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. 2020 Jan 10;38(10):2349–2358. doi: 10.1007/s00345-019-03059-0

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© The Author(s) 2020

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Fig. 1 — Multilayer perceptron with input and output layer as well as an additional hidden unit layer. The neurons of a layer are represented as unfilled blue circles, and the completely colored neurons are the so-called bias neurons, whose value is constant and does not depend on the activations in previous layers. The weights of the compounds are learned in training (Source: [1])