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Assignment 8 Solution

[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



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].

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