build_nunchaku/src/examples/v1/flux.1-dev.py

import torch
from diffusers import FluxPipeline

from nunchaku import NunchakuFluxTransformer2DModelV2
from nunchaku.utils import get_precision

precision = get_precision()  # auto-detect your precision is 'int4' or 'fp4' based on your GPU
transformer = NunchakuFluxTransformer2DModelV2.from_pretrained(
    f"nunchaku-tech/nunchaku-flux.1-dev/svdq-{precision}_r32-flux.1-dev.safetensors"
)
pipeline = FluxPipeline.from_pretrained(
    "black-forest-labs/FLUX.1-dev", transformer=transformer, torch_dtype=torch.bfloat16
).to("cuda")
image = pipeline("A cat holding a sign that says hello world", num_inference_steps=20, guidance_scale=3.5).images[0]
image.save(f"flux.1-dev-{precision}.png")