Voxtral Realtime: (1) convert use_standard_sdpa to backend flag (2) consistent md files

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❌ 18 New Failures, 1 Unrelated Failure

As of commit 4f141f1 with merge base 570d2e9 ():

NEW FAILURES - The following jobs have failed:

• periodic / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
  RuntimeError: Command docker exec -t 1ccabc3c8ee57633c235c2a19f622015a8ef33a222fbf067fa733fe7b2cafc9d /exec failed with exit code 1
• periodic / test-models-linux (cmake, vit, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
  RuntimeError: Command docker exec -t deecbc0ff0f3d90d08377c110795fec725434639736bba5155addfb271bea69f /exec failed with exit code 1
• pull / test-models-linux (add_mul, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t b71d27bf615adcabdc9eef3a55d0e91eb521970bb5dec43543ac0f8a249c936c /exec failed with exit code 1
• pull / test-models-linux (add, portable, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 94fe27651b25a791d8cdba18013e12af45f0c404c93f65bfa69b55f79cfb8796 /exec failed with exit code 1
• pull / test-models-linux (emformer_join, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t d6cdd3e3918b0d8f32eeb9f13f908c5aaebc3466574346f562299f9b7f70b250 /exec failed with exit code 1
• pull / test-models-linux (emformer_join, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t a8893600d0fc19ea4d34f267bcc6a9ad8c08f93843cd64cc5e6b1cdd26cd7693 /exec failed with exit code 1
• pull / test-models-linux (ic3, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 60da2bfe654ee927da2944ad886edf52a630fd7e5a764e0215be3e3ae0eb3680 /exec failed with exit code 1
• pull / test-models-linux (linear, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t aa59f9daea059195b9bd57b4ca216e7d8980de112d0eb944cd842e8bada9d170 /exec failed with exit code 1
• pull / test-models-linux (mv2, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 6337987e9df22eb5d64ffefedd30ca5433fdb3da937646f8c6f42c80826ab218 /exec failed with exit code 1
• pull / test-models-linux (resnet18, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 188ddb799dbd40807af4e72142f9ce1451cfd3c96ff6ec53781ed5a188e9fffd /exec failed with exit code 1
• pull / test-models-linux (w2l, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t 16bb79b674b8325d1fcf7edf8c0aa018b71d689e0ae3a1f987d58a413b2d97db /exec failed with exit code 1
• pull / test-models-linux-basic (mv3, xnnpack-quantization-delegation, buck2, linux.2xlarge, executorch-u... / linux-job (gh)
  RuntimeError: Command docker exec -t 235d0813aa7272bccc0e9b504e4160cdff8cda0bb4752a19ac68d29540fc57d5 /exec failed with exit code 1
• pull / test-selective-build-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 36f7dc5719caaf851562726f3b0a6b24252abdd9414feec255d4dffc6b8bfc1b /exec failed with exit code 1
• pull / test-static-llama-qnn-linux (stories_260k_bc) / linux-job (gh)
  RuntimeError: Command docker exec -t 07b9f7c20d9460bc5f2cc1fe945935c5b999e6bd0fb5914bf56e298659bd9438 /exec failed with exit code 92
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6efff66fe6c64683ae0d146a1826f30502c5c5066d8293039b30ef83153bfc72 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-deps (test_pytest_models_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 7afa67903a5152c66f1921cfa96c8c99c7e8d26ae579e3b0f817f6735ee024f0 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-deps (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 5d1a9fc0e985032c87089a82c594e2ed07751894bac60396e4f844ed3d77e41d /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 78ba32cac215932a1c0d319bbbc90b086acdf7fae78b8701d6db9db8ca27c9fc /exec failed with exit code 1

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

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

• pull / test-models-linux (mv2, portable, linux.2xlarge) / linux-job (gh) (trunk failure)

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[Copilot]

Pull request overview

This PR refactors the Voxtral Realtime model to replace a boolean configuration flag (use_standard_attention) with a more explicit string-based backend field that can specify one of three backends: "xnnpack", "metal", or "portable". This change makes the backend selection more explicit and extensible.

Changes:

• Replaced use_standard_attention: bool config field with backend: str to explicitly specify the backend ("xnnpack", "metal", or "portable")
• Updated all conditional checks from boolean to string comparisons (backend == "metal")
• Updated function signatures, documentation strings, and markdown documentation to reflect the new backend parameter

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
examples/models/voxtral_realtime/model.py	Replaced use_standard_attention boolean with backend string field in config, updated all conditional logic and function signatures
examples/models/voxtral_realtime/model.md	Updated documentation to reflect backend field usage, corrected class names (StandardSDPA -> MetalSDPA), clarified streaming encoder backend support
examples/models/voxtral_realtime/export_voxtral_rt.py	Updated to pass backend parameter directly instead of computing use_standard_attention boolean

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