# Device resolution


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Centralizes the `"cuda" if torch.cuda.is_available() else "cpu"` idiom
that Whisper, Voxtral-HF, Qwen3-FA, Demucs, and LavaSR each reimplement
in `_apply_config` / `_load_model`.

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### resolve_torch_device

``` python

def resolve_torch_device(
    spec:str='auto', # Requested device: "auto", "cpu", "cuda", or "cuda:N"
)->str: # Concrete device string

```

*Resolve a device spec to a concrete torch device string.*

`"auto"` resolves to `"cuda"` when CUDA is available, else `"cpu"`. Any
explicit spec (`"cpu"`, `"cuda"`, `"cuda:0"`, …) is returned unchanged.

Tests.

``` python
# Explicit specs pass through unchanged.
assert resolve_torch_device("cpu") == "cpu"
assert resolve_torch_device("cuda:1") == "cuda:1"

# "auto" resolves to a concrete device matching CUDA availability.
assert resolve_torch_device("auto") in ("cuda", "cpu")
assert resolve_torch_device("auto") == ("cuda" if torch.cuda.is_available() else "cpu")
```