Technically, you can say that even a single perceptron unit is a artificial neural network -- a single-layer ANN. Multi-layer neural networks (such as a multi-l

Technically, you can say that even a single perceptron unit is a artificial neural network -- a single-layer ANN. Multi-layer neural networks (such as a multi-layer perceptron) have at least one input layer, one hidden layer, and one output layer.