A model of the cashier’s brain
with arbitrary initial weights
Residual error = 350
The learning rule is:
With a learning rate      of
1/35, the weight changes
are +20, +50, +30
This gives new weights of
70, 100, 80
Notice that the weight for
chips got worse!
Price of meal = 500
 50         50              50
portions
of fish
portions
of chips
portions
of beer