feat(model,eval) DPO training & human preference eval

[BobbyL2k]

Why this PR

This PR adds DPO training scripts and human preference evaluation notebook to repo

Changes

Added DPO training scripts and human preference evaluation notebook

Related Issues

Close #

Checklist

• PR should be in the Naming convention
• Assign yourself in to Assigneees
• Tag related issues
• Constants name should be ALL_CAPITAL, function name should be snake_case, and class name should be CamelCase
• complex function/algorithm should have Docstring
• 1 PR should not have more than 200 lines changes (Exception for test files). If more than that please open multiple PRs
• At least PR reviewer must come from the task's team (model, eval, data)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5fbee96) 64.16% compared to head (54425cb) 19.39%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #338       +/-   ##
===========================================
- Coverage   64.16%   19.39%   -44.78%     
===========================================
  Files          11       25       +14     
  Lines         427     1392      +965     
===========================================
- Hits          274      270        -4     
- Misses        153     1122      +969     

Flag	Coverage Δ
unittests	19.39% <ø> (-44.78%)	⬇️

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