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Twins

Twins: Revisiting the Design of Spatial Attention in Vision Transformers

Introduction

Official Repo

Code Snippet

Abstract

Very recently, a variety of vision transformer architectures for dense prediction tasks have been proposed and they show that the design of spatial attention is critical to their success in these tasks. In this work, we revisit the design of the spatial attention and demonstrate that a carefully-devised yet simple spatial attention mechanism performs favourably against the state-of-the-art schemes. As a result, we propose two vision transformer architectures, namely, Twins-PCPVT and Twins-SVT. Our proposed architectures are highly-efficient and easy to implement, only involving matrix multiplications that are highly optimized in modern deep learning frameworks. More importantly, the proposed architectures achieve excellent performance on a wide range of visual tasks, including image level classification as well as dense detection and segmentation. The simplicity and strong performance suggest that our proposed architectures may serve as stronger backbones for many vision tasks. Our code is released at this https URL.

Citation

@article{chu2021twins,
  title={Twins: Revisiting spatial attention design in vision transformers},
  author={Chu, Xiangxiang and Tian, Zhi and Wang, Yuqing and Zhang, Bo and Ren, Haibing and Wei, Xiaolin and Xia, Huaxia and Shen, Chunhua},
  journal={arXiv preprint arXiv:2104.13840},
  year={2021}altgvt
}

Usage

We have provided pretrained models converted from official repo.

If you want to convert keys on your own to use official repositories' pre-trained models, we also provide a script twins2mmseg.py in the tools directory to convert the key of models from the official repo to MMSegmentation style.

python tools/model_converters/twins2mmseg.py ${PRETRAIN_PATH} ${STORE_PATH} ${MODEL_TYPE}

This script convert pcpvt or svt pretrained model from PRETRAIN_PATH and store the converted model in STORE_PATH.

For example,

python tools/model_converters/twins2mmseg.py ./alt_gvt_base.pth ./pretrained/alt_gvt_base.pth svt

Results and models

ADE20K

Method Backbone Crop Size Lr schd Mem (GB) Inf time (fps) mIoU mIoU(ms+flip) config download
Twins-FPN PCPVT-S 512x512 80000 6.60 27.15 43.26 44.11 config model | log
Twins-UPerNet PCPVT-S 512x512 160000 9.67 14.24 46.04 46.92 config model | log
Twins-FPN PCPVT-B 512x512 80000 8.41 19.67 45.66 46.48 config model | log
Twins-UPerNet (8x2) PCPVT-B 512x512 160000 6.46 12.04 47.91 48.64 config model | log
Twins-FPN PCPVT-L 512x512 80000 10.78 14.32 45.94 46.70 config model | log
Twins-UPerNet (8x2) PCPVT-L 512x512 160000 7.82 10.70 49.35 50.08 config model | log
Twins-FPN SVT-S 512x512 80000 5.80 29.79 44.47 45.42 config model | log
Twins-UPerNet (8x2) SVT-S 512x512 160000 4.93 15.09 46.08 46.96 config model | log
Twins-FPN SVT-B 512x512 80000 8.75 21.10 46.77 47.47 config model | log
Twins-UPerNet (8x2) SVT-B 512x512 160000 6.77 12.66 48.04 48.87 config model | log
Twins-FPN SVT-L 512x512 80000 11.20 17.80 46.55 47.74 config model | log
Twins-UPerNet (8x2) SVT-L 512x512 160000 8.41 10.73 49.65 50.63 config model | log

Note:

  • 8x2 means 8 GPUs with 2 samples per GPU in training. Default setting of Twins on ADE20K is 8 GPUs with 4 samples per GPU in training.
  • UPerNet and FPN are decoder heads utilized in corresponding Twins model, which is UPerHead and FPNHead, respectively. Specifically, models in official repo all use UPerHead.