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Sigmoid

"Sigmoid" means resembling the letter S or the lower-case Greek letter sigma (ς).

In a neural network, the sigmoid function is used to add nonlinearity. A bounded sigmoid function is the hyperbolic tangent function, or this translated to the range (0,1); an unbounded sigmoid function is the inverse hyperbolic cosine function.

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... and possibly bishop of Croton. In approximately 580, he wrote "De origine actibusque Getarum[?]" (The origin and deeds of the Goths), "De breviatione chronicorum" ...