[not for land] towards QAT with exact forward pass

[vkuzo]

Summary:

Exploration for QAT with exact (not emulated) forward pass, WIP and not ready for review.

Test Plan:

Reviewers:

Subscribers:

Tasks:

Tags:

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2529

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 1 Unrelated Failure

As of commit ff2153c with merge base c1e84cc ():

NEW FAILURE - The following job has failed:

• Code Analysis with Ruff / build (3.9) (gh)
  torchao/prototype/qat_exact/triton_gemm.py:42:5: F841 Local variable num_pid_m is assigned to but never used

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

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

• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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