Include resampling over (kappa+alpha) and rho=kappa/(kappa+alpha) in WeakLimitStickyHDPHMM#98

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NickHoernle wants to merge 2 commits intomattjj:masterfrom NickHoernle:master

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Commits on Jun 5, 2019

update models to allow resampling over ALL hyperparameters (alpha, gamma and kappa). The hyperparameters are reparameterised to (kappa+alpha) and rho=kappa/(alpha+kappa). transitions.py the new "Fu…
NickHoernle
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namedtuple solution for rho was not good. Updated to rather use a dictionary to hold the hyperparameters and the probability value. Possible need for neater update
NickHoernle
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