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A PyTorch implementation of SimCLR based on ICML 2020 paper "A Simple Framework for Contrastive Learning of Visual Representations"

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SimCLR

A PyTorch implementation of SimCLR based on ICML 2020 paper A Simple Framework for Contrastive Learning of Visual Representations.

Network Architecture image from the paper

Requirements

conda install pytorch torchvision cudatoolkit=10.0 -c pytorch
  • thop
pip install thop

Dataset

CIFAR10 dataset is used in this repo, the dataset will be downloaded into data directory by PyTorch automatically.

Usage

Train SimCLR

python main.py --batch_size 1024 --epochs 1000 
optional arguments:
--feature_dim                 Feature dim for latent vector [default value is 128]
--temperature                 Temperature used in softmax [default value is 0.5]
--k                           Top k most similar images used to predict the label [default value is 200]
--batch_size                  Number of images in each mini-batch [default value is 512]
--epochs                      Number of sweeps over the dataset to train [default value is 500]

Linear Evaluation

python linear.py --batch_size 1024 --epochs 200 
optional arguments:
--model_path                  The pretrained model path [default value is 'results/128_0.5_200_512_500_model.pth']
--batch_size                  Number of images in each mini-batch [default value is 512]
--epochs                      Number of sweeps over the dataset to train [default value is 100]

Results

There are some difference between this implementation and official implementation, the model (ResNet50) is trained on one NVIDIA TESLA V100(32G) GPU:

  1. No Gaussian blur used;
  2. Adam optimizer with learning rate 1e-3 is used to replace LARS optimizer;
  3. No Linear learning rate scaling used;
  4. No Linear Warmup and CosineLR Schedule used.
Evaluation Protocol Params (M) FLOPs (G) Feature Dim Batch Size Epoch Num τ K Top1 Acc % Top5 Acc % Download
KNN 24.62 1.31 128 512 500 0.5 200 89.1 99.6 model | gc5k
Linear 23.52 1.30 - 512 100 - - 92.0 99.8 model | f7j2

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A PyTorch implementation of SimCLR based on ICML 2020 paper "A Simple Framework for Contrastive Learning of Visual Representations"

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