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Head-Free Lightweight Semantic Segmentation with Linear Transformer

This repository contains the official Pytorch implementation of training & evaluation code and the pretrained models for AFFormer.🔥🔥

Figure 1: Performance of AFFormer.

AFFormer is a head-free, lightweight and powerful semantic segmentation method, as shown in Figure 1.

We use MMSegmentation v0.21.1 as the codebase.

Installation

For install and data preparation, please refer to the guidelines in MMSegmentation v0.21.1.

An example (works for me): CUDA 11.3 and pytorch 1.10.1

pip install mmcv-full==1.5.0
pip install torchvision
pip install timm
pip install opencv-python
pip install einops

Evaluation

Download weights ( google drive | alidrive )

Example: evaluate AFFormer-base on ADE20K :

# Single-gpu testing
bash tools/dist_test.sh ./configs/AFFormer/AFFormer_base_ade20k.py /path/to/checkpoint_file.pth 1 --eval mIoU

# Multi-gpu testing
bash tools/dist_test.sh ./configs/AFFormer/AFFormer_base_ade20k.py /path/to/checkpoint_file.pth <GPU_NUM> --eval mIoU

# Multi-gpu, multi-scale testing
bash tools/dist_test.sh ./configs/AFFormer/AFFormer_base_ade20k.py /path/to/checkpoint_file.pth <GPU_NUM> --eval mIoU --aug-test

Training

Download weights ( google drive | alidrive ) pretrained on ImageNet-1K (refer to deit), and put them in a folder pretrained/.

Example: train AFFormer-base on ADE20K:

# Single-gpu training
bash tools/dist_train.sh ./configs/AFFormer/AFFormer_base_ade20k.py

# Multi-gpu training
bash tools/dist_train.sh ./configs/AFFormer/AFFormer_base_ade20k.py <GPU_NUM>

Visualize

Here is a demo script to test a single image. More details refer to MMSegmentation's Doc.

python demo/image_demo.py ${IMAGE_FILE} ${CONFIG_FILE} ${CHECKPOINT_FILE} [--device ${DEVICE_NAME}] [--palette-thr ${PALETTE}]

Example: visualize SegFormer-B1 on CityScapes:

python demo/image_demo.py demo/demo.png local_configs/segformer/B1/segformer.b1.512x512.ade.160k.py \
/path/to/checkpoint_file --device cuda:0 --palette cityscapes

License

The code is released under the MIT license.

Copyright

Copyright (C) 2010-2021 Alibaba Group Holding Limited.

Citation

If you find this work helpful to your research, please consider citing the paper:

@inproceedings{dong2023afformer,
  title={AFFormer: Head-Free Lightweight Semantic Segmentation with Linear Transformer},
  author={Bo, Dong and Pichao, Wang and Fan Wang},
  booktitle={Proceedings of the AAAI Conference on Artificial Intelligence},
  pages={},
  year={2023}
}