[source] # Sigmoid A bounded S-shaped function (sometimes called the *Logistic* function) with an output value between 0 and 1. The output of the sigmoid function has the advantage of being interpretable as a probability, however it is not zero-centered and tends to saturate if inputs become large. $$ {\displaystyle Sigmoid = {\frac {1}{1+e^{-x}}}} $$ ## Parameters This activation function does not have any parameters. ## Example ```php use Rubix\ML\NeuralNet\ActivationFunctions\Sigmoid; $activationFunction = new Sigmoid(); ```