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Lifelong user behavior sequences are crucial for capturing user interests and predicting user responses in modern recommendation systems. A two-stage paradigm is typically adopted to handle these long sequences: a subset of relevant…

Information Retrieval · Computer Science 2025-03-27 Ningya Feng , Junwei Pan , Jialong Wu , Baixu Chen , Ximei Wang , Qian Li , Xian Hu , Jie Jiang , Mingsheng Long

Candidate retrieval is the first stage in recommendation systems, where a light-weight system is used to retrieve potentially relevant items for an input user. These candidate items are then ranked and pruned in later stages of recommender…

Information Retrieval · Computer Science 2023-08-08 Ahmed El-Kishky , Thomas Markovich , Kenny Leung , Frank Portman , Aria Haghighi , Ying Xiao

The sequential recommendation (SR) task aims to predict the next item based on users' historical interaction sequences. Typically trained on historical data, SR models often struggle to adapt to real-time preference shifts during inference…

Information Retrieval · Computer Science 2026-04-08 Xing Tang , Jingyang Bin , Ziqiang Cui , Xiaokun Zhang , Fuyuan Lyu , Jingyan Jiang , Dugang Liu , Chen Ma , Xiuqiang He

The increasing availability and diversity of multimodal data in recommender systems offer new avenues for enhancing recommendation accuracy and user satisfaction. However, these systems must contend with high-dimensional, sparse user-item…

Information Retrieval · Computer Science 2024-12-04 Yasser Khalafaoui , Martino Lovisetto , Basarab Matei , Nistor Grozavu

Learning dynamic user preference has become an increasingly important component for many online platforms (e.g., video-sharing sites, e-commerce systems) to make sequential recommendations. Previous works have made many efforts to model…

Information Retrieval · Computer Science 2022-09-21 Yuhao Yang , Chao Huang , Lianghao Xia , Yuxuan Liang , Yanwei Yu , Chenliang Li

Ranking is a core task in recommender systems, which aims at providing an ordered list of items to users. Typically, a ranking function is learned from the labeled dataset to optimize the global performance, which produces a ranking score…

Information Retrieval · Computer Science 2019-07-24 Changhua Pei , Yi Zhang , Yongfeng Zhang , Fei Sun , Xiao Lin , Hanxiao Sun , Jian Wu , Peng Jiang , Wenwu Ou

Currently, there starts a research trend to leverage neural architecture for recommendation systems. Though several deep recommender models are proposed, most methods are too simple to characterize users' complex preference. In this paper,…

Information Retrieval · Computer Science 2018-07-26 Han Xiao , Yidong Chen , Xiaodong Shi

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

Modern recommendation systems involve massive catalogs of multimodal items, where scalable item identification must balance compactness, semantic fidelity, and downstream effectiveness. Semantic IDs (SIDs) address this need by representing…

Information Retrieval · Computer Science 2026-04-28 Yongsen Pan , Yuxin Chen , Zheng Hu , Xu Yuan , Daoyuan Wang , Yuting Yin , Songhao Ni , Hongyang Wang , Jun Wang , Fuji Ren , Wenwu Ou

Context as the dynamic information describing the situation of items and users and affecting the users decision process is essential to be used by recommender systems in mobile commerce to guarantee the quality of recommendation. This paper…

Computers and Society · Computer Science 2009-08-10 Maryam Hosseini-Pozveh , Mohamadali Nematbakhsh , Naser Movahhedinia

Discovering user preferences across different domains is pivotal in cross-domain recommendation systems, particularly when platforms lack comprehensive user-item interactive data. The limited presence of shared users often hampers the…

Information Retrieval · Computer Science 2025-06-10 Zongyi Xiang , Yan Zhang , Lixin Duan , Hongzhi Yin , Ivor W. Tsang

Sequential recommender systems rank relevant items by modeling a user's interaction history and computing the inner product between the resulting user representation and stored item embeddings. To avoid the significant memory overhead of…

The interactions of users and items in recommender system could be naturally modeled as a user-item bipartite graph. In recent years, we have witnessed an emerging research effort in exploring user-item graph for collaborative filtering…

Machine Learning · Computer Science 2019-11-26 Xiao Wang , Ruijia Wang , Chuan Shi , Guojie Song , Qingyong Li

The amount of content on online music streaming platforms is immense, and most users only access a tiny fraction of this content. Recommender systems are the application of choice to open up the collection to these users. Collaborative…

Information Retrieval · Computer Science 2017-08-23 Cedric De Boom , Rohan Agrawal , Samantha Hansen , Esh Kumar , Romain Yon , Ching-Wei Chen , Thomas Demeester , Bart Dhoedt

This paper presents a novel value-aware approach to product recommendation that simultaneously addresses the high dimensionality and sparsity of user-item data while explicitly incorporating the contribution of each product and user to…

Information Retrieval · Computer Science 2026-05-01 María Florencia Acosta , Rodrigo García Arancibia , Pamela Llop , Mariel Lovatto , Lucas Mansilla

Fashion recommendation systems are highly desired by customers to find visually-collocated fashion items, such as clothes, shoes, bags, etc. While existing methods demonstrate promising results, they remain lacking in flexibility and…

Computer Vision and Pattern Recognition · Computer Science 2020-03-12 Xin Liu , Yongbin Sun , Ziwei Liu , Dahua Lin

Large-scale industrial recommendation systems typically employ a two-stage paradigm of retrieval and ranking to handle huge amounts of information. Recent research focuses on improving the performance of retrieval model. A promising way is…

Information Retrieval · Computer Science 2025-08-21 Chengcheng Guo , Junda She , Kuo Cai , Shiyao Wang , Qigen Hu , Qiang Luo , Kun Gai , Guorui Zhou

In this paper, by introducing a new user similarity index base on the diffusion process, we propose a modified collaborative filtering (MCF) algorithm, which has remarkably higher accuracy than the standard collaborative filtering. In the…

Data Analysis, Statistics and Probability · Physics 2015-05-13 Jian-Guo Liu , Tao Zhou , Zhao-Guo Xuan , Hong-An Che , Bing-Hong Wang , Yi-Cheng Zhang

Sequential recommendation plays an increasingly important role in many e-commerce services such as display advertisement and online shopping. With the rapid development of these services in the last two decades, users have accumulated a…

Information Retrieval · Computer Science 2021-06-01 Yongji Wu , Lu Yin , Defu Lian , Mingyang Yin , Neil Zhenqiang Gong , Jingren Zhou , Hongxia Yang

As Recommender Systems (RS) influence more and more people in their daily life, the issue of fairness in recommendation is becoming more and more important. Most of the prior approaches to fairness-aware recommendation have been situated in…

Information Retrieval · Computer Science 2021-01-12 Yingqiang Ge , Shuchang Liu , Ruoyuan Gao , Yikun Xian , Yunqi Li , Xiangyu Zhao , Changhua Pei , Fei Sun , Junfeng Ge , Wenwu Ou , Yongfeng Zhang