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:

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}
}

DenebUniverse/contrastive2021