Move SFGS, CSG and Elliptical Slice samplers to pymc3-experiments

[twiecki]

These three samplers are not well supported and do not appear to really be used. They are mostly experimental and should be in the main software. Thus, they should be moved to https://github.com/pymc-devs/pymc3-experimental alongside any tests and docs (tests and docs do not need to compile/function). If someone picks them up and demonstrates their usefulness they can certainly make their way back, but they have lied dormant for too long.

[Akamoha]

So this would mean removing all the work done in #2544?

[twiecki]

@Akamoha Yes, alongside the SFGS.

[eigenfoo]

#3233 and #3357 are both problems to do with the CSG sampler. Is the plan to simply remove CSG altogether? If so, then perhaps we should close those issues.

[junpenglao]

Could we move to a new repo maybe? (pymc-devs/experiment?) Along with Elliptical Slice Sampling.

[twiecki]

@junpenglao I like that.

[twiecki]

I created https://github.com/pymc-devs/pymc3-experimental.

[junpenglao]

Awesome ;-)

[junpenglao]

I can finally dump all my codes on Laplace approximation etc there :-|||||

[twiecki]

@Akamoha Do you want to take this one on?

[harshitbansal05]

hey, @twiecki can I work on this one?

[twiecki]

Yes! thank you for volunteering.

…

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[fonnesbeck]

ESS should not be experimental, and is useful for GPs. One of the demo notebooks uses it.