Implementation of Marginal Ranking Loss Function

[jkauerl]

Pull Request Template

Description

PR including the implementation for the Marginal Ranking Loss Function of this issue #559 . It creates a new file called marginal_ranking.rs with the function called mrg_ranking_loss. This implementation is inspired on the documentation of PyTorch of Marginal Ranking.

Type of change

• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [ ] I ran bellow commands using the latest version of rust nightly.
• [x] I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• [x] I ran cargo fmt just before my last commit.
• [x] I ran cargo test just before my last commit and all tests passed.
• [x] I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• [x] I added my algorithm to DIRECTORY.md with the correct link.
• [x] I checked COUNTRIBUTING.md and my code follows its guidelines.

PD: Im new to Rust and Open Source so I would love a clarification regarding the items I did not checked. Also let me know if I should squash the commits. Last PR had a wrong branch name #733.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.03%. Comparing base (1d9c510) to head (2fe3de7). Report is 5 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #742 +/- ## ========================================== + Coverage 94.95% 95.03% +0.08% ========================================== Files 303 304 +1 Lines 22533 22638 +105 ========================================== + Hits 21396 21515 +119 + Misses 1137 1123 -14 ```

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