Self-Supervised Learning for Alleviating Popularity Bias in Recommender Systems

ZHANG Shuai; GAO Min; WEN Jun-hao; XIONG Qing-yu; TANG Xu

doi:10.12263/DZXB.20210443

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Self-Supervised Learning for Alleviating Popularity Bias in Recommender Systems

PAPERS | 更新时间：2025-12-08

- Self-Supervised Learning for Alleviating Popularity Bias in Recommender Systems
- ACTA ELECTRONICA SINICA Vol. 50, Issue 10, Pages: 2361-2371(2022)
- 作者机构：
  
  1.信息物理社会可信服务计算教育部重点实验室（重庆大学），重庆 400044
  2.重庆大学大数据与软件学院，重庆 400044
- 作者简介：
- 基金信息：
- DOI：10.12263/DZXB.20210443
  CLC： TP311;
- Received：07 April 2021，
  
  Revised：2021-09-02，
  
  Published：25 October 2022
- 稿件说明：
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张帅,高旻,文俊浩等.基于自监督学习的去流行度偏差推荐方法[J].电子学报,2022,50(10):2361-2371.

ZHANG Shuai,GAO Min,WEN Jun-hao,et al.Self-Supervised Learning for Alleviating Popularity Bias in Recommender Systems[J].ACTA ELECTRONICA SINICA,2022,50(10):2361-2371.
张帅,高旻,文俊浩等.基于自监督学习的去流行度偏差推荐方法[J].电子学报,2022,50(10):2361-2371. DOI： 10.12263/DZXB.20210443.

ZHANG Shuai,GAO Min,WEN Jun-hao,et al.Self-Supervised Learning for Alleviating Popularity Bias in Recommender Systems[J].ACTA ELECTRONICA SINICA,2022,50(10):2361-2371. DOI： 10.12263/DZXB.20210443.

摘要

近年来，随着推荐系统研究的不断深入，推荐系统的公平性受到越来越多关注. 流行度偏差也即流行的物品比非流行的物品更容易被推荐，是影响其公平性的重要因素之一. 流行度偏差对推荐系统的各利益相关者都有严重的影响，引起研究者的广泛关注. 相关研究主要通过推荐结果重排或学习过程中融合正则化项提升非流行物品的曝光率，而非流行物品的交互数据极度稀疏成为研究的瓶颈. 针对此问题，本文提出基于自监督学习的去流行度偏差推荐方法，解决两个难点：（1）准确学习交互数据极度稀疏的非流行物品的表征；（2）提升非流行物品曝光率的同时，兼顾不同用户对流行和非流行物品的偏好. 具体地，从用户的角度，提出流行物品和非流行物品双视图的用户偏好学习方法，准确学习用户对流行和非流行物品的真实偏好；从物品的角度，采用自监督学习，利用互信息最大化捕获非流行物品与流行物品间的潜在关系，辅助提升非流行物品嵌入学习的准确性. 最后，设计用户流行度偏好一致性、资格公平性等指标，并通过三个公开数据集的大量实验说明了本文方法在提升推荐性能的同时，能有效缓解流行度偏差问题并具有较强的通用性.

Abstract

In recent years

with the development of recommender system

more and more attention has been paid to the fairness of recommender system. Popularity bias mens that popular items are more likely to be recommended than unpopular items

which is one of the important factors affecting its fairness. Popularity bias has a serious impact on all stakeholders in the recommendation system

which has aroused widespread concern of researchers. Related research mainly improves the exposure rate of unpopular items by the rearrangement of recommended results or the integration of regularization items in the learning process

but the extremely sparse interaction data of unpopular items becomes the bottleneck of research. To solve this problem

this paper proposes self-supervised learning for alleviating popularity bias (SSLAB) to deal with two difficulties: (1) accurately learning the representation of unpopular items with extremely sparse interactive data; (2) improving the exposure rate of unpopular items while taking into account the preferences of different users for popular and unpopular items. Specifically

from the perspective of users

this paper proposes a dual view user preference learning method for popular and unpopular items to accurately learn users’ real preferences for popular and unpopular items; from the perspective of items

self-supervised learning is used to capture the potential relationship between unpopular items and popular items by maximizing mutual information to help improve the accuracy of unpopular items embedded learning. Finally

metrics such as user popularity preference consistency and qualification fairness are designed

and a large number of experiments on three open data sets show that the proposed method can effectively alleviate the popularity bias and has a strong scalability while improving the recommendation performance.

关键词

Keywords

references

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