Contrastive Self-Supervised Learning on CIFAR-10

Description

Weiran Huang, Mingyang Yi and Xuyang Zhao, "Towards the Generalization of Contrastive Self-Supervised Learning", arXiv:2111.00743, 2021.

This repository is used to verify how data augmentations will affect the performance of contrastive self-supervised learning algorithms.

Supported Models

• SimCLR
• Barlow Twins
• MoCo
• SimSiam

Supported Augmentations

• (a) Random Cropping
• (b) Random Gaussian Blur
• (c) Color Dropping (i.e., randomly convert images to grayscale)
• (d) Color Distortion
• (e) Random Horizontal Flipping

Installation

python -m venv venv                 # create a virtual environment named venv
source venv/bin/activate            # activate the environment
pip install -r requirements.txt     # install the dependencies

Code is tested in the following environment:

• torch==1.4.0
• torchvision==0.5.0
• torchmetrics==0.4.0
• pytorch-lightning==1.3.8
• hydra-core==1.0.0
• lightly==1.0.8 (important!)

Script and Sample Code

├── contrastive2021
    ├── README.md                  // descriptions about the repo
    ├── requirements.txt           // dependencies
    ├── scripts
        ├── run_train_eval.sh      // shell script for training and evaluation
    ├── src
        ├── models.py              // models
        ├── util.py                // utilities
    ├── train_eval.py              // training and evaluation script

Evaluation

KNN evaluation protocol. Code from here.

Results

Richer data augmentations result in better performance

Usage: python train_eval.py --model=simclr --epoch=800 --augs=abcde --num_runs=3

(a)	(b)	(c)	(d)	(e)	SimCLR	Barlow Twins	MoCo	SimSiam
✓	✓	✓	✓	✓	89.76 ± 0.12	86.91 ± 0.09	90.12 ± 0.12	90.59 ± 0.11
✓	✓	✓	✓	×	88.48 ± 0.22	85.38 ± 0.37	89.69 ± 0.11	89.34 ± 0.09
✓	✓	✓	×	×	83.50 ± 0.14	82.00 ± 0.59	86.78 ± 0.07	85.38 ± 0.09
✓	✓	×	×	×	63.23 ± 0.05	67.83 ± 0.94	75.12 ± 0.28	63.27 ± 0.30
✓	×	×	×	×	62.74 ± 0.18	67.77 ± 0.69	74.94 ± 0.22	61.47 ± 0.74

Stronger data augmentations result in better performance

Usage: python train_eval.py --model=twins --epoch=800 --augs=color --color_strength=0.5 --num_runs=3

Color Distortion Strength	SimCLR	Barlow Twins	MoCo	SimSiam
1	82.75 ± 0.24	82.58 ± 0.25	86.68 ± 0.05	82.50 ± 1.05
1/2	78.76 ± 0.18	81.88 ± 0.25	84.30 ± 0.14	81.80 ± 0.15
1/4	76.37 ± 0.11	79.64 ± 0.34	82.76 ± 0.09	78.80 ± 0.17
1/8	74.23 ± 0.16	77.96 ± 0.16	81.20 ± 0.12	76.09 ± 0.50

Acknowledgement

This code is based on:

• IgorSusmelj/barlowtwins
• lightly/imagenette_benchmark.py

Citation

If you find our work useful in your research, please consider citing:

@misc{huang2021towards,
      title={Towards the Generalization of Contrastive Self-Supervised Learning}, 
      author={Weiran Huang and Mingyang Yi and Xuyang Zhao},
      year={2021},
      eprint={2111.00743},
      archivePrefix={arXiv}
}