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* feat(vllm): macOS/Metal support via vllm-metal (MLX) Add an additive Apple-Silicon path to the existing vllm Python backend so vLLM runs on macOS via vllm-metal (github.com/vllm-project/vllm-metal). Spike outcome (proven on a real M4 / macOS 26.5, Qwen3-0.6B): - vllm-metal registers through vLLM's platform-plugin entry point (metal -> vllm_metal:register); MetalPlatform activates and runs on the GPU through MLX. - LocalAI's backend.py is UNCHANGED: AsyncEngineArgs(...) -> AsyncLLMEngine.from_engine_args transparently resolves to vLLM 0.23's v1 AsyncLLM MLX engine, and async generate produced correct output. - backend.py is NOT touched: its only empty_cache() call is CUDA-only (guarded by torch.cuda.is_available()), so the benign shutdown-only "Allocator for mps is not a DeviceAllocator" noise comes from vLLM's internal EngineCore teardown, not from our code. Changes (all gated behind a darwin condition; Linux/CUDA/ROCm/Intel paths are byte-for-byte unchanged): - install.sh: darwin branch forces PYTHON_VERSION=3.12 (vllm-metal requirement), creates/activates LocalAI's managed venv via ensureVenv, then reproduces vllm-metal's installer INTO that venv (build vLLM 0.23.0 from the release source tarball against requirements/cpu.txt, then install the prebuilt vllm-metal wheel from its latest GitHub release), and runs runProtogen. installRequirements is skipped on darwin. - backend-matrix.yml: add a vllm includeDarwin entry (mps, python). - index.yaml: add metal capability + concrete metal-vllm / metal-vllm-development child entries mirroring the metal-kitten-tts template. Version coupling: vllm-metal pins vLLM 0.23.0, equal to LocalAI's current vllm pin. Bumping vllm must be coordinated with a supporting vllm-metal release; documented in install.sh and requirements-cublas13-after.txt. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude:opus-4.8 [Claude Code] * chore(vllm): track the darwin vllm-metal pin via the autobumper The Apple Silicon build pinned vLLM 0.23.0 as a hidden string in install.sh while floating the vllm-metal wheel on releases/latest - the two could drift apart silently. Make both a tracked, reproducible pair (VLLM_METAL_VERSION + VLLM_VERSION), fetch the wheel by tag, and add .github/bump_vllm_metal.sh wired into bump_deps.yaml. It tracks vllm-project/vllm-metal (not vllm/vllm latest), reading the coupled vLLM source version from vllm-metal's own installer, and opens a bump PR - mirroring the existing bump_vllm_wheel.sh for the cu130 wheel. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude:opus-4.8 [Claude Code] * chore(vllm): derive the darwin vLLM version, drop the second pin Follow-up: VLLM_VERSION was still a hardcoded string duplicating what VLLM_METAL_VERSION already determines. Derive it at install time from vllm-metal's own installer (vllm_v=) at the pinned tag - one source of truth, no second value to drift. The bumper now touches only VLLM_METAL_VERSION; the derivation is immutable per tag, so builds stay reproducible. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude:opus-4.8 [Claude Code] * fix(vllm): fetch the vllm-metal wheel without the GitHub API The darwin build resolved the wheel URL via api.github.com, whose unauthenticated rate limit (60/hr per IP) 403s on shared macOS runners (observed after the 9-min vLLM source build). Construct the release-asset download URL deterministically from the pinned tag and the cp312/arm64 wheel name instead - no API call, no rate limit. Verified the URL resolves (200). Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude:opus-4.8 [Claude Code] * fix(vllm): fail Score cleanly when the engine returns no prompt_logprobs Audit of the Score path against vllm-metal (MLX on macOS): the engine accepts SamplingParams(prompt_logprobs=1) but returns an all-None prompt_logprobs list rather than computing it, so scoring is not supported there. The old guard treated the truthy [None] list as valid and silently scored every candidate as 0. Detect the all-None case and return UNIMPLEMENTED instead. No-op on Linux/CUDA, which populate real entries. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude:opus-4.8 [Claude Code] --------- Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>
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