Sigmoid function

A Gentle Introduction To Sigmoid Function


Sigma notation

Etymology

Sigmoid = s shaped (or σ-shaped)

It's an s shaped function returning values between 1 and 0.
Its domain is $-\infty$ and $\infty$.

It makes it useful as a squashing function, compressing values between 0 and 1.

It's also used as an activation function in Neural Networks

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