News | Abstract | Method | Results | Usage | Statement

17/05/2024

• 🚀 The paper is post on arxiv now! The code is released.

17/04/2024

• 🎉 🎉 LeMeViT is accepted by IJCAI 2024! 🎉 🎉

Relevant Project:

✨ RSP: An Empirical Study of Remote Sensing Pretraining | Paper | Code

✨ RVSA: Advancing Plain Vision Transformer Towards Remote Sensing Foundation Model | Paper | Code

Here's the comparison of LemeViT with other state-of-the-arts on ImageNet-1K, i.e. PVTv2, Swin Transformer, BiFormer and PacaViT.

Due to spatial redundancy in remote sensing images, sparse tokens containing rich information are usually involved in self-attention (SA) to reduce the overall token numbers within the calculation, avoiding the high computational cost issue in Vision Transformers. However, such methods usually obtain sparse tokens by hand-crafted or parallel-unfriendly designs, posing a challenge to reach a better balance between efficiency and performance. Different from them, this paper proposes to use learnable meta tokens to formulate sparse tokens, which effectively learn key information meanwhile improving the inference speed. Technically, the meta tokens are first initialized from image tokens via cross-attention. Then, we propose Dual Cross-Attention (DCA) to promote information exchange between image tokens and meta tokens, where they serve as query and key (value) tokens alternativelyin a dual-branch structure, significantly reducingthe computational complexity compared to self-attention. By employing DCA in the early stages with dense visual tokens, we obtain the hierarchical architecture LeMeViT with various sizes. Experimental results in classification and dense prediction tasks show that LeMeViT has a significant 1.7× speedup, fewer parameters, and competitive performance compared to the baseline models, and achieves a better trade-off between efficiency and performance.

⏰ All the weights will be released soon.

The script examples can be found in the directory scripts, which can be modified and run easily.

Such as:

# For classification & scene recognition training
bash scripts/train.sh

# For semantic segmentation evaluation
bash scripts/test_ss.sh 

Environment: Python=3.8, Pytorch=2.1.0, CUDA=12.2

First, install the necessary libraries.

pip install timm=0.9.16
pip install einops

Then, optionally install the following libraries for further acceleration.

# Speed: flash_attn > xformers > torch

pip install flash_attn
pip install xformers

For ImageNet-1K classification, the evaluation script can be:

  python \
    validate.py \
    --data-dir <data_path> \
    --dataset imagenet \
    --model lemevit_small \
    --num-classes 1000 \
    --checkpoint <ckpt_path> \
    --img-size 224 \
    --batch-size <batch_size> \
    --amp \

For MillionAid scene recognition, the evaluation script can be:

  python \
    validate.py \
    --data-dir <data_path> \
    --dataset millionaid \
    --model lemevit_small \
    --num-classes 51 \
    --checkpoint <ckpt_path> \
    --img-size 224 \
    --batch-size <batch_size> \
    --amp \

Also, you can follow script test.sh for recommended usage.

The training script for both classication and scene recognition can be:

CUDA_VISIBLE_DEVICES=<devices_ids> \
  torchrun \
    --rdzv_backend c10d \
    --rdzv-endpoint=localhost:0 \
    --nnodes 1 \
    --nproc_per_node <devices_num> \
    main.py \
    --config <config_file_path> \
    --output <output_path> \
    --experiment <exp_name> \
    --model <model_name> \
    --img-size 224 \
    --batch-size <batch_size> \

Also, you can follow script train.sh for recommended usage.

Since we use OBBDetection and MMSegmenation to implement corresponding detection or segmentation models, we only provide necessary config and backbone files.

The installation and dataset preparation can separately refer OBBDetection-installation and MMSegmentation-installation

Then put these files into corresponding folders.

# For object detection evaluation
bash scripts/test_od.sh

# For object detection training
bash scripts/train_od.sh

# For semantic segmentation evaluation
bash scripts/test_ss.sh

# For semantic segmentation training
bash scripts/train_ss.sh

Please refer to BIT-Readme.md for installing.

# For evaluation
bash scripts/test_cd.sh

# For training
bash scripts/train_cd.sh

This repository is built using the timm, OBBDetection and mmsegmenation library.

This project is for research purpose only.

If you find LeMeViT helpful, please consider giving this repo a star ⭐ and citing:

@inproceedings{jiang_lemevit_2024,
  title={{LeMeViT}: Efficient Vision Transformer with Learnable Meta Tokens for Remote Sensing Image Interpretation},
  author={Jiang, Wentao and Zhang, Jing and Wang, Di and Zhang, Qiming and  Wang, Zengmao and Du, Bo},
  booktitle={International Joint Conference on Artificial Intelligence},
  year={2024}
}

For any other questions please contact jiang_wentao@whu.edu.cn.