NAME

AI::FANN - Perl wrapper for the Fast Artificial Neural Network library

SYNOPSIS

Train...

use AI::FANN qw(:all);

# create an ANN with 2 inputs, a hidden layer with 3 neurons and an
# output layer with 1 neuron:
my $ann = AI::FANN->new_standard(2, 3, 1);

$ann->hidden_activation_function(FANN_SIGMOID_SYMMETRIC);
$ann->output_activation_function(FANN_SIGMOID_SYMMETRIC);

# create the training data for a XOR operator:
my $xor_train = AI::FANN::TrainData->new( [-1, -1], [-1],
                                          [-1, 1], [1],
                                          [1, -1], [1],
                                          [1, 1], [-1] );

$ann->train_on_data($xor_train, 500000, 1000, 0.001);

$ann->save("xor.ann");

Run...

use AI::FANN;

my $ann = AI::FANN->new_from_file("xor.ann");

for my $a (-1, 1) {
  for my $b (-1, 1) {
    my $out = $ann->run([$a, $b]);
    printf "xor(%f, %f) = %f\n", $a, $b, $out->[0];
  }
}

DESCRIPTION

WARNING:  THIS IS A VERY EARLY RELEASE,
          MAY CONTAIN CRITICAL BUGS!!!

AI::FANN is a Perl wrapper for the Fast Artificial Neural Network (FANN) Library available from http://fann.sourceforge.net:

Fast Artificial Neural Network Library is a free open source neural
network library, which implements multilayer artificial neural
networks in C with support for both fully connected and sparsely
connected networks. Cross-platform execution in both fixed and
floating point are supported. It includes a framework for easy
handling of training data sets. It is easy to use, versatile, well
documented, and fast. PHP, C++, .NET, Python, Delphi, Octave, Ruby,
Pure Data and Mathematica bindings are available. A reference manual
accompanies the library with examples and recommendations on how to
use the library. A graphical user interface is also available for
the library.

AI::FANN object oriented interface provides an almost direct map to the C library API. Some differences have been introduced to make it more perlish:

Two classes are used: AI::FANN that wraps the C struct fann type and AI::FANN::TrainData that wraps struct fann_train_data.
Prefixes and common parts on the C function names referring to those structures have been removed. For instance C fann_train_data_shuffle becomes AI::FANN::TrainData::shuffle that will be usually called as...
```
$train_data->shuffle;
```
Pairs of C get/set functions are wrapped in Perl with dual accessor methods named as the attribute (and without any set_/get_ prefix). For instance:
```
$ann->bit_fail_limit($limit); # sets the bit_fail_limit

$bfl = $ann->bit_fail_limit;  # gets the bit_fail_limit
```
Pairs of get/set functions requiring additional indexing arguments are also wrapped inside dual accessors:
```
# sets:
$ann->neuron_activation_function($layer_ix, $neuron_ix, $actfunc);

# gets:
$af = $ann->neuron_activation_function($layer_ix, $neuron_ix);
```
Important: note that on the Perl version, the optional value argument is moved to the last position (on the C version of the set_ method it is usually the second argument).

Some functions have been renamed to make the naming more consistent and to follow Perl conventions:

C                                      Perl
-----------------------------------------------------------
fann_create_from_file               => new_from_file
fann_create_standard                => new_standard
fann_get_num_input                  => num_inputs
fann_get_activation_function        => neuron_activation_function
fann_set_activation_function        => ^^^
fann_set_activation_function_layer  => layer_activation_function
fann_set_activation_function_hidden => hidden_activation_function
fann_set_activation_function_output => output_activation_function

Boolean methods return true on success and undef on failure.
Any error reported from the C side is automaticaly converter to a Perl exception. No manual error checking is required after calling FANN functions.
Memory management is automatic, no need to call destroy methods.
Doubles are used for computations (using floats or fixed point types is not supported).

CONSTANTS

All the constants defined in the C documentation are exported from the module:

# import all...
use AI::FANN ':all';

# or individual constants...
use AI::FANN qw(FANN_TRAIN_INCREMENTAL FANN_GAUSSIAN);

The values returned from this constant subs yield the integer value on numerical context and the constant name when used as strings.

The constants available are:

# enum fann_train_enum:
FANN_TRAIN_INCREMENTAL
FANN_TRAIN_BATCH
FANN_TRAIN_RPROP
FANN_TRAIN_QUICKPROP

# enum fann_activationfunc_enum:
FANN_LINEAR
FANN_THRESHOLD
FANN_THRESHOLD_SYMMETRIC
FANN_SIGMOID
FANN_SIGMOID_STEPWISE
FANN_SIGMOID_SYMMETRIC
FANN_SIGMOID_SYMMETRIC_STEPWISE
FANN_GAUSSIAN
FANN_GAUSSIAN_SYMMETRIC
FANN_GAUSSIAN_STEPWISE
FANN_ELLIOT
FANN_ELLIOT_SYMMETRIC
FANN_LINEAR_PIECE
FANN_LINEAR_PIECE_SYMMETRIC
FANN_SIN_SYMMETRIC
FANN_COS_SYMMETRIC
FANN_SIN
FANN_COS

# enum fann_errorfunc_enum:
FANN_ERRORFUNC_LINEAR
FANN_ERRORFUNC_TANH

# enum fann_stopfunc_enum:
FANN_STOPFUNC_MSE
FANN_STOPFUNC_BIT

CLASSES

The classes defined by this package are:

AI::FANN

Wraps C struct fann types and provides the following methods (consult the C documentation for a full description of their usage):

AI::FANN->new_standard(@layer_sizes)

AI::FANN->new_sparse($connection_rate, @layer_sizes)

AI::FANN->new_shortcut(@layer_sizes)

AI::FANN->new_from_file($filename)

$ann->save($filename)

$ann->run($input)

input is an array with the input values.

returns an array with the values on the output layer.

$out = $ann->run([1, 0.6]);
print "@$out\n";

$ann->randomize_weights($min_weight, $max_weight)

$ann->train($input, $desired_output)

$input and $desired_output are arrays.

$ann->test($input, $desired_output)

$input and $desired_output are arrays.

It returns an array with the values of the output layer.

$ann->reset_MSE

$ann->train_on_file($filename, $max_epochs, $epochs_between_reports, $desired_error)

$ann->train_on_data($train_data, $max_epochs, $epochs_between_reports, $desired_error)

$train_data is a AI::FANN::TrainData object.

$ann->cascadetrain_on_file($filename, $max_neurons, $neurons_between_reports, $desired_error)

$ann->cascadetrain_on_data($train_data, $max_neurons, $neurons_between_reports, $desired_error)

$train_data is a AI::FANN::TrainData object.

$ann->train_epoch($train_data)

$train_data is a AI::FANN::TrainData object.

$ann->print_connections

$ann->print_parameters

$ann->cascade_activation_functions()

returns a list of the activation functions used for cascade training.

$ann->cascade_activation_functions(@activation_functions)

sets the list of activation function to use for cascade training.

$ann->cascade_activation_steepnesses()

returns a list of the activation steepnesses used for cascade training.

$ann->cascade_activation_steepnesses(@activation_steepnesses)

sets the list of activation steepnesses to use for cascade training.

$ann->training_algorithm

$ann->training_algorithm($training_algorithm)

$ann->train_error_function

$ann->train_error_function($error_function)

$ann->train_stop_function

$ann->train_stop_function($stop_function)

$ann->learning_rate

$ann->learning_rate($rate)

$ann->learning_momentum

$ann->learning_momentum($momentun)

$ann->bit_fail_limit

$ann->bit_fail_limit($bfl)

$ann->quickprop_decay

$ann->quickprop_decay($qpd)

$ann->quickprop_mu

$ann->quickprop_mu($qpmu)

$ann->rprop_increase_factor

$ann->rprop_increase_factor($factor)

$ann->rprop_decrease_factor

$ann->rprop_decrease_factor($factor)

$ann->rprop_delta_min

$ann->rprop_delta_min($min)

$ann->rprop_delta_max

$ann->rprop_delta_max($max)

$ann->num_inputs

$ann->num_outputs

$ann->total_neurons

$ann->total_connections

$ann->MSE

$ann->bit_fail

cascade_output_change_fraction

cascade_output_change_fraction($fraction)

$ann->cascade_output_stagnation_epochs

$ann->cascade_output_stagnation_epochs($epochs)

$ann->cascade_candidate_change_fraction

$ann->cascade_candidate_change_fraction($fraction)

$ann->cascade_candidate_stagnation_epochs

$ann->cascade_candidate_stagnation_epochs($epochs)

$ann->cascade_weight_multiplier

$ann->cascade_weight_multiplier($multiplier)

$ann->cascade_candidate_limit

$ann->cascade_candidate_limit($limit)

$ann->cascade_max_out_epochs

$ann->cascade_max_out_epochs($epochs)

$ann->cascade_max_cand_epochs

$ann->cascade_max_cand_epochs($epochs)

$ann->cascade_num_candidates

$ann->cascade_num_candidate_groups

$ann->cascade_num_candidate_groups($groups)

$ann->neuron_activation_function($layer_index, $neuron_index)

$ann->neuron_activation_function($layer_index, $neuron_index, $activation_function)

$ann->layer_activation_function($layer_index, $activation_function)

$ann->hidden_activation_function($layer_index, $activation_function)

$ann->output_activation_function($layer_index, $activation_function)

$ann->neuron_activation_steepness($layer_index, $neuron_index)

$ann->neuron_activation_steepness($layer_index, $neuron_index, $activation_steepness)

$ann->layer_activation_steepness($layer_index, $activation_steepness)

$ann->hidden_activation_steepness($layer_index, $activation_steepness)

$ann->output_activation_steepness($layer_index, $activation_steepness)

$ann->num_layers

returns the number of layers on the ANN

$ann->layer_num_neurons($layer_index)

return the number of neurons on layer $layer_index.

$ann->num_neurons

return a list with the number of neurons on every layer

AI::FANN::TrainData

Wraps C struct fann_train_data and provides the following method:

AI::FANN::TrainData->new_from_file($filename)

AI::FANN::TrainData->new($input1, $output1 [, $input2, $output2, ...])

$inputx and $outputx are arrays with the values of the input and output layers.

AI::FANN::TrainData->new_empty($num_data, $num_inputs, $num_outputs)

returns a new AI::FANN::TrainData object of the sizes indicated on the arguments. The initial values of the data contained inside the object are random and should be set before using the train data object for training an ANN.

$train->data($index)

returns two arrays with the values of the input and output layer respectively for that index.

$train->data($index, $input, $output)

$input and $output are two arrays.

The input and output layers at the index $index are set to the values on these arrays.

$train->shuffle

$train->scale_input($new_min, $new_max)

$train->scale_output($new_min, $new_max)

$train->scale($new_min, $new_max)

$train->subset($pos, $length)

$train->num_inputs

$train->num_outputs

$train->length

INSTALLATION

See the README file for instruction on installing this module.

BUGS

Only tested on Linux.

I/O is not performed through PerlIO because the C library doesn't have the required infrastructure to do that.

Send bug reports to my email address or use the CPAN RT system.

COPYRIGHT AND LICENSE

This Perl module is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.

Distributed under the GNU Lesser General Public License.

To install AI::FANN, copy and paste the appropriate command in to your terminal.

cpanm

cpanm AI::FANN

CPAN shell

perl -MCPAN -e shell
install AI::FANN

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

SYNOPSIS

DESCRIPTION

CONSTANTS

CLASSES

AI::FANN

AI::FANN::TrainData

INSTALLATION

BUGS

SEE ALSO

COPYRIGHT AND LICENSE

Module Install Instructions