📰 Story

v0.22.1

Highlights This release features 8 commits from 6 contributors (1 new)! v0.22.1 is a patch release on top of v0.22.0 with targeted bug fixes plus a couple of additions: new model support for JetBrains' Mellum v2, zentorch-accelerated quantized linear inference on AMD Zen CPUs, and fixes for multi-node Ray data-parallel serving, DeepSeek-V4 initialization, and a few model-loading regressions. Model Support New model: JetBrains' Mellum v2 , an open-weights Mixture-of-Experts code-generation model ( #43992 ). DeepSeek-V4 : resolve a CUTLASS fmin compatibility issue that broke initialization ( 0decac0 ). Fix OlmoHybridForCausalLM failing to initialise after the checkpoint changed rope_parameters from None to {"rope_type": None} ( #43846 ). Fix HyperCLOVAX loading after the upstream HuggingFace repo removed its remote code (now native in transformers >= 5.9.0 ): register the hyperclovax model_type so vLLM uses its vendored config instead of the stale auto_map ( #43860 ). Hardware & Performance AMD Zen CPUs : route W8A8 (int8 dynamic-symmetric) and W4A16 (GPTQ) linear inference through zentorch kernels, registered ahead of the generic oneDNN CPU kernels, with transparent fallback on non-Zen CPUs, GPUs, and XPU ( #41813 ). Large Scale Serving Fix a deterministic hang in multi-node Ray data-parallel serving with num_api_servers > 1 by excluding the Ray DP backend from the deferred (kernel-assigned) port allocation introduced in #42585 ( #43864 ). Build & CI Docker: stop installing fl