Arm backend: Add docstrings to vgf/backend.py and ethosu/backend.py

[Sebastian-Larsson]

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15887

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❌ 13 New Failures, 4 Unrelated Failures

As of commit 9700cf0 with merge base 6e9fb80 ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 004a4b2cc00fbee6f6563dfc281ae9dafebc4d1a93d87fd0d08c186615f2ce17 /exec failed with exit code 1
• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 1efe3ab9666f62e5f5c2e7c5e6b1e4c9c4f84bb11f5556ec5ec786cc2b656f77 /exec failed with exit code 92
• pull / test-models-linux (add, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 0012044bbb87fbd984f8dafe04262006434054ba4882e82f8e7ae378e736726c /exec failed with exit code 1
• pull / test-models-linux (emformer_transcribe, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 7f7af8e53bcb227a42435e0fcc11f573b9a1b5f79c00f943bd7849a64b6e0c2a /exec failed with exit code 1
• pull / test-models-linux (ic3, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 652cb6893be888892d373e89804e057b60ea81e3708daa7fc1271e2ed10b6995 /exec failed with exit code 1
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t 48d037afde1c79969d123f9363a208e8fa4111c116129d440a18dd998e9078bf /exec failed with exit code 1
• pull / test-models-linux (resnet18, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t d48d1918186b4d6d4d8b1d0a887deff0a866795da33005013bc94a9602e5b078 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t e6c3c2cfa7d30ca5a9926304f213cce6fce32aa4c7a1ff7c787b2cb580c9e2f8 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t b1769b44d3c7c157aa1d743db22f6bcd69a67ebfd121c9f4ea40fb60c651800c /exec failed with exit code 1
• pull / test-selective-build-linux / linux-job (gh)
  RuntimeError: Command docker exec -t b7dec68e70db94cb27267d5471d43ce9ff38ed1ce53e92fcdf16361795e3cd5f /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t c822ead8bd92f2d1cd5511aa33670eb0cbccb188c4d541c653479eafa7e61d43 /exec failed with exit code 1
• Test CUDA Builds / check-all-cuda-builds (gh)
  Process completed with exit code 1.
• Test CUDA Builds / test-executorch-cuda-build-13.0 / linux-job (gh)
  RuntimeError: Command docker exec -t 0fa09009d7934c6167ba433ba35dca13f9c8790c11eeb02cd3fb52edda6384c5 /exec failed with exit code 1

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

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

• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74
• pull / unittest / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module

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[zingo]

To many fails even if most/all probably are unrelated, Rebased to see if we can get a "OK" amount :)