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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

Large language models (LLMs) have attracted significant attention in recommendation systems. Current work primarily applies supervised fine-tuning (SFT) to adapt the model for recommendation tasks. However, SFT on positive examples only…

Information Retrieval · Computer Science 2025-02-07 Chongming Gao , Ruijun Chen , Shuai Yuan , Kexin Huang , Yuanqing Yu , Xiangnan He

Conversational recommender systems (CRS) based on Large Language Models (LLMs) need to constantly be aligned to the user preferences to provide satisfying and context-relevant item recommendations. The traditional supervised fine-tuning…

Machine Learning · Computer Science 2025-08-08 Zhongheng Yang , Aijia Sun , Yushang Zhao , Yinuo Yang , Dannier Li , Chengrui Zhou

Sequential Recommendation (SR) task involves predicting the next item a user is likely to interact with, given their past interactions. The SR models examine the sequence of a user's actions to discern more complex behavioral patterns and…

Information Retrieval · Computer Science 2025-04-22 Wujiang Xu , Qitian Wu , Zujie Liang , Jiaojiao Han , Xuying Ning , Yunxiao Shi , Wenfang Lin , Yongfeng Zhang

Large language models (LLMs) have demonstrated outstanding performance in natural language processing tasks. However, in the field of recommender systems, due to the inherent structural discrepancy between user behavior data and natural…

Information Retrieval · Computer Science 2026-01-01 Zekun Liu , Xiaowen Huang , Jitao Sang

The capabilities of Large Language Models (LLMs) are routinely evaluated by other LLMs trained to predict human preferences. This framework--known as LLM-as-a-judge--is highly scalable and relatively low cost. However, it is also vulnerable…

Computation and Language · Computer Science 2026-02-03 Lisa Alazraki , Tan Yi-Chern , Jon Ander Campos , Maximilian Mozes , Marek Rei , Max Bartolo

Large language models (LLMs) have recently demonstrated strong potential for sequential recommendation. However, current LLM-based approaches face critical limitations in modeling users' long-term and diverse interests. First, due to…

Information Retrieval · Computer Science 2025-10-30 Jingyi Zhou , Cheng Chen , Kai Zuo , Manjie Xu , Zhendong Fu , Yibo Chen , Xu Tang , Yao Hu

The sequential recommendation problem has attracted considerable research attention in the past few years, leading to the rise of numerous recommendation models. In this work, we explore how Large Language Models (LLMs), which are nowadays…

Information Retrieval · Computer Science 2025-01-14 Artun Boz , Wouter Zorgdrager , Zoe Kotti , Jesse Harte , Panos Louridas , Dietmar Jannach , Vassilios Karakoidas , Marios Fragkoulis

Large Language Models (LLMs) are being increasingly explored as general-purpose tools for recommendation tasks, enabling zero-shot and instruction-following capabilities without the need for task-specific training. While the research…

Information Retrieval · Computer Science 2025-08-05 Ethan Bito , Yongli Ren , Estrid He

The integration of Large Language Models (LLMs) into recommender systems has led to substantial performance improvements. However, this often comes at the cost of diminished recommendation diversity, which can negatively impact user…

Information Retrieval · Computer Science 2025-01-07 Jiaju Chen , Chongming Gao , Shuai Yuan , Shuchang Liu , Qingpeng Cai , Peng Jiang

The prevailing approach to aligning Large Language Models (LLMs) typically relies on human or AI feedback and assumes access to specific types of preference datasets. In our work, we question the efficacy of such datasets and explore…

Machine Learning · Computer Science 2024-03-19 Hao Sun

Large language models (LLMs) are reshaping the recommender system paradigm by enabling users to express preferences and receive recommendations through conversations. Yet, aligning LLMs to the recommendation task remains challenging:…

Information Retrieval · Computer Science 2026-02-17 Yaochen Zhu , Harald Steck , Dawen Liang , Yinhan He , Vito Ostuni , Jundong Li , Nathan Kallus

While astonishingly capable, large Language Models (LLM) can sometimes produce outputs that deviate from human expectations. Such deviations necessitate an alignment phase to prevent disseminating untruthful, toxic, or biased information.…

Artificial Intelligence · Computer Science 2024-10-30 Long Tan Le , Han Shu , Tung-Anh Nguyen , Choong Seon Hong , Nguyen H. Tran

As the focus on Large Language Models (LLMs) in the field of recommendation intensifies, the optimization of LLMs for recommendation purposes (referred to as LLM4Rec) assumes a crucial role in augmenting their effectiveness in providing…

Information Retrieval · Computer Science 2024-01-02 Keqin Bao , Jizhi Zhang , Wenjie Wang , Yang Zhang , Zhengyi Yang , Yancheng Luo , Chong Chen , Fuli Feng , Qi Tian

Recently, there has been a growing trend in utilizing large language models (LLMs) for recommender systems, referred to as LLMRec. A notable approach within this trend is not to fine-tune these models directly but instead to leverage…

Information Retrieval · Computer Science 2025-04-08 Yi Xu , Weicong Qin , Weijie Yu , Ming He , Jianping Fan , Jun Xu

Pre-trained large-scale language models (LLMs) excel at producing coherent articles, yet their outputs may be untruthful, toxic, or fail to align with user expectations. Current approaches focus on using reinforcement learning with human…

Computation and Language · Computer Science 2024-06-06 Dehong Xu , Liang Qiu , Minseok Kim , Faisal Ladhak , Jaeyoung Do

Interactive recommender systems can dynamically adapt to user feedback, but often suffer from content homogeneity and filter bubble effects due to overfitting short-term user preferences. While recent efforts aim to improve content…

Information Retrieval · Computer Science 2026-05-12 Chongjun Xia , Yanchun Peng , Xianzhi Wang

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

Large Language Models (LLMs) have recently garnered significant attention in various domains, including recommendation systems. Recent research leverages the capabilities of LLMs to improve the performance and user modeling aspects of…

Information Retrieval · Computer Science 2024-11-05 Lei Chen , Chen Gao , Xiaoyi Du , Hengliang Luo , Depeng Jin , Yong Li , Meng Wang

Leveraging Large Language Models as Recommenders (LLMRec) has gained significant attention and introduced fresh perspectives in user preference modeling. Existing LLMRec approaches prioritize text semantics, usually neglecting the valuable…

Information Retrieval · Computer Science 2025-06-17 Yang Zhang , Fuli Feng , Jizhi Zhang , Keqin Bao , Qifan Wang , Xiangnan He