Generic cdf and icdf implementation for scalar TransformedDistributions.
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…mplementation for `TransformedDistribution`s.
tillahoffmann
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This PR
signattribute toTransformwhich is the sign of the derivative for bijective scalar transforms. This matches thesignattribute of transforms in Pyro.cdfforTransformedDistributionby transforming from the domain of the transformed distribution to the domain of the base distribution and evaluating the cdf.icdfforTransformedDistributionby callingicdfof the base distribution and applying the transforms.This means cdfs for
LogNormal,InverseGamma,LogUniform, andParetodo not require a custom implementation. As a side effect, this PR addsicdfsupport forLogNormal,InverseGamma, andLogUniform; it also addscdfandicdfsupport forRelaxedBernoulliLogits.