Official Pytorch implementation of CutMix regularizer | Paper | Pretrained Models
Sangdoo Yun, Dongyoon Han, Seong Joon Oh, Sanghyuk Chun, Junsuk Choe, Youngjoon Yoo.
Clova AI Research, NAVER Corp.
Our implementation is based on these repositories:
Regional dropout strategies have been proposed to enhance the performance of convolutional neural network classifiers. They have proved to be effective for guiding the model to attend on less discriminative parts of objects (e.g. leg as opposed to head of a person), thereby letting the network generalize better and have better object localization capabilities. On the other hand, current methods for regional dropout removes informative pixels on training images by overlaying a patch of either black pixels or random noise. Such removal is not desirable because it leads to information loss and inefficiency during training. We therefore propose the CutMix augmentation strategy: patches are cut and pasted among training images where the ground truth labels are also mixed proportionally to the area of the patches. By making efficient use of training pixels and retaining the regularization effect of regional dropout, CutMix consistently outperforms the state-of-the-art augmentation strategies on CIFAR and ImageNet classification tasks, as well as on the ImageNet weakly-supervised localization task. Moreover, unlike previous augmentation methods, our CutMix-trained ImageNet classifier, when used as a pretrained model, results in consistent performance gains in Pascal detection and MS-COCO image captioning benchmarks. We also show that CutMix improves the model robustness against input corruptions and its out-of-distribution detection performances.
23 May, 2019: Initial upload
- Python3
- PyTorch (> 1.0)
- torchvision (> 0.2)
- NumPy
- CIFAR-100: We used 2 GPUs to train CIFAR-100.
python train.py \
--net_type pyramidnet \
--dataset cifar100 \
--depth 200 \
--alpha 240 \
--batch_size 64 \
--lr 0.25 \
--expname PyraNet200 \
--epochs 300 \
--beta 1.0 \
--cutmix_prob 0.5 \
--no-verbose
- ImageNet: We used 4 GPUs to train ImageNet.
python train.py \
--net_type resnet \
--dataset imagenet \
--batch_size 256 \
--lr 0.1 \
--depth 50 \
--epochs 300 \
--expname ResNet50 \
-j 40 \
--beta 1.0 \
--cutmix_prob 1.0 \
--no-verbose
python test.py \
--net_type pyramidnet \
--dataset cifar100 \
--batch_size 64 \
--depth 200 \
--alpha 240 \
--pretrained /set/your/model/path/model_best.pth.tar
python test.py \
--net_type resnet \
--dataset imagenet \
--batch_size 64 \
--depth 50 \
--pretrained /set/your/model/path/model_best.pth.tar
- PyramidNet-200 pretrained on CIFAR-100 dataset:
| Method | Top-1 Error | Model file |
|---|---|---|
| PyramidNet-200 [CVPR'17] (baseline) | 16.45 | model |
| PyramidNet-200 + CutMix | 14.23 | model |
| PyramidNet-200 + Shakedrop [arXiv'18] + CutMix | 13.81 | - |
| PyramidNet-200 + Mixup [ICLR'18] | 15.63 | model |
| PyramidNet-200 + Manifold Mixup [ICML'19] | 16.14 | model |
| PyramidNet-200 + Cutout [arXiv'17] | 16.53 | model |
| PyramidNet-200 + DropBlock [NeurIPS'18] | 15.73 | model |
| PyramidNet-200 + Cutout + Labelsmoothing | 15.61 | model |
| PyramidNet-200 + DropBlock + Labelsmoothing | 15.16 | model |
| PyramidNet-200 + Cutout + Mixup | 15.46 | model |
- ResNet models pretrained on ImageNet dataset:
| Method | Top-1 Error | Model file |
|---|---|---|
| ResNet-50 [CVPR'16] (baseline) | 23.68 | model |
| ResNet-50 + CutMix | 21.40 | model |
| ResNet-50 + Feature CutMix | 21.80 | model |
| ResNet-50 + Mixup [ICLR'18] | 22.58 | model |
| ResNet-50 + Manifold Mixup [ICML'19] | 22.50 | model |
| ResNet-50 + Cutout [arXiv'17] | 22.93 | model |
| ResNet-50 + AutoAugment [CVPR'19] | 22.40* | - |
| ResNet-50 + DropBlock [NeurIPS'18] | 21.87* | - |
| ResNet-101 + CutMix | 20.17 | model |
| ResNet-152 + CutMix | 19.20 | model |
| ResNeXt-101 (32x4d) + CutMix | 19.47 | model |
* denotes results reported in the original papers
| Backbone | ImageNet Cls (%) | ImageNet Loc (%) | CUB200 Loc (%) | Detection (SSD) (mAP) | Detection (Faster-RCNN) (mAP) | Image Captioning (BLEU-4) |
|---|---|---|---|---|---|---|
| ResNet50 | 23.68 | 46.3 | 49.41 | 76.7 | 75.6 | 22.9 |
| ResNet50+Mixup | 22.58 | 45.84 | 49.3 | 76.6 | 73.9 | 23.2 |
| ResNet50+Cutout | 22.93 | 46.69 | 52.78 | 76.8 | 75 | 24.0 |
| ResNet50+CutMix | 21.60 | 46.25 | 54.81 | 77.6 | 76.7 | 24.9 |
- Pytorch-CutMix by @hysts
- TensorFlow-CutMix by @jis478
@inproceedings{yun2019cutmix,
title={CutMix: Regularization Strategy to Train Strong Classifiers with Localizable Features},
author={Yun, Sangdoo and Han, Dongyoon and Oh, Seong Joon and Chun, Sanghyuk and Choe, Junsuk and Yoo, Youngjoon},
booktitle = {International Conference on Computer Vision (ICCV)},
year={2019},
pubstate={published},
tppubtype={inproceedings}
}
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