Omnigen V1

🚀 OmniGen: Unified Image Generation

OmniGen is a unified image generation model capable of generating a wide variety of images from multi - modal prompts. It simplifies the image - generation process, eliminating the need for additional plugins and operations, similar to how GPT functions in language generation.

🚀 Quick Start

Using OmniGen

Install via Github:

git clone https://github.com/staoxiao/OmniGen.git
cd OmniGen
pip install -e .

You can also create a new environment to avoid conflicts:

# Create a python 3.10.12 conda env (you could also use virtualenv)
conda create -n omnigen python=3.10.12
conda activate omnigen

# Install pytorch with your CUDA version, e.g.
pip install torch==2.3.1+cu118 torchvision --extra - index - url https://download.pytorch.org/whl/cu118

git clone https://github.com/staoxiao/OmniGen.git
cd OmniGen
pip install -e .

Here are some examples:

from OmniGen import OmniGenPipeline

pipe = OmniGenPipeline.from_pretrained("Shitao/OmniGen-v1")  
# Note: Your local model path is also acceptable, such as 'pipe = OmniGenPipeline.from_pretrained(your_local_model_path)', where all files in your_local_model_path should be organized as https://huggingface.co/Shitao/OmniGen-v1/tree/main


## Text to Image
images = pipe(
    prompt="A curly - haired man in a red shirt is drinking tea.", 
    height=1024, 
    width=1024, 
    guidance_scale=2.5,
    seed=0,
)
images[0].save("example_t2i.png")  # save output PIL Image

## Multi - modal to Image
# In the prompt, we use the placeholder to represent the image. The image placeholder should be in the format of <img><|image_*|></img>
# You can add multiple images in the input_images. Please ensure that each image has its placeholder. For example, for the list input_images [img1_path, img2_path], the prompt needs to have two placeholders: <img><|image_1|></img>, <img><|image_2|></img>.
images = pipe(
    prompt="A man in a black shirt is reading a book. The man is the right man in <img><|image_1|></img>.",
    input_images=["./imgs/test_cases/two_man.jpg"],
    height=1024, 
    width=1024,
    guidance_scale=2.5, 
    img_guidance_scale=1.6,
    seed=0
)
images[0].save("example_ti2i.png")  # save output PIL image

• If out of memory, you can set offload_model = True. If the inference time is too long when inputting multiple images, you can reduce the max_input_image_size. For the required resources and the method to run OmniGen efficiently, please refer to [docs/inference.md#requiremented - resources](docs/inference.md#requiremented - resources).
• For more examples of image generation, you can refer to inference.ipynb and inference_demo.ipynb
• For more details about the argument in inference, please refer to docs/inference.md.

Using Diffusers

Coming soon.

Gradio Demo

We construct an online demo in Huggingface.

For the local gradio demo, you need to install pip install gradio spaces, and then you can run:

pip install gradio spaces
python app.py

Use Google Colab

To use with Google Colab, please use the following command:

!git clone https://github.com/staoxiao/OmniGen.git
%cd OmniGen
!pip install -e .
!pip install gradio spaces
!python app.py --share

✨ Features

OmniGen is a unified image generation model that can be used to perform various tasks, including but not limited to text - to - image generation, subject - driven generation, Identity - Preserving Generation, image editing, and image - conditioned generation. It can automatically identify the features (e.g., required object, human pose, depth mapping) in input images according to the text prompt without the need for additional plugins or operations.

📚 Documentation

1. News

• 2024 - 10 - 28: We release a new version of the inference code, optimizing the memory usage and time cost. You can refer to [docs/inference.md](docs/inference.md#requiremented - resources) for detailed information.
• 2024 - 10 - 22: :fire: We release the code for OmniGen. Inference: docs/inference.md Train: [docs/fine - tuning.md](docs/fine - tuning.md)
• 2024 - 10 - 22: :fire: We release the first version of OmniGen. Model Weight: [Shitao/OmniGen - v1](https://huggingface.co/Shitao/OmniGen - v1) HF Demo: 🤗

2. Overview

Existing image generation models often require loading several additional network modules and performing extra pre - processing steps to generate a satisfactory image. However, OmniGen aims to make the image generation paradigm more simple and flexible, generating various images directly through arbitrarily multi - modal instructions. Due to limited resources, it still has room for improvement. We will continue to optimize it and hope it inspires more universal image - generation models. You can easily fine - tune OmniGen without worrying about designing networks for specific tasks.

3. Methodology

You can see details in our paper.

4. What Can OmniGen do?

OmniGen can be used for various image - generation tasks. We showcase some examples in inference.ipynb. And in inference_demo.ipynb, we show an interesting pipeline to generate and modify an image. You can control the image generation flexibly via OmniGen.

If you are not entirely satisfied with certain functionalities or wish to add new capabilities, you can try [fine - tuning OmniGen](#6 - finetune).

6. Finetune

We provide a training script train.py to fine - tune OmniGen. Here is a toy example about LoRA finetune:

accelerate launch --num_processes = 1 train.py \
    --model_name_or_path Shitao/OmniGen - v1 \
    --batch_size_per_device 2 \
    --condition_dropout_prob 0.01 \
    --lr 1e - 3 \
    --use_lora \
    --lora_rank 8 \
    --json_file ./toy_data/toy_subject_data.jsonl \
    --image_path ./toy_data/images \
    --max_input_length_limit 18000 \
    --keep_raw_resolution \
    --max_image_size 1024 \
    --gradient_accumulation_steps 1 \
    --ckpt_every 10 \
    --epochs 200 \
    --log_every 1 \
    --results_dir ./results/toy_finetune_lora

Please refer to [docs/fine - tuning.md](docs/fine - tuning.md) for more details (e.g., full finetune).

Contributors:

Thank all our contributors for their efforts and warmly welcome new members to join in!

📄 License

This repo is licensed under the MIT License.

📚 Citation

If you find this repository useful, please consider giving a star ⭐ and citation

@article{xiao2024omnigen,
  title={Omnigen: Unified image generation},
  author={Xiao, Shitao and Wang, Yueze and Zhou, Junjie and Yuan, Huaying and Xing, Xingrun and Yan, Ruiran and Wang, Shuting and Huang, Tiejun and Liu, Zheng},
  journal={arXiv preprint arXiv:2409.11340},
  year={2024}
}