MiSLAS

Improving Calibration for Long-Tailed Recognition

Authors: Zhisheng Zhong, Jiequan Cui, Shu Liu, Jiaya Jia

[arXiv] [slide] [BibTeX]

Introduction: This repository provides an implementation for the CVPR 2021 paper: "Improving Calibration for Long-Tailed Recognition" based on LDAM-DRW and Decoupling models. Our study shows, because of the extreme imbalanced composition ratio of each class, networks trained on long-tailed datasets are more miscalibrated and over-confident. MiSLAS is a simple, and efficient two-stage framework for long-tailed recognition, which greatly improves recognition accuracy and markedly relieves over-confidence simultaneously.

Installation

Requirements

• Python 3.7
• torchvision 0.4.0
• Pytorch 1.2.0
• yacs 0.1.8

Virtual Environment

conda create -n MiSLAS python==3.7
source activate MiSLAS

Install MiSLAS

git clone https://github.com/Jia-Research-Lab/MiSLAS.git
cd MiSLAS
pip install -r requirements.txt

Dataset Preparation

• CIFAR-10 & CIFAR-100
• ImageNet
• iNaturalist 2018
• Places

Change the data_path in config/*/*.yaml accordingly.

Training

Stage-1:

To train a model for Stage-1 with mixup, run:

(one GPU for CIFAR-10-LT & CIFAR-100-LT, four GPUs for ImageNet-LT, iNaturalist 2018, and Places-LT)

python train_stage1.py --cfg ./config/DATASETNAME/DATASETNAME_ARCH_stage1_mixup.yaml

DATASETNAME can be selected from cifar10, cifar100, imagenet, ina2018, and places.

ARCH can be resnet32 for cifar10/100, resnet50/101/152 for imagenet, resnet50 for ina2018, and resnet152 for places, respectively.

Stage-2:

To train a model for Stage-2 with one GPU (all the above datasets), run:

python train_stage2.py --cfg ./config/DATASETNAME/DATASETNAME_ARCH_stage2_mislas.yaml resume /path/to/checkpoint/stage1

The saved folder (including logs and checkpoints) is organized as follows.

MiSLAS
├── saved
│   ├── modelname_date
│   │   ├── ckps
│   │   │   ├── current.pth.tar
│   │   │   └── model_best.pth.tar
│   │   └── logs
│   │       └── modelname.txt
│   ...   

Evaluation

To evaluate a trained model, run:

python eval.py --cfg ./config/DATASETNAME/DATASETNAME_ARCH_stage1_mixup.yaml  resume /path/to/checkpoint/stage1
python eval.py --cfg ./config/DATASETNAME/DATASETNAME_ARCH_stage2_mislas.yaml resume /path/to/checkpoint/stage2

Results and Models

1) CIFAR-10-LT and CIFAR-100-LT

• Stage-1 (mixup):

Dataset	Top-1 Accuracy	ECE (15 bins)	Model
CIFAR-10-LT IF=10	87.6%	11.9%	link
CIFAR-10-LT IF=50	78.1%	2.49%	link
CIFAR-10-LT IF=100	72.8%	2.14%	link
CIFAR-100-LT IF=10	59.1%	5.24%	link
CIFAR-100-LT IF=50	45.4%	4.33%	link
CIFAR-100-LT IF=100	39.5%	8.82%	link

• Stage-2 (MiSLAS):

Dataset	Top-1 Accuracy	ECE (15 bins)	Model
CIFAR-10-LT IF=10	90.0%	1.20%	link
CIFAR-10-LT IF=50	85.7%	2.01%	link
CIFAR-10-LT IF=100	82.5%	3.66%	link
CIFAR-100-LT IF=10	63.2%	1.73%	link
CIFAR-100-LT IF=50	52.3%	2.47%	link
CIFAR-100-LT IF=100	47.0%	4.83%	link

Note: To obtain better performance, we highly recommend changing the weight decay 2e-4 to 5e-4 on CIFAR-LT.

2) Large-scale Datasets

• Stage-1 (mixup):

Dataset	Arch	Top-1 Accuracy	ECE (15 bins)	Model
ImageNet-LT	ResNet-50	45.5%	7.98%	link
iNa'2018	ResNet-50	66.9%	5.37%	link
Places-LT	ResNet-152	29.4%	16.7%	link

• Stage-2 (MiSLAS):

Dataset	Arch	Top-1 Accuracy	ECE (15 bins)	Model
ImageNet-LT	ResNet-50	52.7%	1.78%	link
iNa'2018	ResNet-50	71.6%	7.67%	link
Places-LT	ResNet-152	40.4%	3.41%	link

Citation

Please consider citing MiSLAS in your publications if it helps your research. :)

@inproceedings{zhong2021mislas,
    title={Improving Calibration for Long-Tailed Recognition},
    author={Zhisheng Zhong, Jiequan Cui, Shu Liu, and Jiaya Jia},
    booktitle={IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
    year={2021},
}

Contact

If you have any questions about our work, feel free to contact us through email (Zhisheng Zhong: [email protected]) or Github issues.