Masked Image Modeling with Denoising Contrast

Official PyTorch implementation and pretrained models of "Masked Image Modeling with Denoising Contrast" in International Conference on Learning Representations (ICLR) 2023.

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Model Zoo

• We provide the models fine-tuned on ImageNet1k.

Arch	Epochs	Resolution	Acc@1	Fine-tuned model
ViT-S/16	300	224x224	82.0	model
ViT-B/16	800	224x224	83.7	model
ViT-L/16	800	224x224	85.2	model
ViT-L/16	1600	224x224	85.5	model

Results on ImageNet1K

Visualization

Visualize the self-attention map between [CLS] token and local tokens of the pre-trained ViT-B/16 model on ImageNet-1K, where (a) indicates ConMIM pretraining and (b) indicates the vanilla instance-level contrastive pre-training. Self-attention maps out of 12 attention heads are averaged. It can be observed that ConMIM-pretrained models are much more locally discriminative and aware of the visual context.

Setup

Clone the github repo and install the required packages.

git clone https://github.com/TencentARC/ConMIM.git
pip install -r requirements.txt

For mixed-precision training, please install apex

git clone https://github.com/NVIDIA/apex
cd apex
pip install -v --disable-pip-version-check --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./

Data Preparation

• We use standard ImageNet-1K dataset (http://image-net.org/) for pre-training
• Read from train and val list (download in this link) to boost the speed of reading images from massive small files:

/dataset
└── imagenet1k
    ├── train
    ├── val
    ├── train_map.txt
    └── val_map.txt

• train_map.txt,val_map.txt : which store the relative path in the corresponding zip file and ground truth label, and can be downloaded in this link.

Pre-training on ImageNet-1K

• We pre-train the ViT-L/16 model with 32 NVIDIA A100 GPUs on ImageNet-1K as follows:

OUTPUT_DIR="./output/conmim_pretrained"
DATA_PATH="./dataset/imagenet1k"
mkdir -p $OUTPUT_DIR

python -m torch.distributed.launch $@ run_conmim_pretraining.py \
        --data_path ${DATA_PATH} --output_dir ${OUTPUT_DIR} --mask_ratio 0.75 \
        --model conmim_large_patch16_224 \
        --batch_size 64 --lr 7.5e-4 --warmup_epochs 10 --epochs 1600 \
        --clip_grad 1.0 --drop_path 0 --layer_scale_init_value 1e-5 \
        --mask_type 'random_mps32' \
        --imagenet_default_mean_and_std \
        --save_ckpt_freq 20

Fine-tuning on ImageNet-1K Classification

• We finetune the pre-trained ViT-Base model with 8 NVIDIA A100/V100 GPUs as follows:

CKP="./output/conmim_pretrained/checkpoint_copy-799.pth"
OUTPUT_DIR="./output/conmim_finetuned/"
DATA_PATH="/dataset/imagenet1k/"
mkdir -p $OUTPUT_DIR

python -m torch.distributed.launch --nproc_per_node=8 run_class_finetuning.py \
    --model beit_base_patch16_224 --data_path ${DATA_PATH}\
    --finetune ${CKP} \
    --output_dir ${OUTPUT_DIR} --batch_size 128 --lr 4e-3 --update_freq 1 \
    --warmup_epochs 20 --epochs 100 --layer_decay 0.65 --drop_path 0.1 \
    --weight_decay 0.05 --mixup 0.8 --cutmix 1.0 --nb_classes 1000 --enable_deepspeed \
    --imagenet_default_mean_and_std

Fine-tuning on ADE20K Semantic Segmentation

We follow the BEiT to complete our experiments

Fine-tuning on COCO Detection and Segmentation

We follow the MIMDet to complete our experiments

Acknowledgement

This repository is built using the BEiT repository, the mc-BEiT repository, the timm library, the DeiT repository, and the MIMDet repository.

Citation

If you find our work is useful for your research, please kindly cite our paper.

@article{yi2022masked,
  title={Masked image modeling with denoising contrast},
  author={Yi, Kun and Ge, Yixiao and Li, Xiaotong and Yang, Shusheng and Li, Dian and Wu, Jianping and Shan, Ying and Qie, Xiaohu},
  journal={International Conference on Learning Representations},
  year={2023}
}

Contact

If you have any questions, you can contact me from the email: kunyi@tencent.com or laneyikun@foxmail.com