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v2.7.0-rc2

@pytorchbot pytorchbot tagged this 13 Mar 16:28
Remove runtime dependency on packaging (#149092)

Looks like after https://github.com/pytorch/pytorch/pull/148924
We are seeing this error in nightly test:
https://github.com/pytorch/pytorch/actions/runs/13806023728/job/38616861623

```
  File "/Users/runner/work/_temp/anaconda/envs/test_conda_env/lib/python3.13/site-packages/torch/_inductor/pattern_matcher.py", line 79, in <module>
    from .lowering import fallback_node_due_to_unsupported_type
  File "/Users/runner/work/_temp/anaconda/envs/test_conda_env/lib/python3.13/site-packages/torch/_inductor/lowering.py", line 7024, in <module>
    from . import kernel
  File "/Users/runner/work/_temp/anaconda/envs/test_conda_env/lib/python3.13/site-packages/torch/_inductor/kernel/__init__.py", line 1, in <module>
    from . import mm, mm_common, mm_plus_mm
  File "/Users/runner/work/_temp/anaconda/envs/test_conda_env/lib/python3.13/site-packages/torch/_inductor/kernel/mm.py", line 6, in <module>
    from packaging.version import Version
ModuleNotFoundError: No module named 'packaging'
```

Hence removing runtime dependency on packaging since it may not be installed by default

Pull Request resolved: https://github.com/pytorch/pytorch/pull/149092
Approved by: https://github.com/drisspg, https://github.com/davidberard98

(cherry picked from commit 65d19a5699afbb0b123b6b264188f5610b925c5e)

Co-authored-by: atalman <atalman@fb.com>
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