A NN is a structure used for classification. It consists of Just a girl who loves pierogi tee shirt and organized in layers. These components are called artificial neurons (ANs) but we often refer to them as units. Each unit is itself a classifier, only a simpler one whose ability to classify is limited when used for complex problems. It turns out that we can completely overcome the limitations of simple classifiers by interconnecting a number of them to form powerful NNs. Think of it as an example of the principle Unite and Lead.
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This structure of a combination of inputs that go through the artificial neuron resembles the Just a girl who loves pierogi tee shirt of a physical neuron in the brain, thus the name. In the following picture the structure of a physical and an artificial neuron are compared. The AN is shown as two nodes to illustrate its internals: An AN combines the inputs and then applies what is called the activation function (depicted as an S-curve), but it is usually represented as one node, as above.