SimMIM

By Zhenda Xie*, Zheng Zhang*, Yue Cao*, Yutong Lin, Jianmin Bao, Zhuliang Yao, Qi Dai and Han Hu*.

This repo is the official implementation of "SimMIM: A Simple Framework for Masked Image Modeling".

Updates

09/29/2022

SimMIM was merged to Swin Transformer repo on GitHub.

03/02/2022

SimMIM got accepted by CVPR 2022. SimMIM was used in "Swin Transformer V2" to alleviate the data hungry problem for large-scale vision model training.

12/09/2021

Initial commits:

1. Pre-trained and fine-tuned models on ImageNet-1K (Swin Base, Swin Large, and ViT Base) are provided.
2. The supported code for ImageNet-1K pre-training and fine-tuneing is provided.

Introduction

SimMIM is initially described in arxiv, which serves as a simple framework for masked image modeling. From systematically study, we find that simple designs of each component have revealed very strong representation learning performance: 1) random masking of the input image with a moderately large masked patch size (e.g., 32) makes a strong pre-text task; 2) predicting raw pixels of RGB values by direct regression performs no worse than the patch classification approaches with complex designs; 3) the prediction head can be as light as a linear layer, with no worse performance than heavier ones.

Main Results on ImageNet

Swin Transformer

ImageNet-1K Pre-trained and Fine-tuned Models

name	pre-train epochs	pre-train resolution	fine-tune resolution	acc@1	pre-trained model	fine-tuned model
Swin-Base	100	192x192	192x192	82.8	google/config	google/config
Swin-Base	100	192x192	224x224	83.5	google/config	google/config
Swin-Base	800	192x192	224x224	84.0	google/config	google/config
Swin-Large	800	192x192	224x224	85.4	google/config	google/config
SwinV2-Huge	800	192x192	224x224	85.7	/	/
SwinV2-Huge	800	192x192	512x512	87.1	/	/

Vision Transformer

ImageNet-1K Pre-trained and Fine-tuned Models

name	pre-train epochs	pre-train resolution	fine-tune resolution	acc@1	pre-trained model	fine-tuned model
ViT-Base	800	224x224	224x224	83.8	google/config	google/config

Citing SimMIM

@inproceedings{xie2021simmim,
  title={SimMIM: A Simple Framework for Masked Image Modeling},
  author={Xie, Zhenda and Zhang, Zheng and Cao, Yue and Lin, Yutong and Bao, Jianmin and Yao, Zhuliang and Dai, Qi and Hu, Han},
  booktitle={International Conference on Computer Vision and Pattern Recognition (CVPR)},
  year={2022}
}

Getting Started

Installation

• Install CUDA 11.3 with cuDNN 8 following the official installation guide of CUDA and cuDNN.

• Setup conda environment:

# Create environment
conda create -n SimMIM python=3.8 -y
conda activate SimMIM

# Install requirements
conda install pytorch torchvision torchaudio cudatoolkit=11.3 -c pytorch -y

# 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" ./
cd ..

# Clone SimMIM
git clone https://github.com/microsoft/SimMIM
cd SimMIM

# Install other requirements
pip install -r requirements.txt

Evaluating provided models

To evaluate a provided model on ImageNet validation set, run:

python -m torch.distributed.launch --nproc_per_node <num-of-gpus-to-use> main_finetune.py \
--eval --cfg <config-file> --resume <checkpoint> --data-path <imagenet-path>

For example, to evaluate the Swin Base model on a single GPU, run:

python -m torch.distributed.launch --nproc_per_node 1 main_finetune.py \
--eval --cfg configs/swin_base__800ep/simmim_finetune__swin_base__img224_window7__800ep.yaml --resume simmim_finetune__swin_base__img224_window7__800ep.pth --data-path <imagenet-path>

Pre-training with SimMIM

To pre-train models with SimMIM, run:

python -m torch.distributed.launch --nproc_per_node <num-of-gpus-to-use> main_simmim.py \ 
--cfg <config-file> --data-path <imagenet-path>/train [--batch-size <batch-size-per-gpu> --output <output-directory> --tag <job-tag>]

For example, to pre-train Swin Base for 800 epochs on one DGX-2 server, run:

python -m torch.distributed.launch --nproc_per_node 16 main_simmim.py \ 
--cfg configs/swin_base__800ep/simmim_pretrain__swin_base__img192_window6__800ep.yaml --batch-size 128 --data-path <imagenet-path>/train [--output <output-directory> --tag <job-tag>]

Fine-tuning pre-trained models

To fine-tune models pre-trained by SimMIM, run:

python -m torch.distributed.launch --nproc_per_node <num-of-gpus-to-use> main_finetune.py \ 
--cfg <config-file> --data-path <imagenet-path> --pretrained <pretrained-ckpt> [--batch-size <batch-size-per-gpu> --output <output-directory> --tag <job-tag>]

For example, to fine-tune Swin Base pre-trained by SimMIM on one DGX-2 server, run:

python -m torch.distributed.launch --nproc_per_node 16 main_finetune.py \ 
--cfg configs/swin_base__800ep/simmim_finetune__swin_base__img224_window7__800ep.yaml --batch-size 128 --data-path <imagenet-path> --pretrained <pretrained-ckpt> [--output <output-directory> --tag <job-tag>]

Contributing

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This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Trademarks

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