Function: sigmoidTSL()
sigmoidTSL(
xNode):any
Plain logistic sigmoid, 1 / (1 + e^-x) - factored out since every
sigmoid-shaped output nonlinearity in this codebase (channel activations
here, neural-appearance's roughness/opacity/scaledSigmoid outputs in
../neural-appearance/NeuralAppearanceTSL.js) is this same formula.
Parameters
xNode
any
Returns
any