VoVNet-v2 backbone networks in Detectron2

Efficient Backbone Network for Object Detection and Segmentation

[CenterMask(code)][CenterMask2(code)] [VoVNet-v1(arxiv)] [VoVNet-v2(arxiv)] [BibTeX]

In this project, we release code for VoVNet-v2 backbone network (introduced by CenterMask) in detectron2 as a extention form. VoVNet can extract diverse feature representation efficiently by using One-Shot Aggregation (OSA) module that concatenates subsequent layers at once. Since the OSA module can capture multi-scale receptive fields, the diversifed feature maps allow object detection and segmentation to address multi-scale objects and pixels well, especially robust on small objects. VoVNet-v2 improves VoVNet-v1 by adding identity mapping that eases the optimization problem and effective SE (Squeeze-and-Excitation) that enhances the diversified feature representation.

Highlight

Compared to ResNe(X)t backbone

• Efficient : Faster speed
• Accurate : Better performance, especially small object.

Update

• Lightweight-VoVNet-19 has been released. (19/02/2020)
• VoVNetV2-19-FPNLite has been released. (22/01/2020)
• centermask2 has been released. (20/02/2020)

Results on MS-COCO in Detectron2

Note

We measure the inference time of all models with batch size 1 on the same V100 GPU machine.
We train all models using V100 8GPUs.

• pytorch1.3.1
• CUDA 10.1
• cuDNN 7.3

Faster R-CNN

Lightweight-VoVNet with FPNLite

Backbone	Param.	lr sched	inference time	AP	APs	APm	APl	download
MobileNetV2	3.5M	3x	0.022	33.0	19.0	35.0	43.4	model | metrics
V2-19	11.2M	3x	0.034	38.9	24.8	41.7	49.3	model | metrics
V2-19-DW	6.5M	3x	0.027	36.7	22.7	40.0	46.0	model | metrics
V2-19-Slim	3.1M	3x	0.023	35.2	21.7	37.3	44.4	model | metrics
V2-19-Slim-DW	1.8M	3x	0.022	32.4	19.1	34.6	41.8	model | metrics

• DW and Slim denote depthwise separable convolution and a thiner model with half the channel size, respectively.

Backbone	Param.	lr sched	inference time	AP	APs	APm	APl	download
V2-19-FPN	37.6M	3x	0.040	38.9	24.9	41.5	48.8	model | metrics
R-50-FPN	51.2M	3x	0.047	40.2	24.2	43.5	52.0	model | metrics
V2-39-FPN	52.6M	3x	0.047	42.7	27.1	45.6	54.0	model | metrics
R-101-FPN	70.1M	3x	0.063	42.0	25.2	45.6	54.6	model | metrics
V2-57-FPN	68.9M	3x	0.054	43.3	27.5	46.7	55.3	model | metrics
X-101-FPN	114.3M	3x	0.120	43.0	27.2	46.1	54.9	model | metrics
V2-99-FPN	96.9M	3x	0.073	44.1	28.1	47.0	56.4	model | metrics

Mask R-CNN

Backbone	lr sched	inference time	box AP	box APs	box APm	box APl	mask AP	mask APs	mask APm	mask APl	download
V2-19-FPNLite	3x	0.036	39.7	25.1	42.6	50.8	36.4	19.9	38.8	50.8	model | metrics
V2-19-FPN	3x	0.044	40.1	25.4	43.0	51.0	36.6	19.7	38.7	51.2	model | metrics
R-50-FPN	3x	0.055	41.0	24.9	43.9	53.3	37.2	18.6	39.5	53.3	model | metrics
V2-39-FPN	3x	0.052	43.8	27.6	47.2	55.3	39.3	21.4	41.8	54.6	model | metrics
R-101-FPN	3x	0.070	42.9	26.4	46.6	56.1	38.6	19.5	41.3	55.3	model | metrics
V2-57-FPN	3x	0.058	44.2	28.2	47.2	56.8	39.7	21.6	42.2	55.6	model | metrics
X-101-FPN	3x	0.129	44.3	27.5	47.6	56.7	39.5	20.7	42.0	56.5	model | metrics
V2-99-FPN	3x	0.076	44.9	28.5	48.1	57.7	40.3	21.7	42.8	56.6	model | metrics

Panoptic-FPN on COCO

Name	lr sched	inference time (s/im)	box AP	mask AP	PQ	download
R-50-FPN	3x	0.063	40.0	36.5	41.5	model | metrics
V2-39-FPN	3x	0.063	42.8	38.5	43.4	model | metrics
R-101-FPN	3x	0.078	42.4	38.5	43.0	model | metrics
V2-57-FPN	3x	0.070	43.4	39.2	44.3	model | metrics

Using this command with --num-gpus 1

python /path/to/vovnet-detectron2/train_net.py --config-file /path/to/vovnet-detectron2/configs/<config.yaml> --eval-only --num-gpus 1 MODEL.WEIGHTS <model.pth>

Installation

As this vovnet-detectron2 is implemented as a extension form (detectron2/projects) upon detectron2, you just install detectron2 following INSTALL.md.

Prepare for coco dataset following this instruction.

Training

ImageNet Pretrained Models

We provide backbone weights pretrained on ImageNet-1k dataset.

• VoVNetV2-19-Slim-DW
• VoVNetV2-19-Slim
• VoVNetV2-19-DW
• VoVNetV2-19
• VoVNetV2-39
• VoVNetV2-57
• VoVNetV2-99

To train a model, run

python /path/to/vovnet-detectron2/train_net.py --config-file /path/to/vovnet-detectron2/configs/<config.yaml>

For example, to launch end-to-end Faster R-CNN training with VoVNetV2-39 backbone on 8 GPUs, one should execute:

python /path/to/vovnet-detectron2/train_net.py --config-file /path/to/vovnet-detectron2/configs/faster_rcnn_V_39_FPN_3x.yaml --num-gpus 8

Evaluation

Model evaluation can be done similarly:

python /path/to/vovnet-detectron2/train_net.py --config-file /path/to/vovnet-detectron2/configs/faster_rcnn_V_39_FPN_3x.yaml --eval-only MODEL.WEIGHTS <model.pth>

TODO

• Adding Lightweight models
• Applying VoVNet for other meta-architectures

Citing VoVNet

If you use VoVNet, please use the following BibTeX entry.

@inproceedings{lee2019energy,
  title = {An Energy and GPU-Computation Efficient Backbone Network for Real-Time Object Detection},
  author = {Lee, Youngwan and Hwang, Joong-won and Lee, Sangrok and Bae, Yuseok and Park, Jongyoul},
  booktitle = {Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition Workshops},
  year = {2019}
}

@article{lee2019centermask,
  title={CenterMask: Real-Time Anchor-Free Instance Segmentation},
  author={Lee, Youngwan and Park, Jongyoul},
  booktitle={CVPR},
  year={2020}
}