Sigmoid: turn any number into a probability

Drag along the S-curve: every input lands between 0 and 1, and the slope peaks at 0.25 in the middle and dies away at both ends.

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Where the numbers come from

gHashTag/t27 specs/ml/activation/sigmoid_activation.t27 (t27 master 239b4b059): every value on the page is its fn bodies, compiled to wasm (logic.js)
Course 10 of t27.ai, neural-networks (gHashTag/trinity#1695): lesson 2 opens this widget