pyro-ppl / numpyro / 39157857612

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fix(distributions): include zero in the support of hurdles over positive bases (#2364)

HurdleProbs passed the base support through unchanged, so a generic
HurdleDistribution over Gamma, Exponential, Weibull, etc. declared (0, inf)
and, with validation on by default, returned -inf for the zeros it samples
with probability gate, so models observing zeros failed to initialize. Map a
positive base support to nonnegative, as HurdleGamma and HurdleLogNormal do.

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