SelfReg: Self-supervised Contrastive Regularization for Domain Generalization

PyTorch official implementation of (Daehee Kim, Youngjun Yoo, Seunghyun Park, Jinkyu Kim, and Jaekoo Lee. "SelfReg: Self-supervised Contrastive Regularization for Domain Generalization." ICCV, 2021). - paper link

Citation

@inproceedings{kim2021selfreg,
  title={Selfreg: Self-supervised contrastive regularization for domain generalization},
  author={Kim, Daehee and Yoo, Youngjun and Park, Seunghyun and Kim, Jinkyu and Lee, Jaekoo},
  booktitle={Proceedings of the IEEE/CVF International Conference on Computer Vision},
  pages={9619--9628},
  year={2021}
}

Description

An overview of our proposed SelfReg. Here, we propose to use the self-supervised (in-batch) contrastive losses to regularize the model to learn domain-invariant representations. These losses regularize the model to map the representations of the "same-class" samples close together in the embedding space. We compute the following two dissimilarities in the embedding space: (i) individualized and (ii) heterogeneous self-supervised dissimilarity losses. We further use the stochastic weight average (SWA) technique and the inter-domain curriculum learning (IDCL) to optimize gradients in conflict directions.

Visualizations by t-SNE for (a) baseline (no DG techniques), (b) RSC, and (c) ours. For better understanding, we also provide sample images of house from all target domains. Note that we differently color-coded each points according to its class. (Data: PACS)

Computational Efficiency of IDCL (Inter-domain Curriculum Learning)

Backbone	Training Strategy	Training Time(s)
ResNet-18	Baseline (classic training strategy)	1556.8
ResNet-18	IDCL strategy	1283.5

We used one V100 GPU for model training. The training time in above table is the time it took to train all domains independently. The training time of the IDCL is 1283.5 seconds, equivalent to 82.4% of baseline on PACS.

Dependency

• python >= 3.6
• pytorch >= 1.7.0
• torchvision >= 0.8.1
• jupyter notebook
• gdown

How to Use

1. cd codes/ and sh download.sh to download PACS dataset.
2. Open train.ipynb and Run All.
3. Make sure that the training is running well in the last cell.
4. Check the results stored in path codes/resnet18/{save_name}/ when the training is completed.

Test trained SelfReg ResNet18 model

To test a ResNet18, you can download pretrained weights (SelfReg model) with this link.

These weights are wrapped torch.optim.swa_utils.AveragedModel() (SWA implementation of PyTorch).

Backbone	Target Domain	Acc %
ResNet-18	Photo	96.83
ResNet-18	Art Painting	83.15
ResNet-18	Cartoon	79.61
ResNet-18	Sketch	78.90

Benchmark of SelfReg in DomainBed