    Example #1 xor.data file

    4 2 1
-1 -1
-1
-1 1
1
1 -1
1
1 1
-1

    Example #2 Simple train

    <?php
    $num_input     = 2;
    $num_output = 1;
    $num_layers = 3;
    $num_neurons_hidden = 3;
    $desired_error = 0.001;
    $max_epochs = 500000;
    $epochs_between_reports = 1000;

    $ann = fann_create_standard($num_layers, $num_input, $num_neurons_hidden, $num_output);

    if (    $ann) {
    fann_set_activation_function_hidden($ann, FANN_SIGMOID_SYMMETRIC);
    fann_set_activation_function_output($ann, FANN_SIGMOID_SYMMETRIC);

    $filename = dirname(__FILE__) . "/xor.data";
    if (    fann_train_on_file($ann, $filename, $max_epochs, $epochs_between_reports, $desired_error))
    fann_save($ann, dirname(__FILE__) . "/xor_float.net");

    fann_destroy($ann);
    }
    ?>

    This example shows how to read and run data for XOR function

    Example #3 Simple test

    <?php
    $train_file     = (dirname(__FILE__) . "/xor_float.net");
    if (!    is_file($train_file))
    die(    "The file xor_float.net has not been created! Please run simple_train.php to generate it");

    $ann = fann_create_from_file($train_file);
    if (!    $ann)
    die(    "ANN could not be created");

    $input = array(-1, 1);
    $calc_out = fann_run($ann, $input);
    printf("xor test (%f,%f) -> %f\n", $input[0], $input[1], $calc_out[0]);
    fann_destroy($ann);
    ?>

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    User Contributed Notes 3 notes

    up
    68
    Aurelien Marchand
    9 years ago
    Here is an explanation for the input file for training, as it might be obvious to everyone and you must understand it to write your own:

    4 2 1 <- header file saying there are 4 sets to read, with 2 inputs and 1 output
    -1 -1 <- the 2 inputs for the 1st group
    -1 <- the 1 output for the 1st group
    -1 1 <- the 2 inputs for the 2nd group
    1 <- the 1 output for the 2nd group
    1 -1 <- the 2 inputs for the 3rd group
    1 <- the 1 output for the 3rd group
    1 1 <- the 2 inputs for the 4th group
    -1 <- the 1 output for the 4th group
    up
    7
    Ray.Paseur sometimes uses Gmail
    7 years ago
    A helpful reference for FANN is available here:
    http://leenissen.dk/fann/html/files2/theory-txt.html
    up
    1
    ithirzty
    4 years ago
    If you wan't your result to be saved after the time limit, you will need to add this to your code.
    <?php
    function shutdown()
    {
    global     $ann;
    fann_save($ann, dirname(__FILE__) . "/result.net");
    fann_destroy($ann);
    }

    register_shutdown_function('shutdown');
    ?>
    where $ann is your neural network var and 'result.net' your neural network config file.
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