Attempt to make the reward function customizable in GRPO

[imenelydiaker]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• other (please add here)

Please link to any issues this PR addresses.

Changelog

What are the changes made in this PR?

• Attempt to make the reward function customizable in GRPO implementation following issue GRPO Improvement checklist #2421

Test plan

Please make sure to do each of the following if applicable to your PR. If you're unsure about any one of these just ask and we will happily help. We also have a contributing page for some guidance on contributing.

• run pre-commit hooks and linters (make sure you've first installed via pre-commit install)
• add unit tests for any new functionality
• update docstrings for any new or updated methods or classes
• run unit tests via pytest tests
• run recipe tests via pytest tests -m integration_test
• manually run any new or modified recipes with sufficient proof of correctness
• include relevant commands and any other artifacts in this summary (pastes of loss curves, eval results, etc.)

UX

If your function changed a public API, please add a dummy example of what the user experience will look like when calling it.
Here is a docstring example
and a tutorial example

• I did not change any public API
• I have added an example to docs or docstrings

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/2433

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 New Failures, 2 Cancelled Jobs

As of commit 075b500 with merge base fe17fad ():

NEW FAILURES - The following jobs have failed:

• Lint / lint (3.10) (gh)
  Process completed with exit code 1.
• Recipe Tests / recipe_test (3.11) (gh)
  tests/recipes/test_eleuther_eval.py::TestEleutherEval::test_torchtune_checkpoint_eval_results[truthfulqa_mc2-0.4-4]

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Recipe Tests / recipe_test (3.10) (gh)
  ##[error]The operation was canceled.
• Recipe Tests / recipe_test (3.9) (gh)
  ##[error]The operation was canceled.

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[joecummings]

Could you run the recipe and paste the output (from either disk logging or Weights & Biases output) in the PR description as a confirmation that this works?

In addition, you probably need to run the linter.