Introduction

MutualGuide is a compact object detector specially designed for edge computing devices. Comparing to existing detectors, this repo contains two key features.

Firstly, the Mutual Guidance mecanism assigns labels to the classification task based on the prediction on the localization task, and vice versa, alleviating the misalignment problem between both tasks; Secondly, the teacher-student prediction disagreements guides the knowledge transfer in a feature-based detection distillation framework, thereby reducing the performance gap between both models.

For more details, please refer to our ACCV paper and BMVC paper.

Planning

• Train medium and large models.
• Add SIOU loss.
• Add CspDarknet backbone.
• Add RepVGG backbone.
• Add ShuffleNetV2 backbone.
• Add SwinTransformer backbone.
• Add TensorRT transform code for inference acceleration.
• Add vis function to plot detection results.
• Add custom dataset training (annotations in XML format).
• Add PolyLoss, improve mAP by ~0.3%.

Benchmark

Backbone	Size	APval 0.5:0.95	APval 0.5	APval 0.75	APval small	APval medium	APval large	Params (M)	FLOPs (G)	Speed (ms)
cspdarknet-0.75	640x640	43.0	61.1	46.2	24.2	50.0	59.9	24.32	24.02	11.4(3060)
cspdarknet-0.5	640x640	40.4	58.4	43.3	21.0	46.4	58.0	17.40	12.67	6.5(3060)
resnet18	640x640	40.4	58.5	43.3	19.9	46.5	58.9	22.09	22.95	8.5(3060)
repvgg-A0	640x640	39.9	58.2	42.5	20.3	46.1	57.9	12.30	18.40	7.5(3060)
shufflenet-1.5	640x640	35.7	53.9	37.9	16.5	41.3	53.5	2.55	2.65	5.6(3060)
shufflenet-1.0	640x640	31.8	49.0	33.1	13.6	35.8	48.4	1.50	1.47	5.4(3060)

Remarks:

• The precision is measured on the COCO2017 Val dataset.
• The inference runtime is measured by Pytorch framework (without TensorRT acceleration) on a GTX 3060 GPU, and the post-processing time (e.g., NMS) is not included (i.e., we measure the model inference time).
• To dowload from Baidu cloud, go to this link (password: mugu).

Datasets

First download the COCO2017 dataset, you may find the sripts in data/scripts/ helpful. Then modify the parameter self.root in data/coco.py to the path of COCO dataset:

self.root=os.path.join("/home/heng/Documents/Datasets/", "COCO/")

Remarks:

• For training on custom dataset, first modify the dataset path and categories XML_CLASSES in data/xml_dataset.py. Then apply --dataset XML.

Training

For training with Mutual Guide:

$ python3 train.py --neck ssd --backbone vgg16 --dataset COCO
fpn resnet34 VOC
pafpn repvgg-A2 XML
cspdarknet-0.75
shufflenet-1.0
swin-T

For knowledge distillation using PDF-Distil:

$ python3 distil.py --neck ssd --backbone vgg11 --dataset COCO --kd pdf
fpn resnet18 VOC
pafpn repvgg-A1 XML
cspdarknet-0.5
shufflenet-0.5

Remarks:

• For training without MutualGuide, just use the --mutual_guide False;
• For training on custom dataset, convert your annotations into XML format and use the parameter --dataset XML. An example is given in datasets/XML/;
• For knowledge distillation with traditional MSE loss, just use parameter --kd mse;
• The default folder to save trained model is weights/.

Evaluation

Every time you want to evaluate a trained network:

$ python3 test.py --neck ssd --backbone vgg11 --dataset COCO --trained_model path_to_saved_weights --vis
fpn resnet18 VOC
pafpn repvgg-A1 XML
cspdarknet-0.5
shufflenet-0.5

Remarks:

• It will directly print the mAP, AP50 and AP50 results on COCO2017 Val;
• Add parameter --vis to draw detection results. They will be saved in vis/VOC/ or vis/COCO/ or vis/XML/;

Citing us

Please cite our papers in your publications if they help your research:

@InProceedings{Zhang_2020_ACCV,
author = {Zhang, Heng and Fromont, Elisa and Lefevre, Sebastien and Avignon, Bruno},
title = {Localize to Classify and Classify to Localize: Mutual Guidance in Object Detection},
booktitle = {Proceedings of the Asian Conference on Computer Vision (ACCV)},
month = {November},
year = {2020}
}
@InProceedings{Zhang_2021_BMVC,
author = {Zhang, Heng and Fromont, Elisa and Lefevre, Sebastien and Avignon, Bruno},
title = {PDF-Distil: including Prediction Disagreements in Feature-based Distillation for object detection},
booktitle = {Proceedings of the British Machine Vision Conference (BMVC)},
month = {November},
year = {2021}
}

Acknowledgement

This project contains pieces of code from the following projects: ssd.pytorch, rfbnet, mmdetection and yolox.