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Rainbow Memory: Continual Learning with a Memory of Diverse Samples
Jihwan Bang^*, Heesu Kim^*, YoungJoon Yoo, Jung-Woo Ha, Jonghyun Choi
CVPR 2021
Paper | Supp | Slide | Video | Bibtex
(* indicates equal contribution)

Continual learning is a realistic learning scenario for AI models. Prevalent scenario of continual learning, however, assumes disjoint sets of classes as tasks and is less realistic rather artificial. Instead, we focus on 'blurry' task boundary; where tasks shares classes and is more realistic and practical. To address such task, we argue the importance of diversity of samples in an episodic memory. To enhance the sample diversity in the memory, we propose a novel memory management strategy based on per-sample classification uncertainty and data augmentation, named Rainbow Memory (RM). With extensive empirical validations on MNIST, CIFAR10, CIFAR100, and ImageNet datasets, we show that the proposed method significantly improves the accuracy in blurry continual learning setups, outperforming state of the arts by large margins despite its simplicity.

The table is shown for last accuracy comparison in various datasets in Blurry10-Online. If you want to see more details, see the paper.

• April 2nd, 2021: Initial upload only README
• April 16th, 2021: Upload all the codes for experiments
• Jan 18th, 2022: Upload the notebooks to make blurry or disjoint dataset

• Python3
• Pytorch (>1.0)
• torchvision (>0.2)
• numpy
• pillow~=6.2.1
• torch_optimizer
• randaugment
• easydict
• pandas~=1.1.3

All the datasets are saved in dataset directory by following formats as shown below.

[dataset name] 
    |_train
        |_[class1 name]
            |_00001.png
            |_00002.png 
            ...
        |_[class2 name]
            ... 
    |_test (val for ImageNet)
        |_[class1 name]
            |_00001.png
            |_00002.png
            ...
        |_[class2 name]
            ...

You can easily download the dataset following above format.

• MNIST: https://github.com/hwany-j/mnist_png
• CIFAR-10: https://github.com/hwany-j/cifar10_png
• CIFAR-100: https://github.com/hwany-j/cifar100_png

For ImageNet, you should download the public site.

• train: http://www.image-net.org/challenges/LSVRC/2012/nnoupb/ILSVRC2012_img_train.tar
• validation: http://www.image-net.org/challenges/LSVRC/2012/nnoupb/ILSVRC2012_img_val.tar

If you have custom datasets, you can make disjoint or blurry datasets of each task using make_dataset_per_task.ipynb.

To run the experiments in the paper, you just run experiment.sh.

bash experiment.sh 

For various experiments, you should know the role of each argument.

• MODE: CIL methods. Our method is called rm. [joint, gdumb, icarl, rm, ewc, rwalk, bic] (joint calculates accuracy when training all the datasets at once.)
• MEM_MANAGE: Memory management method. default uses the memory method which the paper originally used. [default, random, reservoir, uncertainty, prototype].
• RND_SEED: Random Seed Number
• DATASET: Dataset name [mnist, cifar10, cifar100, imagenet]
• STREAM: The setting whether current task data can be seen iteratively or not. [online, offline]
• EXP: Task setup [disjoint, blurry10, blurry30]
• MEM_SIZE: Memory size cifar10: k={200, 500, 1000}, mnist: k=500, cifar100: k=2,000, imagenet: k=20,000
• TRANS: Augmentation. Multiple choices [cutmix, cutout, randaug, autoaug]

There are three types of logs during running experiments; logs, results, tensorboard. The log files are saved in logs directory, and the results which contains accuracy of each task are saved in results directory.

root_directory
    |_ logs 
        |_ [dataset]
            |_{mode}_{mem_manage}_{stream}_msz{k}_rnd{seed_num}_{trans}.log
            |_ ...
    |_ results
        |_ [dataset]
            |_{mode}_{mem_manage}_{stream}_msz{k}_rnd{seed_num}_{trans}.npy
            |_...

In addition, you can also use the tensorboard as following command.

tensorboard --logdir tensorboard

@InProceedings{Bang_2021_CVPR,
    author    = {Bang, Jihwan and Kim, Heesu and Yoo, YoungJoon and Ha, Jung-Woo and Choi, Jonghyun},
    title     = {Rainbow Memory: Continual Learning With a Memory of Diverse Samples},
    booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
    month     = {June},
    year      = {2021},
    pages     = {8218-8227}
}

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