# ViTDet

## Description

This is an implementation of [ViTDet](https://github.com/facebookresearch/detectron2/tree/main/projects/ViTDet) based on [MMDetection](https://github.com/facebookresearch/detectron2/tree/main/projects/ViTDet), [MMCV](https://github.com/open-mmlab/mmcv), and [MMEngine](https://github.com/open-mmlab/mmengine).

## Usage

### Training commands

Follow original [setting](https://github.com/facebookresearch/detectron2/tree/main/projects/ViTDet), this project is trained with total batch size of 64 (16 GPU with 4 images per GPU).

In MMDetection's root directory, run the following command to train the model:

```bash
GPUS=${GPUS} ./tools/slurm_train.sh ${PARTITION} ${JOB_NAME} ${CONFIG_FILE} ${WORK_DIR}
```

Below is an example of using 16 GPUs to train VitDet on a Slurm partition named _dev_, and set the work-dir to some shared file systems.

```shell
GPUS=16 ./tools/slurm_train.sh dev vitdet_mask_b projects/ViTDet/configs/vitdet_mask-rcnn_vit-b-mae_lsj-100e.py /nfs/xxxx/vitdet_mask-rcnn_vit-b-mae_lsj-100e
```

### Testing commands

In MMDetection's root directory, run the following command to test the model:

```bash
python tools/test.py projects/ViTDet/configs/vitdet_mask-rcnn_vit-b-mae_lsj-100e.py ${CHECKPOINT_PATH}
```

## Results

Based on mmdetection, this project almost aligns the test and train accuracy of the [ViTDet](https://github.com/facebookresearch/detectron2/tree/main/projects/ViTDet).

|                           Method                           | Backbone | Pretrained Model |  Training set  |   Test set   | Epoch | Val Box AP | Val Mask  AP |                                                                                                                                                               Download                                                                                                                                                                |
| :--------------------------------------------------------: | :------: | :--------------: | :------------: | :----------: | :---: | :--------: | :----------: | :-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| [ViTDet](./configs/vitdet_mask-rcnn_vit-b-mae_lsj-100e.py) |  ViT-B   |       MAE        | COCO2017 Train | COCO2017 Val |  100  |    51.6    |     45.7     | [model](https://download.openmmlab.com/mmdetection/v3.0/vitdet/vitdet_mask-rcnn_vit-b-mae_lsj-100e/vitdet_mask-rcnn_vit-b-mae_lsj-100e_20230328_153519-e15fe294.pth) / [log](https://download.openmmlab.com/mmdetection/v3.0/vitdet/vitdet_mask-rcnn_vit-b-mae_lsj-100e/vitdet_mask-rcnn_vit-b-mae_lsj-100e_20230328_153519.log.json) |

**Note**:

1. The mask AP is lower than official [repo](https://github.com/facebookresearch/detectron2/tree/main/projects/ViTDet) slightly
2. other model vision will release code and weights in the future

## Citation

```latex
@article{li2022exploring,
  title={Exploring plain vision transformer backbones for object detection},
  author={Li, Yanghao and Mao, Hanzi and Girshick, Ross and He, Kaiming},
  journal={arXiv preprint arXiv:2203.16527},
  year={2022}
}
```

## Checklist

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- [x] Milestone 1: PR-ready, and acceptable to be one of the `projects/`.

  - [x] Finish the code

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  - [x] Basic docstrings & proper citation

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  - [x] Test-time correctness

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- [x] Milestone 2: Indicates a successful model implementation.

  - [x] Training-time correctness

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- [ ] Milestone 3: Good to be a part of our core package!

  - [ ] Type hints and docstrings

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  - [ ] Code polishing

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  - [ ] Metafile.yml

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