AI NEWBIE -- Neural Net problem/question... um Tutorial request?? :)

[talwyn]

Hey all.... playing with AI for the first time...So I got AI::Neuralnet::backprop to play with. I thought how about trying to get the thing to identify even numbers? Well I failed miserably ... I attached my code and the sample output it produced. It got numbers wrong that I explicitly gave it in its pattern set to learn. I don't understand the problem with the code and was trying to learn how the neural net thingy works so I'm a bit mystified. Am I missing something? Any help or suggestions welcome.

CODE

       use AI::NeuralNet::BackProp;

        my $net = new AI::NeuralNet::BackProp(2,5,1);
        # Add a small amount of randomness to the network


        $net->random(0.001);
        $net->range ([0,1]);

        $net->debug (4);

        # Create a data set to learn
        my @set = (
                [ 0,0,0,0,0 ], [ 1 ],
                [ 0,0,0,1,0 ], [ 1 ],
                [ 0,0,1,0,0 ], [ 1 ],
                [ 0,0,1,1,0 ], [ 1 ],
                [ 0,0,0,0,1 ], [ 0 ],
                [ 0,0,0,1,1 ], [ 0 ],
                [ 0,0,1,0,1 ], [ 0 ],
                [ 0,0,1,1,1 ], [ 0 ],
        );

        my $f = $net->learn_set (\@set);
        print "Forgetfulness: $f unit\n";


        # Run a test phrase through the network

       for ( $i = 0 ; $i < 17 ;$i++){

           @bit= (0,0,0,0,0); #reset bits

           $bit[0] = 1 if ( ($i & 16) == 16 );
           $bit[1] = 1 if ( ($i & 8) == 8 );
           $bit[2] = 1 if ( ($i & 4) == 4 );
           $bit[3] = 1 if ( ($i & 2) == 2 );
           $bit[4] = 1 if ( ($i & 1) == 1 );

           print "Testing $i   @bit -> ";
           my $result = $net->run( \@bit);
           my $answer = $$result[0];
           print "$answer\n";

      }

RESULTS

Forgetfulness: 0.0000000000
Testing 0   0 0 0 0 0 -> 1
Testing 1   0 0 0 0 1 -> 1
Testing 2   0 0 0 1 0 -> 1
Testing 3   0 0 0 1 1 -> 0
Testing 4   0 0 1 0 0 -> 1
Testing 5   0 0 1 0 1 -> 0
Testing 6   0 0 1 1 0 -> 0
Testing 7   0 0 1 1 1 -> 0
Testing 8   0 1 0 0 0 -> 1
Testing 9   0 1 0 0 1 -> 0
Testing 10   0 1 0 1 0 -> 0
Testing 11   0 1 0 1 1 -> 0
Testing 12   0 1 1 0 0 -> 0
Testing 13   0 1 1 0 1 -> 0
Testing 14   0 1 1 1 0 -> 0
Testing 15   0 1 1 1 1 -> 0
Testing 16   1 0 0 0 0 -> 1