Solved-Assignment 8 -Solution

Description

1. [4 points] Briefly compare neurons used in a) perceptron-type networks and b) RBF-type networks. [Hint: concentrate on what they compare, how tot is calculated, and how neuron output is determined]

2. [6 points] Consider the modified Hebbian learning rule

w new = w old (1 − α)+ hx o
j
ij ij i

and assume the following values xi = oj = 1, learning rate = 1, forgetting factor = 0.1, and initial

old = 0 .
weight wij

a) Compare standard ( learning steps (i.e. plot

= 0) and modified Hebbian learning by plotting weights over 30 subsequent
new as a function of time) using the parameters provided.
wij

b) Determine maximum value of weight w that can be obtained by modified Hebbian learning using the

parameters provided [Hint: in the limit case, the values of

w new

ij

and

w old

ij

would be identical].