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An open-source framework for self-supervised recommender systems.

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SELFRec is a Python framework for self-supervised recommendation (SSR) which integrates commonly used datasets and metrics, and implements many state-of-the-art SSR models. SELFRec has a lightweight architecture and provides user-friendly interfaces. It can facilitate model implementation and evaluation.
Founder and principal contributor: @Coder-Yu @xiaxin1998
Supported by: @AIhongzhi (A/Prof. Hongzhi Yin, UQ)

This repo is released with our survey paper on self-supervised learning for recommender systems. We organized a tutorial on self-supervised recommendation at WWW'22. Visit the tutorial page for more information.

Architecture

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Features

  • Fast execution: SELFRec is developed with Python 3.7+, Tensorflow 1.14+ and Pytorch 1.7+. All models run on GPUs. Particularly, we optimize the time-consuming procedure of item ranking, drastically reducing the ranking time to seconds (less than 10 seconds for the scale of 10,000×50,000).
  • Easy configuration: SELFRec provides a set of simple and high-level interfaces, by which new SSR models can be easily added in a plug-and-play fashion.
  • Highly Modularized: SELFRec is divided into multiple discrete and independent modules/layers. This design decouples the model design from other procedures. For users of SELFRec, they just need to focus on the logic of their method, which streamlines the development.
  • SSR-Specific: SELFRec is designed for SSR. For the data augmentation and self-supervised tasks, it provides specific modules and interfaces for rapid development.

Requirements

numba==0.53.1
numpy==1.20.3
scipy==1.6.2
tensorflow==1.14.0
torch>=1.7.0

Usage

  1. Configure the xx.conf file in the directory named conf. (xx is the name of the model you want to run)
  2. Run main.py and choose the model you want to run.

Implemented Models

Model Paper Type Code
XSimGCL Yu et al. XSimGCL: Towards Extremely Simple Graph Contrastive Learning for Recommendation, Submitted to TKDE. Graph + CL PyTorch
SimGCL Yu et al. Are Graph Augmentations Necessary? Simple Graph Contrastive Learning for Recommendation, SIGIR'22. Graph + CL PyTorch
DirectAU Wang et al. Towards Representation Alignment and Uniformity in Collaborative Filtering, KDD'22. Graph PyTorch
NCL Lin et al. Improving Graph Collaborative Filtering with Neighborhood-enriched Contrastive Learning, WWW'22. Graph + CL PyTorch
MixGCF Huang et al. MixGCF: An Improved Training Method for Graph Neural Network-based Recommender Systems, KDD'21. Graph + DA PyTorch
MHCN Yu et al. Self-Supervised Multi-Channel Hypergraph Convolutional Network for Social Recommendation, WWW'21. Graph + CL TensorFlow
SGL Wu et al. Self-supervised Graph Learning for Recommendation, SIGIR'21. Graph + CL TensorFlow & Torch
SEPT Yu et al. Socially-Aware Self-supervised Tri-Training for Recommendation, KDD'21. Graph + CL TensorFlow
BUIR Lee et al. Bootstrapping User and Item Representations for One-Class Collaborative Filtering, SIGIR'21. Graph + DA PyTorch
SSL4Rec Yao et al. Self-supervised Learning for Large-scale Item Recommendations, CIKM'21. Graph + CL PyTorch
SelfCF Zhou et al. SelfCF: A Simple Framework for Self-supervised Collaborative Filtering, arXiv'21. Graph + DA PyTorch
LightGCN He et al. LightGCN: Simplifying and Powering Graph Convolution Network for Recommendation, SIGIR'20. Graph PyTorch
MF Yehuda et al. Matrix Factorization Techniques for Recommender Systems, IEEE Computer'09. Graph PyTorch
* CL is short for contrastive learning (including data augmentation); DA is short for data augmentation only

Leaderboard

The results are obtained on the dataset of Yelp2018. We performed grid search for the best hyperparameters.
General hyperparameter settings are: batch_size: 2048, emb_size: 64, learning rate: 0.001, L2 reg: 0.0001.

Model Recall@20 NDCG@20 Hyperparameter settings
MF 0.0543 0.0445
LightGCN 0.0639 0.0525 layer=3
NCL 0.0670 0.0562 layer=3, ssl_reg=1e-6, proto_reg=1e-7, tau=0.05, hyper_layers=1, alpha=1.5, num_clusters=2000
SGL 0.0675 0.0555 λ=0.1, ρ=0.1, tau=0.2 layer=3
MixGCF 0.0691 0.0577 layer=3, n_nes=64, layer=3
DirectAU 0.0695 0.0583 𝛾=2, layer=3
SimGCL 0.0721 0.0601 λ=0.5, eps=0.1, tau=0.2, layer=3
XSimGCL 0.0723 0.0604 λ=0.2, eps=0.2, l∗=1 tau=0.15 layer=3

Implement Your Model

  1. Create a .conf file for your model in the directory named conf.
  2. Make your model inherit the proper base class.
  3. Reimplement the following functions.
    • build(), train(), save(), predict()
  4. Register your model in main.py.

Related Datasets

   
Data Set Basic Meta User Context
Users ItemsRatings (Scale) Density Users Links (Type)
Douban 2,848 39,586 894,887 [1, 5] 0.794% 2,848 35,770 Trust
LastFM 1,892 17,632 92,834 implicit 0.27% 1,892 25,434 Trust
Yelp 19,539 21,266 450,884 implicit 0.11% 19,539 864,157 Trust
Amazon-Book 52,463 91,599 2,984,108 implicit 0.11% - - -

Reference

If you find this repo helpful to your research, please cite our paper.

@article{yu2022self,
  title={Self-Supervised Learning for Recommender Systems: A Survey},
  author={Yu, Junliang and Yin, Hongzhi and Xia, Xin and Chen, Tong and Li, Jundong and Huang, Zi},
  journal={arXiv preprint arXiv:2203.15876},
  year={2022}
}

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An open-source framework for self-supervised recommender systems.

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