[WIP] MM Eval tests

[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.

Changelog

What are the changes made in this PR?
*

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

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and a tutorial example

• I did not change any public API
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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1887

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 63ba175 with merge base 1e5f0d5 ():

NEW FAILURE - The following job has failed:

• Lint / lint (3.10) (gh)
  ##[error]Process completed with exit code 1.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

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

BROKEN TRUNK - The following job failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Recipe Tests / recipe_test (3.11) (gh) (trunk failure)
  ##[error]The operation was canceled.

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