Speed up core.prior classes

To solve issue #416 (closed)

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• 000a24e1 - Changed prob() in StudentT to a more stable expression

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• cba8c7c0 - Removed unused function

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@gregory.ashton Before someone else approves, I found out that Beta is also using scipy, just was buried so that I didn't catch it before.

And a second thing, the current Beta prob() and ln_prob() have bugs I think. Specifically it's line 1911 and 1912 for prob() in prior.py. And also a similar issue in ln_prob().

a) it's not returning pdf, but returning spdf. So it's not taking out the infinities.

b) it's buggy because of this spdf[np.isfinite].

Working on changing it now.

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• 52e9331a - Code changes and added test for core.prior.Beta

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Great, thanks @liting.xiao this looks ready to go. Nice work!

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changed milestone to %0.6.0

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changed milestone to %0.5.9

mentioned in commit c1984e43

merged

mentioned in issue #416 (closed)

mentioned in merge request !332 (merged)