Pair then Relation: Pair-Net for Panoptic Scene Graph Generation

Jinghao Wang*,  Zhengyu Wen*,  Xiangtai Li,  Zujing Guo,  Jingkang Yang,  Ziwei Liu^✉
S-Lab, Nanyang Technological University
^* Equal Contribution  ^✉ Corresponding Author

arXiv

Abstract

Panoptic Scene Graph (PSG) is a challenging task in Scene Graph Generation (SGG) that aims to create a more comprehensive scene graph representation using panoptic segmentation instead of boxes. Compared to SGG, PSG has several challenging problems: pixel-level segment outputs and full relationship exploration (It also considers thing and stuff relation). Thus, current PSG methods have limited performance, which hinders downstream tasks or applications. The goal of this work aims to design a novel and strong baseline for PSG. To achieve that, we first conduct an in-depth analysis to identify the bottleneck of the current PSG models, finding that inter-object pair-wise recall is a crucial factor that was ignored by previous PSG methods. Based on this and the recent query-based frameworks, we present a novel framework: Pair then Relation (Pair-Net), which uses a Pair Proposal Network (PPN) to learn and filter sparse pair-wise relationships between subjects and objects. Moreover, we also observed the sparse nature of object pairs for both Motivated by this, we design a lightweight Matrix Learner within the PPN, which directly learn pair-wised relationships for pair proposal generation. Through extensive ablation and analysis, our approach significantly improves upon leveraging the segmenter solid baseline. Notably, our method achieves new state-of-the-art results on the PSG benchmark, with over 10% absolute gains compared to PSGFormer. The code of this paper is publicly available at https://github.com/king159/Pair-Net.

Codebase Structure

Data Preparation

psg.json file can be downloaded from OpenPSG, and the coco dataset can be downloaded from COCO 2017.

The resulting directory structure should be as follows:

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├── configs
├── data
│   ├── coco
│   │   ├── annotations
|   │   │   ├── panoptic_train2017
|   │   │   ├── panoptic_val2017
│   │   ├── train2017
│   │   └── val2017
│   └── psg
│       ├── psg.json
├── pretrain
├── pairnet
├── scripts
├── tools
│   ├── train.py
│   ├── test.py
├── work_dirs
├── ...

Environment Setup

We recommend using Anaconda to set up the environment:

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conda install pytorch==1.13.1 torchvision pytorch-cuda=11.7 -c pytorch -c nvidia -y
yes | pip install mmcv-full==1.7.0 -f https://download.openmmlab.com/mmcv/dist/cu117/torch1.13/index.html
conda install scipy -c conda-forge -y
yes | pip install mmcls==0.23.2
yes | pip install mmdet==2.25.1
yes | pip install git+https://github.com/facebookresearch/detectron2.git
yes | pip install git+https://github.com/cocodataset/panopticapi.git
yes | pip install wandb

Pair-Net

Code and trained models will be released soon.

Architecture

Training

#single GPU
PYTHONPATH='.':$PYTHONPATH python configs/mask2former/pairnet.py

#multi GPU
PYTHONPATH='.':$PYTHONPATH bash tools/dist_train.sh configs/mask2former/pairnet.py 4

Testing

PYTHONPATH='.':$PYTHONPATH \
python tools/test.py \
    configs/deformable_detr/od_r101_vg.py \
    pretrain/deformable_detr_r101_vg.pth \
    --eval bbox

PYTHONPATH='.':$PYTHONPATH \
python tools/test.py \
    configs/mask2former/pairnet.py \
    work_dirs/3090_simpleconv/latest.pth \
    --eval sgdet

Results

BackBone	Detector	Model	mR@20	mR@50	mR@100	R@20	R@50	R@100	Checkpoint
ResNet-50	Faster R-CNN	IMP	6.5	7.1	7.2	16.5	18.2	18.6	-
ResNet-50	Faster R-CNN	MOTIFS	9.1	9.6	9.7	20.0	21.7	22.0	-
ResNet-50	Faster R-CNN	VCTree	9.7	10.2	10.2	20.6	22.1	22.5	-
ResNet-50	Faster R-CNN	GPS-Net	7.0	7.5	7.7	17.8	19.6	20.1	-
ResNet-50	DETR	PSGFormer	14.5	17.4	18.7	18.0	19.6	20.1	-
ResNet-50	Mask2Former	PSGFormer+	16.6	19.4	20.3	18.9	21.5	22.4	-
ResNet-50	Mask2Former	Pair-Net (Ours)	24.7	28.5	30.6	29.6	35.6	39.6	coming soon
Swin-B	Mask2Former	Pair-Net†	25.4	28.2	29.7	33.3	39.3	42.4	coming soon

$^{+}$: Replace the backbone of PSGFormer to Mask2Former. ^†: Pair-Net with Swin-B as backbone.

Acknowledgements

Pair-Net is developed based on MMDetection and OpenPSG. We sincerely appreciate the efforts of the developers from the previous codebases.