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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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End.<br />

For i:= 1 to n do<br />

Begin<br />

For j:= 1 to n do<br />

Begin<br />

−<br />

~<br />

If X wk,<br />

l<br />

∼<br />

=<br />

⎡<br />

⎤<br />

⎢<br />

⎥<br />

⎢<br />

Min X − w<br />

j < n 1≤<br />

j<<br />

n ∼ ⎥<br />

⎣ ~ ⎦<br />

Min ij<br />

1≤<br />

Then Adjust weights of neighboring neurons of Nk,l<br />

by the following rule:<br />

For i':= (k − δ) to (k + δ) do<br />

Begin<br />

For j':= (l − δ) to (l + δ) do<br />

Begin<br />

~<br />

( t 1) w () t X − w () t<br />

'<br />

i',<br />

j'<br />

i',<br />

'<br />

+ = + α<br />

~<br />

~<br />

wi ' , j<br />

~ j<br />

End For;<br />

End For;<br />

δ := δ − ε; // Space-organization //<br />

End For;<br />

End For;<br />

Until δ ≤ pre-assigned quantity;<br />

The above algorithm should be repeated for all input patterns.<br />

Consequently, all the input patterns will be mapped on the 2-D plane as a ndimensional<br />

point, each having a<br />

∼ ij w .<br />

14.11 Adaptive Resonance Theory (ART)<br />

Another unsupervised class of learning, which takes into account the stability<br />

[3] of the previously learnt pattern classes <strong>and</strong> plasticity [4] of storing a new<br />

pattern class, is the ART network model, proposed by Carpenter <strong>and</strong><br />

Grossberg [3]. It is a two-layered network, where the input layer transforms<br />

the received new pattern ( ∼ X ) into state vector ( ∼ V ) with the help of stored<br />

patterns ( ∼ O), <strong>and</strong> the output layer identifies a weight vector ( ∼<br />

_<br />

W) among a<br />

stored set of competitive weight vectors ( W). The new states Vj, which are<br />

∼<br />

components of V , are given by<br />

∼<br />

_

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