Fix FoldedDistribution conditioning behavior #138
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Extracted from #130. Blocking #130 #131 #132 #133 #134
This PR fixes an edge case that came up in #130:
FoldedDistributions are subclasses ofTransformedDistributionin Pyro, but theTransforms they use don't implement inversion so they aren't compatible with the logic for standardTransformedDistributions incausal_pyro.counterfactual.handlers.ambiguity.This bug is not specific to
FoldedDistribution, but because PyTorchDistributions andTransforms are so resistant to introspection it has to be dealt with case-by-case. I'm adding the fix for this case now because it is blocking #10.