As mentioned before, several types of neural nets exist.
They can be distinguished by
» their structure
» and the learning algorithm they use.
The type of a neural net indicates, if the neurons of one of the net's layers may be connected among each other. Feedforward neural nets allow only neuron connections between two different layers, while nets of the feedback type have also connections between neurons of the same layer.
In this section, a selection of neural nets will be described.