Create a bubble neighborhood function that will return 1.0 (full update)
for any neuron that is plus or minus the width distance from the winning
neuron.
A radial basis function (RBF) network uses several radial basis
functions to provide a more dynamic hidden layer activation function
than many other types of neural network.
Set the number of output neurons, should not be used with a hopfield
neural network, because the number of input neurons defines the number of
output neurons.