README - Mmdetection

Description

This is an implementation of DiffusionDet based on MMDetection, MMCV, and MMEngine.

Usage

Comparison of results

Download the DiffusionDet released model.
Convert model from DiffusionDet version to MMDetection version. We give a sample script to convert DiffusionDet-resnet50 model. Users can download the corresponding models from here.
shell
```
python projects/DiffusionDet/model_converters/diffusiondet_resnet_to_mmdet.py ${DiffusionDet ckpt path} ${MMDetectron ckpt path}
```

Testing the model in MMDetection.

shell

python tools/test.py projects/DiffusionDet/configs/diffusiondet_r50_fpn_500-proposals_1-step_crop-ms-480-800-450k_coco.py ${CHECKPOINT_PATH}

Note: During inference time, DiffusionDet will randomly generate noisy boxes, which may affect the AP results. If users want to get the same result every inference time, setting seed is a good way. We give a table to compare the inference results on ResNet50-500-proposals between DiffusionDet and MMDetection.

Config	Step	AP
DiffusionDet (released results)	1	45.5
DiffusionDet (seed=0)	1	45.66
MMDetection (seed=0)	1	45.7
MMDetection (random seed)	1	45.6~45.8
DiffusionDet (released results)	4	46.1
DiffusionDet (seed=0)	4	46.38
MMDetection (seed=0)	4	46.4
MMDetection (random seed)	4	46.2~46.4

seed=0 means hard set seed before generating random boxes.

python

# hard set seed=0 before generating random boxes
seed = 0
random.seed(seed)
torch.manual_seed(seed)
# torch.cuda.manual_seed(seed)
torch.cuda.manual_seed_all(seed)
...
noise_bboxes_raw = torch.randn(
    (self.num_proposals, 4),
    device=device)
...

random seed means do not hard set seed before generating random boxes.

Training commands

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

bash

python tools/train.py projects/DiffusionDet/configs/diffusiondet_r50_fpn_500-proposals_1-step_crop-ms-480-800-450k_coco.py

For multi-gpu training, run:

bash

python -m torch.distributed.launch --nnodes=1 --node_rank=0 --nproc_per_node=${NUM_GPUS} --master_port=29506 --master_addr="127.0.0.1" tools/train.py projects/DiffusionDet/configs/diffusiondet_r50_fpn_500-proposals_1-step_crop-ms-480-800-450k_coco.py

Testing commands

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

bash

# for 1 step inference
# test command
python tools/test.py projects/DiffusionDet/configs/diffusiondet_r50_fpn_500-proposals_1-step_crop-ms-480-800-450k_coco.py ${CHECKPOINT_PATH}

# for 4 steps inference

# test command
python tools/test.py projects/DiffusionDet/configs/diffusiondet_r50_fpn_500-proposals_1-step_crop-ms-480-800-450k_coco.py ${CHECKPOINT_PATH} --cfg-options model.bbox_head.sampling_timesteps=4

Note: There is no difference between 1 step or 4 steps (or other multi-step) during training. Users can set different steps during inference through --cfg-options model.bbox_head.sampling_timesteps=${STEPS}, but larger sampling_timesteps will affect the inference time.

Results

Here we provide the baseline version of DiffusionDet with ResNet50 backbone.

To find more variants, please visit the official model zoo.

Backbone	Style	Lr schd	AP (Step=1)	AP (Step=4)	Config	Download
R-50	PyTorch	450k	44.5	46.2	config	model \| log

License

DiffusionDet is under the CC-BY-NC 4.0 license. Users should be careful about adopting these features in any commercial matters.

Citation

If you find DiffusionDet is useful in your research or applications, please consider giving a star 🌟 to the official repository and citing DiffusionDet by the following BibTeX entry.

BibTeX

@article{chen2022diffusiondet,
      title={DiffusionDet: Diffusion Model for Object Detection},
      author={Chen, Shoufa and Sun, Peize and Song, Yibing and Luo, Ping},
      journal={arXiv preprint arXiv:2211.09788},
      year={2022}
}

Checklist