There are several network structures that can be followed to describe a net-
work model. Two main categories of network structures are feed-forward
and feedback architectures. In a feed-forward neural network, the signal
propagates forward from nodes in a layer to the next nodes without any
feedback, as shown in Figure 6.4. The nodes of the next layer use the values
produced by the previous layer as their input values. On the other hand, the
feedback network model allows the signals to come back to the previous
nodes as shown in Figure 6.5. Many feedback neural networks ...
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