[BE]: Add better optional typing

[Skylion007]

Fixes #ISSUE_NUMBER

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @yf225 @chenyang78 @kadeng @muchulee8 @ColinPeppler @amjames @desertfire @chauhang @aakhundov @rec

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/138426

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✅ You can merge normally! (2 Unrelated Failures)

As of commit 9967394 with merge base 705f5b3 ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

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

• pull / cuda12.1-py3.10-gcc9-sm75 / test (pr_time_benchmarks, 1, 1, linux.g4dn.metal.nvidia.gpu) (gh) (trunk failure)
  ##[error]Process completed with exit code 1.
• trunk / linux-focal-rocm6.2-py3.10 / test (distributed, 1, 1, linux.rocm.gpu) (gh) (trunk failure)
  distributed/test_c10d_nccl.py::ProcessGroupNCCLGroupTest::test_extra_cuda_context

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[Skylion007]

@pytorchbot merge -r

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/viable/strict. Check the current status here

[pytorchmergebot]

Rebase failed due to Command git -C /home/runner/work/pytorch/pytorch rebase refs/remotes/origin/viable/strict pull/138426/head returned non-zero exit code 1

Rebasing (1/3)
Auto-merging torch/fx/proxy.py
CONFLICT (content): Merge conflict in torch/fx/proxy.py
Auto-merging torch/overrides.py
error: could not apply aba31c552d... [BE]: Add better optional typing
hint: Resolve all conflicts manually, mark them as resolved with
hint: "git add/rm <conflicted_files>", then run "git rebase --continue".
hint: You can instead skip this commit: run "git rebase --skip".
hint: To abort and get back to the state before "git rebase", run "git rebase --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Could not apply aba31c552d... [BE]: Add better optional typing

Raised by https://github.com/pytorch/pytorch/actions/runs/11533330159

[Skylion007]

@pytorchbot merge

[pytorchmergebot]

Merge failed

Reason: Approvers from one of the following sets are needed:

• superuser (pytorch/metamates)
• Core Reviewers (mruberry, lezcano, Skylion007, ngimel, peterbell10, ...)
• Core Maintainers (soumith, gchanan, ezyang, dzhulgakov, malfet, ...)

Details for Dev Infra team

Raised by workflow job

Failing merge rule: Core Maintainers

[Skylion007]

@pytorchbot merge

[pytorchmergebot]

Merge started

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