view release on metacpan or  search on metacpan

lib/AI/NNFlex/Dataset.pm  view on Meta::CPAN

{
	my $dataset = shift;
	my $index = shift;
	my @indexarray;

	if (!$index){return 0}

	if ($index =~ /ARRAY/)
	{
		@indexarray = @$index;
	}
	else
	{
		$indexarray[0] = $index;
	}

	my @newarray;
	my $counter=0;
	foreach (@indexarray)
	{
		unless ($counter == $_)
		{
			push @newarray,${$dataset->{'data'}}[$_];
		}
	}

	$dataset->{'data'} = \@newarray;

	return 1;
}



1;
=pod

=head1 NAME

AI::NNFlex::Dataset - support for creating/loading/saving datasets for NNFlex nets

=head1 SYNOPSIS

 use AI::NNFlex::Dataset;

 my $dataset = AI::NNFlex::Dataset->new([[0,1,1,0],[0,0,1,1]]);

 $dataset->add([[0,1,0,1],[1,1,0,0]]);

 $dataset->add([0,1,0,0]);

 $dataset->save(filename=>'test.pat');

 $dataset->load(filename=>'test.pat');

=head1 DESCRIPTION

This module allows you to construct, load, save and maintain datasets for use with neural nets implemented using the AI::NNFlex classes. The dataset consists of an array of references to arrays of data. Items may be added in pairs (useful for feedfor...

=head1 CONSTRUCTOR 

=head2 AI::NNFlex::Dataset->new([[INPUT],[TARGET]]);

Parameters:

The constructor takes an (optional) reference to an array of one or more arrays. For convenience you can specify two values at a time (for INPUT and OUTPUT values) or a single value at a time. You can also leave the parameters blank, in which case th...

The return value is an AI::NNFlex::Dataset object.

=head1 METHODS

This is a short list of the main methods implemented in AI::NNFlex::Dataset


=head2 add

 Syntax:

 $dataset->add([[INPUT],[OUTPUT]]);

or

 $dataset->add([VALUE]);

This method adds new values to the end of the dataset. You can specify the values as pairs or individually.

=head2 load

 Syntax:

 $dataset->load(filename=>'filename.pat');

Loads an SNNS type .pat file into a blank dataset. If called on an existing dataset IT WILL OVERWRITE IT!

=head2 save

 $dataset->save(filename=>'filename.pat');

Save the existing dataset as an SNNS .pat file. If the file already exists it will be overwritten.

=head2 delete

 $dataset->delete(INDEX);

or

 $dataset->delete([ARRAY OF INDICES]);

Deletes 1 or more items from the dataset by their index (counting from 0). Note that if you are using pairs of values (in a backprop net for example) you MUST delete in pairs - otherwise you will delete only the input/target, and the indices will be ...

=head1 EXAMPLES

See the code in ./examples.


=head1 PREREQs

None.

=head1 SEE ALSO

 AI::NNFlex


=head1 TODO

Method to delete existing dataset entries by index

Method to validate linear separability of a dataset.

=head1 CHANGES


=head1 COPYRIGHT

Copyright (c) 2004-2005 Charles Colbourn. All rights reserved. This program is free software; you can redistribute it and/or modify 
it under the same terms as Perl itself.

=head1 CONTACT