FLUX.1-dev-DF11

DFloat11 Compressed Model: black-forest-labs/FLUX.1-dev

This is a losslessly compressed version of black-forest-labs/FLUX.1-dev using our custom DFloat11 format. The outputs of this compressed model are bit-for-bit identical to the original BFloat16 model, while reducing GPU memory consumption by approximately 30%.

🔍 How It Works

DFloat11 compresses model weights using Huffman coding of BFloat16 exponent bits, combined with hardware-aware algorithmic designs that enable efficient on-the-fly decompression directly on the GPU. During inference, the weights remain compressed in GPU memory and are decompressed just before matrix multiplications, then immediately discarded after use to minimize memory footprint.

Key benefits:

• No CPU decompression or host-device data transfer --- all operations are handled entirely on the GPU.
• DFloat11 is much faster than CPU-offloading approaches, enabling practical deployment in memory-constrained environments.
• The compression is fully lossless, guaranteeing that the model’s outputs are bit-for-bit identical to those of the original model.

🔧 How to Use

1. Install or upgrade the DFloat11 package (installs the CUDA kernel automatically; requires a CUDA-compatible GPU and PyTorch installed):

   pip install dfloat11[cuda12]
   # or if you have CUDA version 11:
   # pip install dfloat11[cuda11]
   

2. Install or upgrade the diffusers package:

   pip install -U diffusers
   

3. Save the following code as a Python file flux1.py:

   import torch
   from diffusers import FluxPipeline, FluxTransformer2DModel
   from dfloat11 import DFloat11Model
   from transformers.modeling_utils import no_init_weights
   
   with no_init_weights():
       transformer = FluxTransformer2DModel.from_config(
           FluxTransformer2DModel.load_config(
               "black-forest-labs/FLUX.1-dev", subfolder="transformer"
           )
       ).to(torch.bfloat16)
   
   pipe = FluxPipeline.from_pretrained(
       "black-forest-labs/FLUX.1-dev",
       transformer=transformer,
       torch_dtype=torch.bfloat16
   )
   
   DFloat11Model.from_pretrained(
       'DFloat11/FLUX.1-dev-DF11',
       device='cpu',
       bfloat16_model=pipe.transformer,
   )
   
   pipe.enable_model_cpu_offload()
   
   prompt = "A scenic landscape with mountains, a river, and a clear sky."
   image = pipe(
       prompt,
       width=1024,
       height=1024,
       guidance_scale=3.5,
       num_inference_steps=50,
       max_sequence_length=512,
       generator=torch.Generator(device="cuda").manual_seed(0)
   ).images[0]
   
   image.save("image.png")
   

4. Run python flux1.py in your terminal.

📄 Learn More

• Paper: 70% Size, 100% Accuracy: Lossless LLM Compression for Efficient GPU Inference via Dynamic-Length Float
• GitHub: https://github.com/LeanModels/DFloat11
• HuggingFace: https://huggingface.co/DFloat11