[WIP] Free generation for evals

[joecummings]

Context

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

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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 not sure about any one of these just ask and we will happily help.)

• 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.)

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/928

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❌ 13 New Failures

As of commit 7721ef4 with merge base f5b8eaf ():

NEW FAILURES - The following jobs have failed:

• Lint / lint (3.10) (gh)
  torchtune/utils/quantization.py:18:1: F811 redefinition of unused 'TORCH_VERSION_AFTER_2_3' from line 16
• Multi-GPU Recipe Tests / recipe_test_multi_gpu (3.10, stable) (gh)
  tests/recipes/test_lora_finetune_single_device.py::TestLoRAFinetuneSingleDeviceRecipe::test_save_and_load_merged_weights
• Multi-GPU Recipe Tests / recipe_test_multi_gpu (3.11, stable) (gh)
  ##[error]The operation was canceled.
• Multi-GPU Recipe Tests / recipe_test_multi_gpu (3.8, stable) (gh)
  ##[error]The operation was canceled.
• Multi-GPU Recipe Tests / recipe_test_multi_gpu (3.9, stable) (gh)
  ##[error]The operation was canceled.
• Recipe Tests / recipe_test (3.10) (gh)
  tests/recipes/test_lora_finetune_single_device.py::TestLoRAFinetuneSingleDeviceRecipe::test_save_and_load_merged_weights
• Recipe Tests / recipe_test (3.11) (gh)
  ##[error]The operation was canceled.
• Recipe Tests / recipe_test (3.8) (gh)
  ##[error]The operation was canceled.
• Recipe Tests / recipe_test (3.9) (gh)
  ##[error]The operation was canceled.
• Unit Test / unit_tests (3.10) (gh)
  tests/torchtune/utils/test_generation.py::TestTextGenerate::test_batched_generate_with_stop_tokens
• Unit Test / unit_tests (3.11) (gh)
  tests/torchtune/utils/test_generation.py::TestTextGenerate::test_batched_generate_with_stop_tokens
• Unit Test / unit_tests (3.8) (gh)
  ##[error]The operation was canceled.
• Unit Test / unit_tests (3.9) (gh)
  ##[error]The operation was canceled.

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