Imbalanced Learning for Recognition

This repository contains the code of our papers on the topic of imbalanced learning for recognition.

• The code for our preprint paper "Generalized Parametric Contrastive Learning" is released;
• The code for our preprint paper "Region Rebalance for Long-Tailed Semantic Segmentation" (paper) will be released soon;
• The code for our TPAMI 2022 paper "Residual Learning for Long-tailed recogntion" (paper and code);
• The code for our ICCV 2021 paper "Parametric Contrastive Learning" (paper and code);

Generalized Parametric-Contrastive-Learning

This repository contains the implementation code for ICCV2021 paper Parametric Contrastive Learning (https://arxiv.org/abs/2107.12028) and arXiv paper Generalized Parametric Contrastive Learning (https://arxiv.org/abs/2209.12400).

Full ImageNet Classification and Out-of-Distribution Robustness

CIFAR Classification

Long-tailed Recognition

ImageNet-LT

iNaturalist 2018

Places-LT

Semantic Segmentation

Get Started

Environments

We use python3.8, pytorch 1.8.1, mmcv 1.3.13 and timm==0.3.2. Our code is based on PaCo, MAE, and mmseg.

Train and Evaluation Scripts

On full ImageNet and OOD robustness,

We use 8 Nvidia GForce RTx 3090 GPUs. MAE pretrained models should be downloaded from here.

cd GPaCo/LT
bash sh/ImageNet/train_resnet50.sh
bash sh/ImageNet/eval_resnet50.sh

cd GPaCo/MAE-ViTs
bash sh/finetune_base_mae.sh
bash sh/finetune_base_mae_multitask.sh
bash sh/finetune_base_mae_gpaco.sh
bash sh/finetune_base_mae_gpaco_eval.sh

On imbalanced data,

cd GPaCo/LT
bash sh/LT/ImageNetLT_train_X50_multitask.sh
bash sh/LT/ImageNetLT_train_X50.sh
sh/LT/ImageNetLT_eval_X50.sh

bash sh/LT/Inat_train_R50.sh
sh/LT/Inat_eval_R50.sh

bash sh/LT/PlacesLT_train_R152.sh
bash sh/LT/PlacesLT_eval_R152.sh

On semantic segmentation,

cd GPaCo/Seg/semseg
bash sh/ablation_paco_ade20k/upernet_swinbase_160k_ade20k_paco.sh
bash sh/ablation_paco_coco10k/r50_deeplabv3plus_40k_coco10k_paco.sh
bash sh/ablation_paco_context/r50_deeplabv3plus_40k_context_paco.sh
bash sh/ablation_paco_cityscapes/r50_deeplabv3plus_40k_context.sh

Parametric-Contrastive-Learning

This repository contains the implementation code for ICCV2021 paper:
Parametric Contrastive Learning (https://arxiv.org/abs/2107.12028)

Overview

In this paper, we propose Parametric Contrastive Learning (PaCo) to tackle long-tailed recognition. Based on theoretical analysis, we observe supervised contrastive loss tends to bias on high-frequency classes and thus increases the difficulty of imbalance learning. We introduce a set of parametric class-wise learnable centers to rebalance from an optimization perspective. Further, we analyze our PaCo loss under a balanced setting. Our analysis demonstrates that PaCo can adaptively enhance the intensity of pushing samples of the same class close as more samples are pulled together with their corresponding centers and benefit hard example learning. Experiments on long-tailed CIFAR, ImageNet, Places, and iNaturalist 2018 manifest the new state-of-the-art for long-tailed recognition. On full ImageNet, models trained with PaCo loss surpass supervised contrastive learning across various ResNet backbones.

Results and Pretrained models

Full ImageNet (Balanced setting)

ImageNet-LT (Imbalance setting)

iNaturalist 2018 (Imbalanced setting)

Places-LT (Imbalanced setting)

Get Started

For full ImageNet, ImageNet-LT, iNaturalist 2018, Places-LT training and evaluation. Note that PyTorch>=1.6. All experiments are conducted on 4 GPUs. If you have more GPU resources, please make sure that the learning rate should be linearly scaled and 32 images per gpu is recommented.

cd Full-ImageNet
bash sh/train_resnet50.sh
bash sh/eval_resnet50.sh

cd LT
bash sh/ImageNetLT_train_R50.sh
bash sh/ImageNetLT_eval_R50.sh
bash sh/PlacesLT_train_R152.sh
bash sh/PlacesLT_eval_R152.sh

cd LT
bash sh/CIFAR100_train_imb0.1.sh

Contact

If you have any questions, feel free to contact us through email ([email protected]) or Github issues. Enjoy!

BibTex

If you find this code or idea useful, please consider citing our work:

@article{cui2022generalized,
  title={Generalized Parametric Contrastive Learning},
  author={Cui, Jiequan and Zhong, Zhisheng and Tian, Zhuotao and Liu, Shu and Yu, Bei and Jia, Jiaya},
  journal={arXiv preprint arXiv:2209.12400},
  year={2022}
}

@inproceedings{cui2021parametric,
  title={Parametric contrastive learning},
  author={Cui, Jiequan and Zhong, Zhisheng and Liu, Shu and Yu, Bei and Jia, Jiaya},
  booktitle={Proceedings of the IEEE/CVF international conference on computer vision},
  pages={715--724},
  year={2021}
}

@ARTICLE{9774921,
  author={Cui, Jiequan and Liu, Shu and Tian, Zhuotao and Zhong, Zhisheng and Jia, Jiaya},
  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
  title={ResLT: Residual Learning for Long-tailed Recognition}, 
  year={2022},
  volume={},
  number={},
  pages={1-1},
  doi={10.1109/TPAMI.2022.3174892}}
  
@article{cui2022region,
  title={Region Rebalance for Long-Tailed Semantic Segmentation},
  author={Cui, Jiequan and Yuan, Yuhui and Zhong, Zhisheng and Tian, Zhuotao and Hu, Han and Lin, Stephen and Jia, Jiaya},
  journal={arXiv preprint arXiv:2204.01969},
  year={2022}
  }