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Adjusting Decision Boundary for Class Imbalanced Learning

This repository is the official PyTorch implementation of WVN-RS, introduced in Adjusting Decision Boundary for Class Imbalanced Learning.

Requirements

NVIDIA docker : Docker image will be pulled from cloud.
CIFAR dataset : The "dataset_path" in run_cifar.sh should be

cifar10/
    data_batch_N
    test_batch
cifar100/
    train
    test

CIFAR datasets are available here.

How to use

Run the shell script.

bash run_cifar.sh

To use Weight Vector Normalization (WVN), use --WVN flag. (It is already in the script.)

Results

Validation error on Long-Tailed CIFAR10

Imbalance	200	100	50	20	10	1
Baseline	35.67	29.71	22.91	16.04	13.26	6.83
Over-sample	32.19	28.27	21.40	15.23	12.24	6.61
Focal	34.71	29.62	23.28	16.77	13.19	6.60
CB	31.11	25.43	20.73	15.64	12.51	6.36
LDAM-DRW	28.09	22.97	17.83	14.53	11.84	6.32
Baseline+RS	27.02	21.36	17.16	13.46	11.86	6.32
WVN+RS	27.23	20.17	16.80	12.76	10.71	6.29

Validation error on Long-Tailed CIFAR100

Imbalance	200	100	50	20	10	1
Baseline	64.21	60.38	55.09	48.93	43.52	29.69
Over-sample	66.39	61.53	56.65	49.03	43.38	29.41
Focal	64.38	61.31	55.68	48.05	44.22	28.52
CB	63.77	60.40	54.68	47.41	42.01	28.39
LDAM-DRW	61.73	57.96	52.54	47.14	41.29	28.85
Baseline+RS	59.59	55.65	51.91	45.09	41.45	29.80
WVN+RS	59.48	55.50	51.80	46.12	41.02	29.22

Notes

This codes use docker image "feidfoe/pytorch:v.2" with pytorch version, '0.4.0a0+0640816'. The image only provides basic libraries such as NumPy or PIL.

WVN is implemented on ResNet architecture only.

Baseline repository

This repository is forked and modified from original repo.

Contact

Byungju Kim (byungju.kim@kaist.ac.kr)

BibTeX for Citation

@ARTICLE{9081988,
  author={B. {Kim} and J. {Kim}},
  journal={IEEE Access}, 
  title={Adjusting Decision Boundary for Class Imbalanced Learning}, 
  year={2020},
  volume={8},
  number={},
  pages={81674-81685},}