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=head1 DESCRIPTION

A sub-class of C<AI::NeuralNet::Kohonen>
that impliments extra methods to make use of TK
in a very slow demonstration of how a SOM can collapse
a three dimensional space (RGB colour values) into a
two dimensional space (the display). See L<SYNOPSIS>.

The only things added are two new fields to supply to the
constructor - set C<display> to C<hex> for display as
a unified distance matrix, rather than plain grid; set
C<display_scale> for the size of the display.

=cut

use strict;
use warnings;
use Carp qw/cluck carp confess croak/;

use base "AI::NeuralNet::Kohonen";