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In Conversational Recommendation Systems (CRS), a user provides feedback on recommended items at each turn, leading the CRS towards improved recommendations. Due to the need for a large amount of data, a user simulator is employed for both…

Information Retrieval · Computer Science 2025-07-25 Maria Vlachou

Conversational Recommender System (CRS) leverages real-time feedback from users to dynamically model their preferences, thereby enhancing the system's ability to provide personalized recommendations and improving the overall user…

Human-Computer Interaction · Computer Science 2024-05-15 Lixi Zhu , Xiaowen Huang , Jitao Sang

An ultimate goal of recommender systems (RS) is to improve user engagement. Reinforcement learning (RL) is a promising paradigm for this goal, as it directly optimizes overall performance of sequential recommendation. However, many existing…

Information Retrieval · Computer Science 2023-04-06 Guoxi Zhang , Xing Yao , Xuanji Xiao

Traditional sparse and dense retrieval methods struggle to leverage general world knowledge and often fail to capture the nuanced features of queries and products. With the advent of large language models (LLMs), industrial search systems…

Information Retrieval · Computer Science 2025-07-14 Ming Pang , Chunyuan Yuan , Xiaoyu He , Zheng Fang , Donghao Xie , Fanyi Qu , Xue Jiang , Changping Peng , Zhangang Lin , Ching Law , Jingping Shao

In recommendation systems, the matching stage is becoming increasingly critical, serving as the upper limit for the entire recommendation process. Recently, some studies have started to explore the use of multi-scenario information for…

Information Retrieval · Computer Science 2024-08-07 Yingcai Ma , Ziyang Wang , Yuliang Yan , Jian Wu , Yuning Jiang , Longbin Li , Wen Chen , Jianhang Huang

For ambiguous queries, conventional retrieval systems are bound by two conflicting goals. On the one hand, they should diversify and strive to present results for as many query intents as possible. On the other hand, they should provide…

Information Retrieval · Computer Science 2015-03-19 Karthik Raman , Thorsten Joachims , Pannaga Shivaswamy

Contemporary recommendation systems are designed to meet users' needs by delivering tailored lists of items that align with their specific demands or interests. In a multi-stage recommendation system, reranking plays a crucial role by…

Information Retrieval · Computer Science 2025-03-26 Yuxin Ren , Qiya Yang , Yichun Wu , Wei Xu , Yalong Wang , Zhiqiang Zhang

Recommender systems can be formulated as a matrix completion problem, predicting ratings from user and item parameter vectors. Optimizing these parameters by subsampling data becomes difficult as the number of users and items grows. We…

Information Retrieval · Computer Science 2018-07-09 Elias Tragas , Calvin Luo , Maxime Gazeau , Kevin Luk , David Duvenaud

Click-Through Rate (CTR) prediction models are integral to a myriad of industrial settings, such as personalized search advertising. Current methods typically involve feature extraction from users' historical behavior sequences combined…

Machine Learning · Computer Science 2025-07-16 Lingwei Kong , Lu Wang , Changping Peng , Zhangang Lin , Ching Law , Jingping Shao

Recommendation systems (RSs) are increasingly used to guide job seekers on online platforms, yet the algorithms currently deployed are typically optimized for predictive objectives such as clicks, applications, or hires, rather than job…

Recommender systems can be characterized as software solutions that provide users convenient access to relevant content. Traditionally, recommender systems research predominantly focuses on developing machine learning algorithms that aim to…

Information Retrieval · Computer Science 2022-10-20 Dietmar Jannach

Repeated Sampling (RS) is a simple inference-time algorithm that has been shown to improve model performance on complex tasks. Although it is an effective way of scaling inference time, it often struggles to generate diverse solution…

Artificial Intelligence · Computer Science 2026-02-17 Divij Handa , Mihir Parmar , Aswin RRV , Md Nayem Uddin , Hamid Palangi , Chitta Baral

We consider an online model for recommendation systems, with each user being recommended an item at each time-step and providing 'like' or 'dislike' feedback. Each user may be recommended a given item at most once. A latent variable model…

Machine Learning · Statistics 2019-05-08 Guy Bresler , Mina Karzand

Conversational Recommender Systems (CRS) has become an emerging research topic seeking to perform recommendations through interactive conversations, which generally consist of generation and recommendation modules. Prior work on CRS tends…

Computation and Language · Computer Science 2022-09-26 Lingzhi Wang , Shafiq Joty , Wei Gao , Xingshan Zeng , Kam-Fai Wong

Ranking is a crucial module using in the recommender system. In particular, the ranking module using in our YoungTao recommendation scenario is to provide an ordered list of items to users, to maximize the click number throughout the…

Information Retrieval · Computer Science 2023-08-29 Shaowei Liu , Yangjun Liu

Sequential Recommender Systems (SRSs) are a popular type of recommender system that learns from a user's history to predict the next item they are likely to interact with. However, user interactions can be affected by noise stemming from…

Information Retrieval · Computer Science 2024-04-18 Andrea Bacciu , Federico Siciliano , Nicola Tonellotto , Fabrizio Silvestri

Conversational recommender systems (CRS) enable the traditional recommender systems to explicitly acquire user preferences towards items and attributes through interactive conversations. Reinforcement learning (RL) is widely adopted to…

Information Retrieval · Computer Science 2021-05-21 Yang Deng , Yaliang Li , Fei Sun , Bolin Ding , Wai Lam

Recommendation systems focus on helping users find items of interest in the situations of information overload, where users' preferences are typically estimated by the past observed behaviors. In contrast, conversational recommendation…

Computation and Language · Computer Science 2022-03-29 Ting-Chun Wang , Shang-Yu Su , Yun-Nung Chen

Large language models (LLMs) exhibit enhanced capabilities in language understanding and generation. By utilizing their embedded knowledge, LLMs are increasingly used as conversational recommender systems (CRS), achieving improved…

Information Retrieval · Computer Science 2026-04-14 Zhenrui Yue , Honglei Zhuang , Zhen Qin , Zhankui He , Huimin Zeng , Julian McAuley , Dong Wang

Industrial recommendation systems are typically composed of multiple stages, including retrieval, ranking, and blending. The retrieval stage plays a critical role in generating a high-recall set of candidate items that covers a wide range…

Information Retrieval · Computer Science 2025-07-01 Zhibo Fan , Hongtao Lin , Haoyu Chen , Bowen Deng , Hedi Xia , Yuke Yan , James Li