Added ranking losses

[Mayureshd-18]

Closes: #32

• Title : Add ranking losses in ML algorithms
• Name: Mayuresh Dharwadkar
• Idenitfy yourself: SSOC

Describe the add-ons or changes you've made 📃

Give a clear description of what have you added or modifications made
Add ranking losses in ML algorithms:

1. Pairwise ranking loss
2. Triplet loss

Type of change ☑️

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested? ⚙️

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Screenshots 📷

Note to reviewers 📄

[github-actions]

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[Avdhesh-Varshney]

@Mayureshd-18 pr can't approved. because,

• you have to create your seprate branch for the pr
• for next pr, carefully link your issue with pr
• Folder name should be in CamelCase no spacing and first letter of word is capital
• enlist these algorithms in ml folder readme file