CO-MOT: Bridging the Gap Between End-to-end and Non-End-to-end Multi-Object Tracking

![arXiv]

This repository is an official implementation of CO-MOT.

TO DO

1. release code of grounded MOT.

Introduction

Bridging the Gap Between End-to-end and Non-End-to-end Multi-Object Tracking.

Abstract. Existing end-to-end Multi-Object Tracking (e2e-MOT) methods have not surpassed non-end-to-end tracking-by-detection methods. One potential reason is its label assignment strategy during training that consistently binds the tracked objects with tracking queries and then assigns the few newborns to detection queries. With one-to-one bipartite matching, such an assignment will yield unbalanced training, i.e., scarce positive samples for detection queries, especially for an enclosed scene, as the majority of the newborns come on stage at the beginning of videos. Thus, e2e-MOT will be easier to yield a tracking terminal without renewal or re-initialization, compared to other tracking-by-detection methods. To alleviate this problem, we present Co-MOT, a simple and effective method to facilitate e2e-MOT by a novel coopetition label assignment with a shadow concept. Specifically, we add tracked objects to the matching targets for detection queries when performing the label assignment for training the intermediate decoders. For query initialization, we expand each query by a set of shadow counterparts with limited disturbance to itself. With extensive ablations, Co-MOT achieves superior performance without extra costs, e.g., 69.4% HOTA on DanceTrack and 52.8% TETA on BDD100K. Impressively, Co-MOT only requires 38% FLOPs of MOTRv2 to attain a similar performance, resulting in the 1.4× faster inference speed.

Main Results

DanceTrack

HOTA	DetA	AssA	MOTA	IDF1	URL
69.9	82.1	58.9	91.2	71.9	model

|VISAM| ||

Installation

The codebase is built on top of Deformable DETR and MOTR.

Requirements

• Install pytorch using conda (optional)

  conda create -n motrv2 python=3.7
  conda activate motrv2
  conda install pytorch=1.8.1 torchvision=0.9.1 cudatoolkit=10.2 -c pytorch

• Other requirements

  pip install -r requirements.txt

• Build MultiScaleDeformableAttention

  cd ./models/ops
  sh ./make.sh

Usage

Dataset preparation

1. Please download DanceTrack and CrowdHuman and unzip them as follows:

/data/Dataset/mot
├── crowdhuman
│   ├── annotation_train.odgt
│   ├── annotation_trainval.odgt
│   ├── annotation_val.odgt
│   └── Images
├── DanceTrack
│   ├── test
│   ├── train
│   └── val
├── det_db_motrv2.json

You may use the following command for generating crowdhuman trainval annotation:

cat annotation_train.odgt annotation_val.odgt > annotation_trainval.odgt

Training

You may download the coco pretrained weight from Deformable DETR (+ iterative bounding box refinement), and modify the --pretrained argument to the path of the weight. Then training MOTR on 8 GPUs as following:

./tools/train.sh configs/motrv2ch_uni5cost3ggoon.args

Inference on DanceTrack Test Set

# run a simple inference on our pretrained weights
./tools/simple_inference.sh configs/motrv2ch_uni5cost3ggoon.args ./motrv2_dancetrack.pth

# Or evaluate an experiment run
# ./tools/eval.sh exps/motrv2/run1

# then zip the results
zip motrv2.zip tracker/ -r

Acknowledgements

• MOTR
• ByteTrack
• YOLOX
• OC-SORT
• DanceTrack
• BDD100K
• MOTRv2
• CO-MOT