1D marginals

[gmoss13]

Added functions to plot just the 1D marginals. Using same interface as pairplot functions.

[janfb]

Thanks for tackling this, looks great!

I added some comments about black and isort and I have two high level comments / questions: 1) why do we separate the code into the analysis module and the utils module? 2) we now have a lot of code repetition between marginal_plot and pairplot, e.g., how the limits are set up, how the diag_fun is built. Whenever there is such a repetition I think it makes sense to outsource the code to a function, which is then called by pairplot and marginal_plot, i.e., a function get_limits(samples...) and a function get_diag_fun(samples...) -> Callable.

Let's discuss this later in the meeting.

[codecov-commenter]

Codecov Report

Merging #600 (222bd1f) into main (0800e8b) will decrease coverage by 0.27%.
The diff coverage is 45.42%.

@@            Coverage Diff             @@
##             main     #600      +/-   ##
==========================================
- Coverage   66.94%   66.67%   -0.28%     
==========================================
  Files          67       66       -1     
  Lines        4251     4267      +16     
==========================================
- Hits         2846     2845       -1     
- Misses       1405     1422      +17     

Flag	Coverage Δ
unittests	66.67% <45.42%> (-0.28%)	⬇️

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Impacted Files	Coverage Δ
sbi/analysis/sensitivity_analysis.py	15.48% <0.00%> (ø)
sbi/utils/sbiutils.py	76.32% <ø> (ø)
sbi/analysis/plot.py	46.00% <44.63%> (-34.00%)	⬇️
sbi/analysis/__init__.py	100.00% <100.00%> (ø)
sbi/inference/base.py	77.53% <100.00%> (ø)
sbi/utils/__init__.py	100.00% <100.00%> (ø)
sbi/utils/tensorboard_output.py	86.25% <100.00%> (ø)

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[gmoss13]

Everything is added and refactored now - only question is do we want the keywords passed to 1D marginal plots to keep the "diag" terminology for consistency, or change it to something like "col"?

Also need to add some comments to new functions.

[janfb]

Looks great, thanks! I added small comments and it needs a rebase on main to resolve some small conflicts.