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Recommender systems are vital for shaping user online experiences. While some believe they may limit new content exploration and promote opinion polarization, a systematic analysis is still lacking. We present a model that explores the…

Physics and Society · Physics 2023-12-15 Giordano De Marzo , Pietro Gravino , Vittorio Loreto

With information systems becoming larger scale, recommendation systems are a topic of growing interest in machine learning research and industry. Even though progress on improving model design has been rapid in research, we argue that many…

Information Retrieval · Computer Science 2022-11-14 Tobias Schnabel , Mengting Wan , Longqi Yang

Sequential recommender systems have shown effective suggestions by capturing users' interest drift. There have been two groups of existing sequential models: user- and item-centric models. The user-centric models capture personalized…

Information Retrieval · Computer Science 2022-09-15 Dongmin Hyun , Chanyoung Park , Junsu Cho , Hwanjo Yu

Modeling user sequential behaviors has recently attracted increasing attention in the recommendation domain. Existing methods mostly assume coherent preference in the same sequence. However, user personalities are volatile and easily…

Information Retrieval · Computer Science 2022-04-01 Weiqi Shao , Xu Chen , Long Xia , Jiashu Zhao , Dawei Yin

Recommender systems trained in a continuous learning fashion are plagued by the feedback loop problem, also known as algorithmic bias. This causes a newly trained model to act greedily and favor items that have already been engaged by…

Machine Learning · Computer Science 2020-08-04 Dalin Guo , Sofia Ira Ktena , Ferenc Huszar , Pranay Kumar Myana , Wenzhe Shi , Alykhan Tejani

Novel data sources bring new opportunities to improve the quality of recommender systems and serve as a catalyst for the creation of new paradigms on personalized recommendations. Impressions are a novel data source containing the items…

Information Retrieval · Computer Science 2026-03-03 Fernando B. Pérez Maurera , Maurizio Ferrari Dacrema , Pablo Castells , Paolo Cremonesi

Traditional recommender systems present a relatively static list of recommendations to a user where the feedback is typically limited to an accept/reject or a rating model. However, these simple modes of feedback may only provide limited…

Information Retrieval · Computer Science 2019-04-17 Oznur Alkan , Elizabeth M. Daly , Adi Botea

Recommender systems have become crucial in information filtering nowadays. Existing recommender systems extract user preferences based on the correlation in data, such as behavioral correlation in collaborative filtering, feature-feature,…

Information Retrieval · Computer Science 2023-12-18 Chen Gao , Yu Zheng , Wenjie Wang , Fuli Feng , Xiangnan He , Yong Li

One of the main challenges in recommender systems is data sparsity which leads to high variance. Several attempts have been made to improve the bias-variance trade-off using auxiliary information. In particular, document modeling-based…

Information Retrieval · Computer Science 2021-09-14 Meysam Varasteh , Mehdi Soleiman Nejad , Hadi Moradi , Mohammad Amin Sadeghi , Ahmad Kalhor

Recommender systems are a vital tool that helps us to overcome the information overload problem. They are being used by most e-commerce web sites and attract the interest of a broad scientific community. A recommender system uses data on…

Information Retrieval · Computer Science 2017-02-22 Fei Yu , An Zeng , Sebastien Gillard , Matus Medo

Recommendation systems have traditionally relied on short-term engagement signals, such as clicks and likes, to personalize content. However, these signals are often noisy, sparse, and insufficient for capturing long-term user satisfaction…

Information Retrieval · Computer Science 2025-10-10 Saeideh Bakhshi , Phuong Mai Nguyen , Robert Schiller , Tiantian Xu , Pawan Kodandapani , Andrew Levine , Cayman Simpson , Qifan Wang

To address the problem of narrow recommendation ranges caused by an emphasis on prediction accuracy, serendipitous recommendations, which consider both usefulness and unexpectedness, have attracted attention. However, realizing…

Information Retrieval · Computer Science 2025-04-10 Zhelin Xu , Atsushi Matsumura

Recommender system is one of the most critical technologies for large internet companies such as Amazon and TikTok. Although millions of users use recommender systems globally everyday, and indeed, much data analysis work has been done to…

Information Retrieval · Computer Science 2025-05-29 Hao Wang

Traditional recommender systems (RecSys) primarily infer user preferences from implicit signals (such as clicks, watches, and purchases), often neglecting the rich explicit contextual feedback users provide through verbal text, like…

Most of the existing recommender systems use the ratings provided by users on individual items. An additional source of preference information is to use the ratings that users provide on sets of items. The advantages of using preferences on…

Information Retrieval · Computer Science 2019-04-30 Mohit Sharma , F. Maxwell Harper , George Karypis

Recommender systems have shown great potential to address information overload problem, namely to help users in finding interesting and relevant objects within a huge information space. Some physical dynamics, including heat conduction…

Data Analysis, Statistics and Probability · Physics 2011-07-04 Linyuan Lu , Weiping Liu

Recommender Systems have proliferated as general-purpose approaches to model a wide variety of consumer interaction data. Specific instances make use of signals ranging from user feedback, item relationships, geographic locality, social…

Information Retrieval · Computer Science 2018-08-31 Wang-Cheng Kang , Mengting Wan , Julian McAuley

Recommender systems have generated tremendous value for both users and businesses, drawing significant attention from academia and industry alike. However, due to practical constraints, academic research remains largely confined to offline…

Information Retrieval · Computer Science 2025-09-09 Kuan Zou , Aixin Sun

Improving the long-term user welfare (e.g., sustained user engagement) has become a central objective of recommender systems (RS). In real-world platforms, the creation behaviors of content creators plays a crucial role in shaping long-term…

Information Retrieval · Computer Science 2026-02-17 Xu Zhao , Xiaopeng Ye , Chen Xu , Weiran Shen , Jun Xu

Top-N recommendation, which aims to learn user ranking-based preference, has long been a fundamental problem in a wide range of applications. Traditional models usually motivate themselves by designing complex or tailored architectures…

Information Retrieval · Computer Science 2021-09-14 Mengyue Yang , Quanyu Dai , Zhenhua Dong , Xu Chen , Xiuqiang He , Jun Wang