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==Training==
RBF networks are typically trained from pairs of input and target values <math>\mathbf{x}(t), y(t)</math>, <math>t = 1, \dots, T</math> by a two-step algorithm.
In the first step, the center vectors <math>\mathbf c_i</math> of the RBF functions in the hidden layer are chosen. This step can be performed in several ways; centers can be randomly sampled from some set of examples, or they can be determined using [[k-means clustering]]. Note that this step is [[unsupervised learning|unsupervised]].
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