Add multilayer perceptron.

giserh · Dec 20, 2018 · 77753fe · 77753fe
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diff --git a/homemade/neural_network/README.md b/homemade/neural_network/README.md
@@ -20,6 +20,8 @@ In common ANN implementations, the signal at a connection between artificial neu
 
 ![Neural Network](https://upload.wikimedia.org/wikipedia/commons/4/46/Colored_neural_network.svg)
 
+A **multilayer perceptron (MLP)** is a class of feedforward artificial neural network. An MLP consists of, at least, three layers of nodes: an input layer, a hidden layer and an output layer. Except for the input nodes, each node is a neuron that uses a nonlinear activation function. MLP utilizes a supervised learning technique called backpropagation for training. Its multiple layers and non-linear activation distinguish MLP from a linear perceptron. It can distinguish data that is not linearly separable.
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 ## Neuron Model (Logistic Unit)
 
 Here is a model of one neuron unit.