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Recommendation systems must optimize multiple objectives while satisfying hard business constraints such as fairness and coverage. For example, an e-commerce platform may require every recommendation list to include items from multiple…

Information Retrieval · Computer Science 2026-02-04 Guilin Zhang , Kai Zhao , Jeffrey Friedman , Xu Chu

Recent advances in Large Language Models (LLMs) have shifted in recommendation systems from the discriminative paradigm to the LLM-based generative paradigm, where the recommender autoregressively generates sequences of semantic identifiers…

Information Retrieval · Computer Science 2026-03-03 Jiawei Feng , Xiaoyu Kong , Leheng Sheng , Bin Wu , Chao Yi , Feifang Yang , Xiang-Rong Sheng , Han Zhu , Xiang Wang , Jiancan Wu , Xiangnan He

Multimodal recommender systems (MRS) integrate heterogeneous user and item data, such as text, images, and structured information, to enhance recommendation performance. The emergence of large language models (LLMs) introduces new…

Information Retrieval · Computer Science 2025-05-16 Alejo Lopez-Avila , Jinhua Du

Recent advancements in Multimodal Large Language Models (MLLMs) have demonstrated significant potential in recommendation systems. However, the effective application of MLLMs to multimodal sequential recommendation remains unexplored: A)…

Information Retrieval · Computer Science 2025-12-25 Haoyu Wang , Yitong Wang , Jining Wang

Recommender systems are essential for delivering personalized content across digital platforms by modeling user preferences and behaviors. Recently, large language models (LLMs) have been adopted for prompt-based recommendation due to their…

Information Retrieval · Computer Science 2025-05-28 Md Aminul Islam , Ahmed Sayeed Faruk

The long-tail recommendation is a challenging task for traditional recommender systems, due to data sparsity and data imbalance issues. The recent development of large language models (LLMs) has shown their abilities in complex reasoning,…

Information Retrieval · Computer Science 2024-03-12 Junda Wu , Cheng-Chun Chang , Tong Yu , Zhankui He , Jianing Wang , Yupeng Hou , Julian McAuley

The lack of training data gives rise to the system cold-start problem in recommendation systems, making them struggle to provide effective recommendations. To address this problem, Large Language Models (LLMs) can model recommendation tasks…

Information Retrieval · Computer Science 2024-12-25 Wenlin Zhang , Chuhan Wu , Xiangyang Li , Yuhao Wang , Kuicai Dong , Yichao Wang , Xinyi Dai , Xiangyu Zhao , Huifeng Guo , Ruiming Tang

Recommender systems (RS) are vital for managing information overload and delivering personalized content, responding to users' diverse information needs. The emergence of large language models (LLMs) offers a new horizon for redefining…

Information Retrieval · Computer Science 2024-07-16 Bo Chen , Xinyi Dai , Huifeng Guo , Wei Guo , Weiwen Liu , Yong Liu , Jiarui Qin , Ruiming Tang , Yichao Wang , Chuhan Wu , Yaxiong Wu , Hao Zhang

A recent Large language model (LLM)-based recommendation model, called RecRanker, has demonstrated a superior performance in the top-k recommendation task compared to other models. In particular, RecRanker samples users via clustering,…

Information Retrieval · Computer Science 2025-07-09 Zeyuan Meng , Zixuan Yi , Iadh Ounis

The rise of large language models (LLMs) has opened new opportunities in Recommender Systems (RSs) by enhancing user behavior modeling and content understanding. However, current approaches that integrate LLMs into RSs solely utilize either…

Information Retrieval · Computer Science 2024-03-26 Yunjia Xi , Weiwen Liu , Jianghao Lin , Chuhan Wu , Bo Chen , Ruiming Tang , Weinan Zhang , Yong Yu

Recommendation system plays an important role in online web applications. Sequential recommender further models user short-term preference through exploiting information from latest user-item interaction history. Most of the sequential…

Information Retrieval · Computer Science 2020-09-14 Ye Tao , Can Wang , Lina Yao , Weimin Li , Yonghong Yu

Recommendation systems aim to provide users with relevant suggestions, but often lack interpretability and fail to capture higher-level semantic relationships between user behaviors and profiles. In this paper, we propose a novel approach…

Information Retrieval · Computer Science 2024-01-26 Yan Wang , Zhixuan Chu , Xin Ouyang , Simeng Wang , Hongyan Hao , Yue Shen , Jinjie Gu , Siqiao Xue , James Y Zhang , Qing Cui , Longfei Li , Jun Zhou , Sheng Li

Recommender systems play an essential role in the choices people make in domains such as entertainment, shopping, food, news, employment, and education. The machine learning models underlying these recommender systems are often enormously…

Information Retrieval · Computer Science 2023-08-30 Sahil Verma , Ashudeep Singh , Varich Boonsanong , John P. Dickerson , Chirag Shah

Recommender systems (RS), serving at the forefront of Human-centered AI, are widely deployed in almost every corner of the web and facilitate the human decision-making process. However, despite their enormous capabilities and potential, RS…

Information Retrieval · Computer Science 2024-02-23 Yingqiang Ge , Shuchang Liu , Zuohui Fu , Juntao Tan , Zelong Li , Shuyuan Xu , Yunqi Li , Yikun Xian , Yongfeng Zhang

Recently, Large Language Model (LLM)-empowered recommender systems have revolutionized personalized recommendation frameworks and attracted extensive attention. Despite the remarkable success, existing LLM-empowered RecSys have been…

Information Retrieval · Computer Science 2025-04-04 Liangbo Ning , Wenqi Fan , Qing Li

Large language models (LLMs) have recently received significant attention for their exceptional capabilities. Despite extensive efforts in developing general-purpose LLMs that can be utilized in various natural language processing (NLP)…

Information Retrieval · Computer Science 2023-06-08 Fan Yang , Zheng Chen , Ziyan Jiang , Eunah Cho , Xiaojiang Huang , Yanbin Lu

Session-based recommendation (SR) models aim to recommend items to anonymous users based on their behavior during the current session. While various SR models in the literature utilize item sequences to predict the next item, they often…

Information Retrieval · Computer Science 2025-08-29 Jyoti Narwariya , Priyanka Gupta , Muskan Gupta , Jyotsana Khatri , Lovekesh Vig

Web applications where users are presented with a limited selection of items have long employed ranking models to put the most relevant results first. Any feedback received from users is typically assumed to reflect a relative judgement on…

Information Retrieval · Computer Science 2023-06-12 Maarten Buyl , Paul Missault , Pierre-Antoine Sondag

User interests on content platforms are inherently diverse, manifesting through complex behavioral patterns across heterogeneous scenarios such as search, feed browsing, and content discovery. Traditional recommendation systems typically…

Information Retrieval · Computer Science 2025-10-29 Manjie Xu , Cheng Chen , Xin Jia , Jingyi Zhou , Yongji Wu , Zejian Wang , Chi Zhang , Kai Zuo , Yibo Chen , Xu Tang , Yao Hu , Yixin Zhu

Large recommender models have extended LLMs as powerful recommenders via encoding or item generation, and recent breakthroughs in LLM reasoning synchronously motivate the exploration of reasoning in recommendation. In this work, we propose…

Information Retrieval · Computer Science 2025-11-03 Runyang You , Yongqi Li , Xinyu Lin , Xin Zhang , Wenjie Wang , Wenjie Li , Liqiang Nie