Random Shuffle Transformer for Image Restoration
Jie Xiao, Xueyang Fu, man zhou, Hongjian Liu, Zheng-Jun Zha
Abstract
Non-local interactions play a vital role in boosting performance for image restoration. However, local window Transformer has been preferred due to its efficiency for processing high-resolution images. The superiority in efficiency comes at the cost of sacrificing the ability to model non-local interactions. In this paper, we present that local window Transformer can also function as modeling non-local interactions. The counterintuitive function is based on the permutation-equivariance of self-attention. The basic principle is quite simple: by *randomly shuffling* the input, local self-attention also has the potential to model non-local interactions without introducing extra parameters. Our random shuffle strategy enjoys elegant theoretical guarantees in extending the local scope. The resulting Transformer dubbed *ShuffleFormer* is capable of processing high-resolution images efficiently while modeling non-local interactions. Extensive experiments demonstrate the effectiveness of ShuffleFormer across a variety of image restoration tasks, including image denoising, deraining, and deblurring. Code is available at https://github.com/jiexiaou/ShuffleFormer.
BibTeX
@inproceedings{icml2023_randomshuffletra,
title = {Random Shuffle Transformer for Image Restoration},
author = {Jie Xiao and Xueyang Fu and man zhou and Hongjian Liu and Zheng-Jun Zha},
booktitle = {ICML 2023},
year = {2023}
}