Distribution flatten/unflatten: Do not sort attrs. #1509
Merged
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Currently,
Distribution.tree_flatten
sorts distribution attrs alphabetically, so the order is sometimes different from what is declared in the definition, e.g. the beta distributionBeta(concentration1, concentration0).tree_flatten() = (concentration0, concentration1)
. With this PR, attrs are used in the same order as declared withinDistribution.arg_constraints
.