https://github.com/GaParmar/img2img-turbo

One-step image-to-image with SD-turbo: sketch2image, day2night, and more

Paper | Sketch2Image Demo

We propose a general method for adapting a single-step diffusion model, such as SD-Turbo, to new tasks and domains through adversarial learning. This enables us to leverage the internal knowledge of pre-trained diffusion models while achieving efficient inference (e.g., for 512x512 images, 0.29 seconds on A6000 and 0.11 seconds on A100).

Our one-step conditional models CycleGAN-Turbo and pix2pix-turbo can perform various image-to-image translation tasks for both unpaired and paired settings. CycleGAN-Turbo outperforms existing GAN-based and diffusion-based methods, while pix2pix-turbo is on par with recent works such as ControlNet for Sketch2Photo and Edge2Image, but with one-step inference.

One-Step Image Translation with Text-to-Image Models
Gaurav Parmar, Taesung Park, Srinivasa Narasimhan, Jun-Yan Zhu
CMU and Adobe, arXiv 2403.12036

Edge to Image

By varying the input noise map, our method can generate diverse outputs from the same input conditioning. The output style can be controlled by changing the text prompt.

Day to Night

Night to Day

Clear to Rainy

Rainy to Clear

---

Our Generator Architecture: We tightly integrate three separate modules in the original latent diffusion models into a single end-to-end network with small trainable weights. This architecture allows us to translate the input image x to the output y, while retaining the input scene structure. We use LoRA adapters in each module, introduce skip connections and Zero-Convs between input and output, and retrain the first layer of the U-Net. Blue boxes indicate trainable layers. Semi-transparent layers are frozen. The same generator can be used for various GAN objectives.

Environment Setup

• We provide a conda env file that contains all the required dependencies.

  conda env create -f environment.yaml
  

• Following this, you can activate the conda environment with the command below.

  conda activate img2img-turbo
  

Paired Image Translation (pix2pix-turbo)

• The following command takes an image file and a prompt as inputs, extracts the canny edges, and saves the results in the directory specified.

  python src/inference_paired.py --model "edge_to_image" \
      --input_image "assets/bird.png" \
      --prompt "a blue bird" \
      --output_dir "outputs"

• The following command takes a sketch and a prompt as inputs, and saves the results in the directory specified.

  python src/inference_paired.py --model "sketch_to_image_stochastic" \
  --input_image "assets/sketch.png" --gamma 0.4 \
  --prompt "ethereal fantasy concept art of an asteroid. magnificent, celestial, ethereal, painterly, epic, majestic, magical, fantasy art, cover art, dreamy" \
  --output_dir "outputs"

Unpaired Image Translation (CycleGAN-Turbo)

• The following command takes an image file as input, and saves the results in the directory specified.

  python src/inference_unpaired.py --model "day_to_night" \
      --input_image "assets/day.png" --output_dir "outputs"

• We provide a Gradio demo for the paired image translation tasks.
• The following command will launch the sketch to image locally using gradio.

  gradio gradio_sketch2image.py
  

Our work uses the Stable Diffusion-Turbo as the base model with the following LICENSE.