* Remove NodeTrait

* Changelog

* Fix exports

* docs

* fix a bug

* Fix doctests

* Fix test

* tweak changelog

* Fast Log Density Function

* Make it work with AD

* Optimise performance for identity VarNames

* Mark `get_range_and_linked` as having zero derivative

* Update comment

* make AD testing / benchmarking use FastLDF

* Fix tests

* Optimise away `make_evaluate_args_and_kwargs`

* const func annotation

* Disable benchmarks on non-typed-Metadata-VarInfo

* Fix `_evaluate!!` correctly to handle submodels

* Actually fix submodel evaluate

* Document thoroughly and organise code

* Support more VarInfos, make it thread-safe (?)

* fix bug in parsing ranges from metadata/VNV

* Fix get_param_eltype for TSVI

* Disable Enzyme benchmark

* Don't override _evaluate!!, that breaks ForwardDiff (sometimes)

* Move FastLDF to experimental for now

* Fix imports, add tests, etc

* More test fixes

* Fix imports / tests

* Remove AbstractFastEvalContext

* Changelog and patch bump

* Add correctness tests, fix imports

* Concretise parameter vector in tests

* Add zero-allocation tests

* Add Chairmarks as test dep

* Disable allocations tests on multi-threaded

* Fast InitContext (#1125)

* Make InitContext work with OnlyAccsVarInfo

* Do not convert NamedTuple to Dict

* remove logging

* Enable InitFromPrior and InitFromUniform too

* Fix `infer_nested_eltype` invocation

* Refactor FastLDF to use InitContext

* note init breaking change

* fix logjac sign

* workaround Mooncake segfault

* fix changelog too

* Fix get_param_eltype for context stacks

* Add a test for threaded observe

* Export init

* Remove dead code

* fix transforms for pathological distributions

* Tidy up loads of things

* fix typed_identity spelling

* fix definition order

* Improve docstrings

* Remove stray comment

* export get_param_eltype (unfortunatley)

* Add more comment

* Update comment

* Remove inlines, fix OAVI docstring

* Improve docstrings

* Simplify InitFromParams constructor

* Replace map(identity, x[:]) with [i for i in x[:]]

* Simplify implementation for InitContext/OAVI

* Add another model to allocation tests

Co-authored-by: Markus Hauru <[email protected]>

* Revert removal of dist argument (oops)

* Format

* Update some outdated bits of FastLDF docstring

* remove underscores

---------

Co-authored-by: Markus Hauru <[email protected]>

* print output

* fix

* reenable

* add more lines to guide the eye

* reorder table

* print tgrad / trel as well

* forgot this type

… and also `bundle_samples` (#1129)

* Implement `ParamsWithStats` for `FastLDF`

* Add comments

* Implement `bundle_samples` for ParamsWithStats -> MCMCChains

* Remove redundant comment

* don't need Statistics?

* Make FastLDF the default

* Add miscellaneous LogDensityProblems tests

* Use `init!!` instead of `fast_evaluate!!`

* Rename files, rebalance tests

…o` (#1130)

* Use OnlyAccsVarInfo for many re-evaluation functions

* drop `fast_` prefix

* Add a changelog

Co-authored-by: Penelope Yong <[email protected]>

Co-authored-by: Penelope Yong <[email protected]>

Co-authored-by: Penelope Yong <[email protected]>

I also split up `varnamedtuple.jl` because it's just massive.

Also reorganised a bunch of code and deduplicated method names. Anything
that takes an optic is called `_foo_optic` (where `foo` is one of
`getindex`, `setindex` and `haskey`). That frees us up to use the
original `Base.getindex`, `BangBang.setindex!!`, and `Base.haskey` for
methods that take a plain old list of indices.'

Note that this breaks a few tests. For example, colon indices are
broken, because colons are always unconcretised now. Unfortunately,
there's no way of fixing this _properly_ without #1194. However, we
_could_ replicate the old concretisation mechanism of colons in
DynamicPPL, which would make them continue to work (at least for now).

This PR disables colon tests for the time being.