Add KD distributed recipe

[lindawangg]

Context

What is the purpose of this PR? Is it to

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

To enable distributed training for knowledge distillation.

Changelog

What are the changes made in this PR?

• Builds on top of https://github.com/pytorch/torchtune/pull/1539
• KD distributed recipe (knowledge_distillation_distributed.py) is similar to lora_finetune_distributed.py.
• KD config: knowledge_distillation_distributed.yaml

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.

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

tune run --nodes 1 --nproc_per_node 2 knowledge_distillation_distributed --config qwen2/knowledge_distillation_distributed

(left) single device (right) distributed, can also increase batch size Similar eval results

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
• [x] I have added an example to docs or docstrings

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1631

• :page_facing_up: Preview Python docs built from this PR

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

:white_check_mark: No Failures

As of commit cf5f01a062856a6fe135102e68698cae907da31a with merge base d3039da900dbc5712ecb1f660ccf471cdcf8d107 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[felipemello1]

Hey @lindawangg , thanks for the recipe!! We have been a bit busy, but we will get to this PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 5.65111% with 384 lines in your changes missing coverage. Please review.

Project coverage is 68.70%. Comparing base (23c8829) to head (cf5f01a). Report is 386 commits behind head on main.

Files with missing lines	Patch %	Lines
recipes/knowledge_distillation_distributed.py	0.00%	313 Missing :warning:
...recipes/test_knowledge_distillation_distributed.py	24.46%	71 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1631      +/-   ##
==========================================
- Coverage   70.44%   68.70%   -1.74%     
==========================================
  Files         308      306       -2     
  Lines       16270    16596     +326     
==========================================
- Hits        11462    11403      -59     
- Misses       4808     5193     +385     

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