Feature: learning subpackage unit tests + docs changes

[rushilg99]

No description provided.

[codecov]

Codecov Report

Merging #1297 (e597a80) into develop (9302366) will increase coverage by 4.39%.
Report is 1 commits behind head on develop.
The diff coverage is 71.23%.

❗ Current head e597a80 differs from pull request most recent head e71f6cc. Consider uploading reports for the commit e71f6cc to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1297      +/-   ##
===========================================
+ Coverage    73.59%   77.99%   +4.39%     
===========================================
  Files           62       62              
  Lines         5689     5744      +55     
===========================================
+ Hits          4187     4480     +293     
+ Misses        1502     1264     -238     

Files	Coverage Δ
macrosynergy/signal/signal_return_relations.py	88.08% <100.00%> (ø)
macrosynergy/learning/transformers.py	80.78% <83.33%> (+64.52%)	⬆️
macrosynergy/learning/signal_optimizer.py	52.44% <53.33%> (+42.92%)	⬆️
macrosynergy/learning/panel_time_series_split.py	58.85% <50.00%> (-0.78%)	⬇️

... and 2 files with indirect coverage changes