fix(qwen-asr): select Intel XPU devices - #11539
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The Intel backend installs PyTorch XPU wheels, but Qwen ASR only checked CUDA and MPS. Every Intel model therefore loaded on the CPU. Select XPU when available and place the model on xpu:0. Keep the existing CUDA, MPS, and CPU placement behavior. Assisted-by: Codex:GPT-5 [apply_patch] [gh]
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Description
This PR fixes #8934.
The Intel qwen-asr image already installs PyTorch XPU wheels, but the backend only selected CUDA, MPS, or CPU. It now detects an available XPU, uses BF16, and places the model on
xpu:0. CUDA, MPS, and CPU selection remain unchanged.Notes for Reviewers
The regression suite uses a small torch availability stub, so it verifies device selection and placement without a model download or GPU runner.
Verification:
python3 -m unittest discover -s backend/python/qwen-asr -p "*_test.py"python3 -m py_compile backend/python/qwen-asr/backend.py backend/python/qwen-asr/device_utils.py backend/python/qwen-asr/device_utils_test.pygit diff --checkSigned commits
Documentation is not applicable because this restores the existing Intel backend behavior and adds no API, CLI, or configuration surface.