HAT

Activating More Pixels in Image Super-Resolution Transformer [Paper Link]

Xiangyu Chen, Xintao Wang, Jiantao Zhou, Yu Qiao and Chao Dong

HAT: Hybrid Attention Transformer for Image Restoration [Paper Link]

Xiangyu Chen, Xintao Wang, Wenlong Zhang, Xiangtao Kong, Jiantao Zhou, Yu Qiao and Chao Dong

Updates

• ✅ 2022-05-09: Release the first version of the paper at Arxiv.
• ✅ 2022-05-20: Release the codes, models and results of HAT.
• ✅ 2022-08-29: Add a Replicate demo for SRx4.
• ✅ 2022-09-25: Add the tile mode for inference with limited GPU memory.
• ✅ 2022-11-24: Upload a GAN-based HAT model for Real-World SR (Real_HAT_GAN_SRx4.pth).
• ✅ 2023-03-19: Update paper to CVPR version. Small HAT models are added.
• ✅ 2023-04-05: Upload the HAT-S codes, models and results.
• ✅ 2023-08-01: Upload another GAN model for sharper results (Real_HAT_GAN_SRx4_sharper.pth).
• ✅ 2023-08-01: Upload the training configs for the Real-World GAN-based model.
• ✅ 2023-09-11: Release the extended version of the paper at Arxiv.
• (To do) Add the tile mode for Replicate demo.
• (To do) Update the Replicate demo for Real-World SR.
• (To do) Add HAT models for Multiple Image Restoration tasks.

Overview

Benchmark results on SRx4 without ImageNet pretraining. Mulit-Adds are calculated for a 64x64 input.

Model	Params(M)	Multi-Adds(G)	Set5	Set14	BSD100	Urban100	Manga109
SwinIR	11.9	53.6	32.92	29.09	27.92	27.45	32.03
HAT-S	9.6	54.9	32.92	29.15	27.97	27.87	32.35
HAT	20.8	102.4	33.04	29.23	28.00	27.97	32.48

Real-World SR Results

Note that:

• The default settings in the training configs (almost the same as Real-ESRGAN) are for training Real_HAT_GAN_SRx4_sharper.
• Real_HAT_GAN_SRx4 is trained using similar settings without USM the ground truth.
• Real_HAT_GAN_SRx4 would have better fidelity.
• Real_HAT_GAN_SRx4_sharper would have better perceptual quality.

Results produced by Real_HAT_GAN_SRx4_sharper.pth.

Comparison with the state-of-the-art Real-SR methods.

Citations

BibTeX

@InProceedings{chen2023activating,
    author    = {Chen, Xiangyu and Wang, Xintao and Zhou, Jiantao and Qiao, Yu and Dong, Chao},
    title     = {Activating More Pixels in Image Super-Resolution Transformer},
    booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
    month     = {June},
    year      = {2023},
    pages     = {22367-22377}
}

@article{chen2023hat,
  title={HAT: Hybrid Attention Transformer for Image Restoration},
  author={Chen, Xiangyu and Wang, Xintao and Zhang, Wenlong and Kong, Xiangtao and Qiao, Yu and Zhou, Jiantao and Dong, Chao},
  journal={arXiv preprint arXiv:2309.05239},
  year={2023}
}

Environment

• PyTorch >= 1.7 (Recommend NOT using torch 1.8!!! It would cause abnormal performance.)
• BasicSR == 1.3.4.9

Installation

Install Pytorch first. Then,

pip install -r requirements.txt
python setup.py develop

How To Test

Without implementing the codes, chaiNNer is a nice tool to run our models.

Otherwise,

• Refer to ./options/test for the configuration file of the model to be tested, and prepare the testing data and pretrained model.
• The pretrained models are available at Google Drive or Baidu Netdisk (access code: qyrl).
• Then run the following codes (taking HAT_SRx4_ImageNet-pretrain.pth as an example):

python hat/test.py -opt options/test/HAT_SRx4_ImageNet-pretrain.yml

The testing results will be saved in the ./results folder.

• Refer to ./options/test/HAT_SRx4_ImageNet-LR.yml for inference without the ground truth image.

Note that the tile mode is also provided for limited GPU memory when testing. You can modify the specific settings of the tile mode in your custom testing option by referring to ./options/test/HAT_tile_example.yml.

How To Train

• Refer to ./options/train for the configuration file of the model to train.
• Preparation of training data can refer to this page. ImageNet dataset can be downloaded at the official website.
• The training command is like

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 python -m torch.distributed.launch --nproc_per_node=8 --master_port=4321 hat/train.py -opt options/train/train_HAT_SRx2_from_scratch.yml --launcher pytorch

• Note that the default batch size per gpu is 4, which will cost about 20G memory for each GPU.

The training logs and weights will be saved in the ./experiments folder.

Results

The inference results on benchmark datasets are available at Google Drive or Baidu Netdisk (access code: 63p5).

Contact

If you have any question, please email chxy95@gmail.com or join in the Wechat group of BasicSR to discuss with the authors.