Something

my $hidden_neurons = '3'; #Number of neurons in the hidden layer
my $training_image = ''; #Image to train ANN with.
my $testing_image = ''; #Image to run through the ANN with

GetOptions(
    'hidden_neurons' => \$hidden_neurons,
    'training_image' => \$training_image,
    'testing_image'  => \$testing_image,
);