TokenCut

Pytorch implementation of Tokencut:

Self-supervised Transformers for Unsupervised Object Discovery using Normalized Cut

Yangtao Wang, Xi Shen, Shell Xu Hu, Yuan Yuan, James Crowley, Dominique Vaufreydaz

If our project is helpful for your research, please consider citing :

@article{wang2022tokencut,
          title={Self-supervised Transformers for Unsupervised Object Discovery using Normalized Cut},
          author={Wang, Yangtao and Shen, Xi and Hu, Shell Xu and Yuan, Yuan and Crowley, James and Vaufreydaz, Dominique},
          journal={arXiv}
          year={2022}
        }

Table of Content

1. Updates
2. Installation
- 2.1 Dependencies
- 2.2 Data
3. Quick Start
- 3.1 Detecting an object in one image
- 3.2 Segmenting a salient region in one image
4. Evaluation
5. Acknowledgement

1. Updates

02/21/2022 Initial commit: Code of TokenCut is released, including evaluation of unsupervised object discovery, unsupervised saliency object detection, weakly supervised object locolization.

2. Installation

2.1 Dependencies

This code was implemented with Python 3.7, PyTorch 1.7.1 and CUDA 11.2. Please refer to the official installation. If CUDA 10.2 has been properly installed :

pip install torch==1.7.1 torchvision==0.8.2

In order to install the additionnal dependencies, please launch the following command:

pip install -r requirements.txt

2.2 Data

We provide quick download commands in DOWNLOAD_DATA.md for VOC2007, VOC2012, COCO, CUB, ImageNet, ECSSD, DUTS and DUT-OMRON as well as DINO checkpoints.

3. Quick Start

3.1 Detecting an object in one image

We provide TokenCut visualization for bounding box prediction and attention map. Using all for all visualization results.

python main_tokencut.py --image_path examples/VOC07_000036.jpg --visualize pred
python main_tokencut.py --image_path examples/VOC07_000036.jpg --visualize attn
python main_tokencut.py --image_path examples/VOC07_000036.jpg --visualize all

3.2 Segmenting a salient region in one image

We provide TokenCut segmentation results as follows:

cd unsupervised_saliency_detection 
python get_saliency.py --sigma-spatial 16 --sigma-luma 16 --sigma-chroma 8 --vit-arch small --patch-size 16 --img-path ../examples/VOC07_000036.jpg --out-dir ./output

4. Evaluation

Following are the different steps to reproduce the results of TokenCut presented in the paper.

4.1 Unsupervised object discovery

PASCAL-VOC

In order to apply TokenCut and compute corloc results (VOC07 68.8, VOC12 72.1), please launch:

python main_tokencut.py --dataset VOC07 --set trainval
python main_tokencut.py --dataset VOC12 --set trainval

If you want to extract Dino features, which corresponds to the KEY features in DINO:

mkdir features
python main_lost.py --dataset VOC07 --set trainval --save-feat-dir features/VOC2007

COCO

Results are provided given the 2014 annotations following previous works. The following command line allows you to get results on the subset of 20k images of the COCO dataset (corloc 58.8), following previous litterature. To be noted that the 20k images are a subset of the train set.

python main_tokencut.py --dataset COCO20k --set train

Different models

We have tested the method on different setups of the VIT model, corloc results are presented in the following table (more can be found in the paper).

arch	pre-training	dataset
		VOC07	VOC12	COCO20k
ViT-S/16	DINO	68.8	72.1	58.8
ViT-S/8	DINO	67.3	71.6	60.7
ViT-B/16	DINO	68.8	72.4	59.0

Previous results on the dataset VOC07 can be obtained by launching:

python main_tokencut.py --dataset VOC07 --set trainval #VIT-S/16
python main_tokencut.py --dataset VOC07 --set trainval --patch_size 8 #VIT-S/8
python main_tokencut.py --dataset VOC07 --set trainval --arch vit_base #VIT-B/16

4.2 Unsupervised saliency detection

To evaluate on ECSSD, DUTS, DUT_OMRON dataset:

python get_saliency.py --out-dir ECSSD --sigma-spatial 16 --sigma-luma 16 --sigma-chroma 8 --nb-vis 1 --vit-arch small --patch-size 16 --dataset ECSSD

python get_saliency.py --out-dir DUTS --sigma-spatial 16 --sigma-luma 16 --sigma-chroma 8 --nb-vis 1 --vit-arch small --patch-size 16 --dataset DUTS

python get_saliency.py --out-dir DUT --sigma-spatial 16 --sigma-luma 16 --sigma-chroma 8 --nb-vis 1 --vit-arch small --patch-size 16 --dataset DUT

This should give:

Method	ECSSD			DUTS			DUT-OMRON
	maxF	IoU	Acc	maxF	IoU	Acc	maxF	IoU	Acc
TokenCut	80.3	71.2	91.8	67.2	57.6	90.3	60.0	53.3	88.0
TokenCut + BS	87.4	77.2	93.4	75.5	62,4	91.4	69.7	61.8	89.7

4.3 Weakly supervised object detection

Fintune DINO small on CUB

To finetune ViT-S/16 on CUB on a single node with 4 gpus for 1000 epochs run:

python -m torch.distributed.launch --nproc_per_node=4 main.py --data_path /path/to/data --batch_size_per_gpu 256 --dataset cub --weight_decay 0.005 --pretrained_weights ./dino_deitsmall16_pretrain.pth --epoch 1000 --output_dir ./path/to/checkpoin --lr 2e-4 --warmup-epochs 50 --num_labels 200 --num_workers 16 --n_last_blocks 1 --avgpool_patchtokens true --arch vit_small --patch_size 16

Evaluation on CUB

To evaluate a fine-tuned ViT-S/16 on CUB val with a single GPU run:

python eval.py --pretrained_weights ./path/to/checkpoint --dataset cub --data_path ./path/to/data --batch_size_per_gpu 1 --no_center_crop