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With ChangesOfVariables.jl we now have a standard for how to express transforms with log-abs-det-jacbian values, supported by central packages like LogExpFunctions.jl, as well as TransformVariables.jl, Bijectors.jl and others.
Transforms like AffineTransform
ideally use ChangesOfVariables.with_logabsdet_jacobian
as their primary LADJ-handling mechanism. This could also gradually reduce dependencies on TransformVariables.jl in the code.
Pushforward
(should move into MeasureBase, see JuliaMath/MeasureBase.jl#54) wouldn't need the logjac::L
field anymore (with_logabsdet_jacobian
now can test if an LADJ-definition exists).
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