Allow to access fx from jac_cache via public API

[codecov-commenter]

Codecov Report

Base: 81.44% // Head: 0.22% // Decreases project coverage by -81.21% :warning:

Coverage data is based on head (023c741) compared to base (7f00964). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #210 +/- ## ========================================== - Coverage 81.44% 0.22% -81.22% ========================================== Files 15 15 Lines 900 887 -13 ========================================== - Hits 733 2 -731 - Misses 167 885 +718 ``` | [Impacted Files](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff) | Coverage Δ | | |---|---|---| | [src/SparseDiffTools.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL1NwYXJzZURpZmZUb29scy5qbA==) | `40.00% <ø> (-60.00%)` | :arrow_down: | | [src/differentiation/compute\_jacobian\_ad.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2RpZmZlcmVudGlhdGlvbi9jb21wdXRlX2phY29iaWFuX2FkLmps) | `0.00% <0.00%> (-90.46%)` | :arrow_down: | | [src/coloring/high\_level.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvbG9yaW5nL2hpZ2hfbGV2ZWwuamw=) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/coloring/matrix2graph.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvbG9yaW5nL21hdHJpeDJncmFwaC5qbA==) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/coloring/greedy\_d1\_coloring.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvbG9yaW5nL2dyZWVkeV9kMV9jb2xvcmluZy5qbA==) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/coloring/contraction\_coloring.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvbG9yaW5nL2NvbnRyYWN0aW9uX2NvbG9yaW5nLmps) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/coloring/greedy\_star1\_coloring.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvbG9yaW5nL2dyZWVkeV9zdGFyMV9jb2xvcmluZy5qbA==) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/coloring/greedy\_star2\_coloring.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2NvbG9yaW5nL2dyZWVkeV9zdGFyMl9jb2xvcmluZy5qbA==) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/differentiation/compute\_hessian\_ad.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2RpZmZlcmVudGlhdGlvbi9jb21wdXRlX2hlc3NpYW5fYWQuamw=) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | [src/differentiation/jaches\_products\_zygote.jl](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff#diff-c3JjL2RpZmZlcmVudGlhdGlvbi9qYWNoZXNfcHJvZHVjdHNfenlnb3RlLmps) | `0.00% <0.00%> (-100.00%)` | :arrow_down: | | ... and [4 more](https://codecov.io/gh/JuliaDiff/SparseDiffTools.jl/pull/210/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDiff)

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[j-fu]

:+1: