Alpha-VLLM/Lumina-Image-2.0 is a 2.6B single-stream DiT with a Gemma2-2B
encoder and a standard 16-channel VAE, all transformers-4.x-compatible, so the
generic from_pretrained pipeline path loads it as a new lumina-2 family:
- Family entry (Lumina2Pipeline / Lumina2Transformer2DModel), aliased to
lumina-image-2.0 / lumina-image-2 / lumina2. No bare lumina alias: Lumina-Next
checkpoints are a different arch and must stay unknown rather than crash
mid-load. bf16-only upstream, so the fp16 fallback stays off like z-image.
- Trust the official repo for non-GGUF loads; bf16 component table entry
(ships fp32, ~5.2 GB transformer + 5.2 GB encoder bf16-resident).
- Generation defaults 50 steps / guidance 4.0 per the model card, and the
generate call passes the card's cfg_trunc_ratio=0.25 itself (family-gated,
signature-gated): the pipeline default (1.0) runs the CFG double-forward on
every step and oversaturates output.
- Catalog group with the single ungated bf16 pipeline artifact (11 GB resident)
plus routing assertions; images page defaults row.
- No GGUF artifact: none exists upstream (only finetune/LLM quants), so the
dense transformer_quant fast path (GGUF-kind-only) stays unreachable for now.
Offline probes of the future prequant campaign: int8 and fp8 both engage and
render cleanly (fp8 LPIPS 0.11 vs bf16, int8 0.33 from 50-step trajectory
drift with intact quality), so neither scheme is family-denied.
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