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

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x 1<br />

x 2<br />

x n<br />

Penultimate<br />

layer<br />

∑+F<br />

Neuron p at<br />

layer (k-1)<br />

∑+F<br />

∑+F<br />

x 1<br />

x 2<br />

x n<br />

W pq, k<br />

Neuron q<br />

at layer k<br />

∑ wx i i<br />

Out p, j<br />

Net<br />

Output<br />

layer (k)<br />

F '<br />

Σ +<br />

F<br />

Net q, k<br />

F(1-F)<br />

δq, k<br />

∆Wp, q, k<br />

W p, q, k(n+1)<br />

F = − Net<br />

1<br />

Out<br />

Out q, k<br />

1<br />

+ e<br />

learning rate, η<br />

W p, q, k (n)<br />

Out<br />

error<br />

Fig. 14.6: Attributes of neurons <strong>and</strong> weight adjustments by the back-<br />

propagation learning algorithm.<br />

Net<br />

(a) A typical<br />

neuron used in<br />

Backpropagation<br />

algorithm<br />

(b) Schematic<br />

representation<br />

of the neuron<br />

shown in (a)<br />

desired<br />

(c) Training of a<br />

weight, W p,q,k at<br />

the output (k th )<br />

layer.

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