add function retrieval_precision and unit tests

[DamienAllonsius]

Summary: Implement retrieval_precision function

Reviewed By: bobakfb

Differential Revision: D44752024

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D44752024

[codecov[bot]]

Codecov Report

Merging #151 (a1000e7) into main (6b48317) will increase coverage by 70.61%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main     #151       +/-   ##
===========================================
+ Coverage   24.99%   95.60%   +70.61%     
===========================================
  Files         172      174        +2     
  Lines        9814     9899       +85     
===========================================
+ Hits         2453     9464     +7011     
+ Misses       7361      435     -6926     

Impacted Files	Coverage Δ
torcheval/metrics/functional/__init__.py	100.00% <ø> (ø)
...ics/functional/ranking/test_retrieval_precision.py	100.00% <100.00%> (ø)
torcheval/metrics/functional/ranking/__init__.py	100.00% <100.00%> (ø)
.../metrics/functional/ranking/retrieval_precision.py	100.00% <100.00%> (ø)

... and 152 files with indirect coverage changes

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D44752024

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D44752024

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D44752024

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D44752024

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D44752024