[Numpy-discussion] ENH: softmax

[Hameer Abbasi]

I possible, write it as a `gufunc`, so duck arrays can override with
`__array_ufunc__` if

necessary. -- Marten

Softmax is a very simple combination of elementary `ufunc`s with two
inputs, the weight vector `w` and the data `x`. Writing it as a `gufunc`
would be going overboard, IMO. Writing it as a combination of `ufunc`s and
avoiding Numpy-specific stuff should be good enough.
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