Table of contents

1. Installation
2. Dataset preparation
3. How to run
4. Results
5. Evaluation
6. Acknowledgments
7. Contacts

Official PyTorch implementation of "Wavelet Diffusion Models are fast and scalable Image Generators" (CVPR'23)

Hao Phung   ·   Quan Dao   ·   Anh Tran

VinAI Research

[Paper]    [Poster]    [Slides]    [Video]

WaveDiff is a novel wavelet-based diffusion scheme that employs low-and-high frequency components of wavelet subbands from both image and feature levels. These are adaptively implemented to accelerate the sampling process while maintaining good generation quality. Experimental results on CelebA-HQ, CIFAR-10, LSUN-Church, and STL-10 datasets show that WaveDiff provides state-of-the-art training and inference speed, which serves as a stepping-stone to offering real-time and high-fidelity diffusion model.

Details of the model architecture and experimental results can be found in our following paper:

@InProceedings{phung2023wavediff,
    author    = {Phung, Hao and Dao, Quan and Tran, Anh},
    title     = {Wavelet Diffusion Models Are Fast and Scalable Image Generators},
    booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
    month     = {June},
    year      = {2023},
    pages     = {10199-10208}
}

Please CITE our paper whenever this repository is used to help produce published results or incorporated into other software.

Installation

Python 3.7.13 and Pytorch 1.10.0 are used in this implementation.

It is recommended to create conda env from our provided environment.yml:

conda env create -f environment.yml
conda activate wavediff

Or you can install neccessary libraries as follows:

pip install -r requirements.txt

For pytorch_wavelets, please follow here.

Dataset preparation

We trained on four datasets, including CIFAR10, STL10, LSUN Church Outdoor 256 and CelebA HQ (256 & 512).

For CIFAR10 and STL10, they will be automatically downloaded in the first time execution.

For CelebA HQ (256) and LSUN, please check out here for dataset preparation.

For CelebA HQ (512 & 1024), please download two zip files: data512x512.zip and data1024x1024.zip and then generate LMDB format dataset by Torch Toolbox.

Those two links of high-res data seem to be broken so we provide our processed lmdb files at here.

Once a dataset is downloaded, please put it in data/ directory as follows:

data/
├── STL-10
├── celeba
├── celeba_512
├── celeba_1024
├── cifar-10
└── lsun

How to run

We provide a bash script for our experiments on different datasets. The syntax is following:

bash run.sh <DATASET> <MODE> <#GPUS>

where:

• <DATASET>: cifar10, stl10, celeba_256, celeba_512, celeba_1024, and lsun.
• <MODE>: train and test.
• <#GPUS>: the number of gpus (e.g. 1, 2, 4, 8).

Note, please set argument --exp correspondingly for both train and test mode. All of detailed configurations are well set in run.sh.

GPU allocation: Our work is experimented on NVIDIA 40GB A100 GPUs. For train mode, we use a single GPU for CIFAR10 and STL10, 2 GPUs for CelebA-HQ 256, 4 GPUs for LSUN, and 8 GPUs for CelebA-HQ 512 & 1024. For test mode, only a single GPU is required for all experiments.

Results

Model performance and pretrained checkpoints are provided as below:

Model	FID	Recall	Time (s)	Checkpoints
CIFAR-10	4.01	0.55	0.08	netG_1300.pth
STL-10	12.93	0.41	0.38	netG_600.pth
CelebA-HQ (256 x 256)	5.94	0.37	0.79	netG_475.pth
CelebA-HQ (512 x 512)	6.40	0.35	0.59	netG_350.pth
LSUN Church	5.06	0.40	1.54	netG_400.pth
CelebA-HQ (1024 x 1024)	5.98	0.39	0.59	netG_350.pth

Inference time is computed over 300 trials on a single NVIDIA A100 GPU for a batch size of 100, except for the one of high-resolution CelebA-HQ (512 & 1024) is computed for a batch of 25 samples.

Downloaded pre-trained models should be put in saved_info/wdd_gan/<DATASET>/<EXP> directory where <DATASET> is defined in How to run section and <EXP> corresponds to the folder name of pre-trained checkpoints.

Evaluation

Inference

Samples can be generated by calling run.sh with test mode.

FID

To compute fid of pretrained models at a specific epoch, we can add additional arguments including --compute_fid and --real_img_dir /path/to/real/images of the corresponding experiments in run.sh.

Recall

We adopt the official Pytorch implementation of StyleGAN2-ADA to compute Recall of generated samples.

Acknowledgments

Thanks to Xiao et al for releasing their official implementation of the DDGAN paper. For wavelet transformations, we utilize implementations from WaveCNet and pytorch_wavelets.

Contacts

If you have any problems, please open an issue in this repository or ping an email to tienhaophung@gmail.com.