FLUX.2-dev-MXFP4-RTN-AutoRound
Model Details
This is a MXFP4 (4-bit micro-scaling) quantization of black-forest-labs/FLUX.2-dev, a flagship text-to-image diffusion model. Generated by AutoRound with RTN (round-to-nearest, iters=0).
- Base model: black-forest-labs/FLUX.2-dev
- Quantization: MXFP4 (W4A4), group_size=32
- Method: AutoRound RTN
- Model size: ~62 GB (vs ~110 GB bf16)
Quantization Details
- Scheme: MXFP4 (data_type=mx_fp, bits=4, act_bits=4)
- Group size: 32
- Export format: auto_round (vllm-omni compatible)
- Calibration: coco2014, 28 steps, guidance 3.5
Evaluation
Evaluated with vllm-omni diffusion harness (28 steps, guidance 3.5, 1024×1024, seed 42).
| Benchmark | BF16 Baseline | MXFP4 Quantized |
|---|---|---|
| DrawBench CLIP | 32.48 | 32.44 |
| DrawBench CLIP-IQA | 71.35 | 71.01 |
| DrawBench ImageReward | 1.15 | 1.11 |
| GenEval | 0.844 | 0.835 |
MXFP4 quantization is nearly lossless vs the BF16 baseline (GenEval 0.835 vs 0.844, CLIP 32.44 vs 32.48).
Usage
from vllm_omni.entrypoints.omni import Omni
from vllm_omni.inputs.data import OmniDiffusionSamplingParams
omni = Omni(model="INCModel3/FLUX.2-dev-MXFP4-RTN-AutoRound", mode="text-to-image")
params = OmniDiffusionSamplingParams(
height=1024, width=1024, seed=42,
guidance_scale=3.5, num_inference_steps=28, num_outputs_per_prompt=1,
)
out = omni.generate("a red bench in a park", sampling_params_list=[params])
License
Please follow the license of the original model black-forest-labs/FLUX.2-dev.
Produced with autoquant-agent — agent-driven quantize + evaluate + self-heal.