Implement Kumaraswamy distribution

[alicanb]

I'm in process of refactoring probtorch to use pytorch distributions, Kumaraswamy is the only distribution that we have missing in pytorch.

[vishwakftw]

If we finish PowerTransform, this should be simple. From Wikipedia:

X ~ U[0, 1] , then Y = (1 - (1 - X).pow(1/a)).pow(1/b)) ~ Kumaraswamy(a, b)

[vishwakftw]

Shall I submit a PR with Kumaraswamy Distribution?

[alicanb]

Sure, thanks for doing it!

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