FLUX.1-schnell-DF11

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

This is a losslessly compressed version of black-forest-labs/FLUX.1-schnell 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 the DFloat11 pip 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. To use the DFloat11 model, run the following example code in Python:

   import torch
   from diffusers import FluxPipeline
   from dfloat11 import DFloat11Model
   
   pipe = FluxPipeline.from_pretrained("black-forest-labs/FLUX.1-schnell", torch_dtype=torch.bfloat16)
   pipe.enable_model_cpu_offload()
   
   DFloat11Model.from_pretrained('DFloat11/FLUX.1-schnell-DF11', device='cpu', bfloat16_model=pipe.transformer)
   
   prompt = "A futuristic cityscape at sunset, with flying cars, neon lights, and reflective water canals"
   image = pipe(
       prompt,
       guidance_scale=0.0,
       num_inference_steps=4,
       max_sequence_length=256,
       generator=torch.Generator("cpu").manual_seed(0)
   ).images[0]
   image.save("flux-schnell.png")
   

📄 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