loom-py-rt-vulkan

The Vulkan backend for loom-py-rt. One shared library in one small wheel; there is nothing here to import.

pip install "loom-py-rt[vulkan]"

import loom

loom.devices()                                   # a Vulkan device now appears
model = loom.Model.from_file(path, device="gpu")

The base package is unchanged by installing this — it discovers the library on sys.path at import and device="auto" starts using it. That is what GGML_BACKEND_DL buys: no second copy of the runtime per accelerator.

If it appears not to have worked

Check loom.devices(). A backend whose driver is too old, or which finds no supported device, loads without error and registers nothing — the only other symptom is a model running at CPU speed.

device="gpu" asks for an offload device with its own memory, preferring one the kernel confirms is a GPU. It is not a promise that Vulkan specifically was chosen. Pass device="Vulkan0" to require this backend.

Versioning

This package pins the base with ==, not ~=. It carries a libggml-vulkan.so that is dlopened beside the base wheel's libggml-base.so, and ggml makes no ABI promise across revisions — so a base release that moves its ggml pin invalidates every backend wheel published before it. The exact pin is what stops pip from pairing two libraries that do not agree.

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