scipy/scipy — pull request #3263 by larsmans (2014-02-01 12:12:39+00:00)
Title: DOC: special: note that expit is aka the logistic

I only found this function, which I reimplemented several times (using `tanh`) when I noticed the word "logit" popping up in build output; machine learning literature invariably calls this the logistic rather than the expit. [MathWorld](http://mathworld.wolfram.com/SigmoidFunction.html) doesn't mention expit either.