DPO Activation Offloading

[SalmanMohammadi]

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.
Closes #2083

Changelog

What are the changes made in this PR?

• Adds activation offloading to single and distributed DPO recipes.
• Adds configs for Llama3.1 8B.

Single device WandB link: https://wandb.ai/salman-mohammadi/dpo_act_off
Distributed: https://wandb.ai/salman-mohammadi/dpo_act_off_dist

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/2087

• 📄 Preview Python docs built from this PR

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

✅ No Failures

As of commit 770f1e9 with merge base d923234 ():
💚 Looks good so far! There are no failures yet. 💚

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[joecummings]

Add run output for the Llama3.1 8B configs and I'll stamp

[SalmanMohammadi]

Add run output for the Llama3.1 8B configs and I'll stamp

It's in the wandb links!

[joecummings]

buenisimo