Request: NVFP4 Version

#60
by Zesales - opened

This Model in VLLM with NVFP4 - Weights Only without KV Quantization (Consumer GPU Support)

@Zesales Good request β€” and the timing's right, because NVFP4 weight-only (W4A16) is exactly the path vLLM now supports on Blackwell (RTX 50-series), with FP16 KV left untouched. So the format you're asking for is feasible on consumer Blackwell today.

Two honest caveats before I commit to anything:

  1. vLLM compatibility for this checkpoint. vLLM added native Gemma 4 support in 0.19, but this is a fine-tune with a custom chat template and a few non-standard config bits, so I need to validate vLLM compatibility for this checkpoint first β€” confirm it loads and generates correctly at FP16 before quantizing. I don't want to ship an NVFP4 build that silently misbehaves.
  2. It's a from-master job. NVFP4 has to be calibrated from the fp16 safetensors master with nvidia-modelopt, not reconverted from a GGUF β€” so it's a separate artifact to build and upload, not a quick repack.

Net: I'm genuinely interested and it's on th (dropping in the next day or two) and the27B first, then do the vLLM/NVFP4 path properly with a real end-to-end check on a 50-series card. I'll post here once I've verified it loads + runs clean. And if you're on a 5090/5080 and want to try quantizing from the master weights yourself in the meantime, happy to point you.

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