[EZ] Fix config bug where interpolation happens too early

[EugenHotaj]

There is currently a bug in config interpolation. E.g. given the following config:

name: REPLACE_ME
output_dir: ${name}/logs

When overriding name=some-override via the CLI, the expected config should be:

name: some-override
output_dir: some-override/logs

However, instead we get:

name: some-override
output_dir: REPLACE_ME/logs

This happens because OmegaConf resolves values under the hood when you try to access them.

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❌ 2 New Failures, 4 Cancelled Jobs

As of commit 3bf3c9d with merge base 27fd3a1 ():

NEW FAILURES - The following jobs have failed:

• GPU tests / gpu_test (3.11, stable) (gh)
  tests/torchtune/config/test_parse.py::TestArgParse::test_parse_known_args
• Unit Test / unit_tests (3.9) (gh)
  tests/torchtune/config/test_parse.py::TestArgParse::test_parse_known_args

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

• GPU tests / gpu_test (3.10, stable) (gh)
  tests/torchtune/config/test_parse.py::TestArgParse::test_parse_known_args
• GPU tests / gpu_test (3.9, stable) (gh)
  tests/torchtune/config/test_parse.py::TestArgParse::test_parse_known_args
• Unit Test / unit_tests (3.10) (gh)
  ##[error]The operation was canceled.
• Unit Test / unit_tests (3.11) (gh)
  ##[error]The operation was canceled.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 23.95%. Comparing base (213f386) to head (3bf3c9d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
torchtune/config/_parse.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (213f386) and HEAD (3bf3c9d). Click for more details.

HEAD has 8 uploads less than BASE

Flag	BASE (213f386)	HEAD (3bf3c9d)
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Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2236       +/-   ##
===========================================
- Coverage   65.41%   23.95%   -41.47%     
===========================================
  Files         344      352        +8     
  Lines       20658    20847      +189     
===========================================
- Hits        13514     4993     -8521     
- Misses       7144    15854     +8710     

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[RdoubleA]

This is a great catch. You may need to update the unit tests to make sure the mock value returned by OmegaConf.load is an OmegaConf object. Would you also be able to modify test_parse_known_args in tests/torchtune/config/test_parse.py to test for this edge case?