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This paper proposes Group Activity Feature (GAF) learning without group activity annotations. Unlike prior work, which uses low-level static local features to learn GAFs, we propose leveraging dynamics-aware and group-aware pretext tasks,…

Computer Vision and Pattern Recognition · Computer Science 2026-04-07 Ryuki Tezuka , Chihiro Nakatani , Norimichi Ukita

Currently, next location recommendation plays a vital role in location-based social network applications and services. Although many methods have been proposed to solve this problem, three important challenges have not been well addressed…

Social and Information Networks · Computer Science 2021-12-17 Huifeng Li , Bin Wang , Sulei Zhu , Yanyan Xu

In this paper, we propose a probabilistic generative model, called unified model, which naturally unifies the ideas of social influence, collaborative filtering and content-based methods for item recommendation. To address the issue of…

Social and Information Networks · Computer Science 2011-09-06 Mao Ye , Xingjie Liu , Wang-Chien Lee

The state-of-the art solutions for human activity understanding from a video stream formulate the task as a spatio-temporal problem which requires joint localization of all individuals in the scene and classification of their actions or…

Computer Vision and Pattern Recognition · Computer Science 2020-07-29 Mahsa Ehsanpour , Alireza Abedin , Fatemeh Saleh , Javen Shi , Ian Reid , Hamid Rezatofighi

Due to the advances in mobile computing and multimedia techniques, there are vast amount of multimedia data with geographical information collected in multifarious applications. In this paper, we propose a novel type of image search named…

Multimedia · Computer Science 2018-06-05 Jun Long , Lei Zhu , Chengyuan Zhang , Zhan Yang , Yunwu Lin , Ruipeng Chen

The use of pre-training is an emerging technique to enhance a neural model's performance, which has been shown to be effective for many neural language models such as BERT. This technique has also been used to enhance the performance of…

Information Retrieval · Computer Science 2023-11-28 Siwei Liu , Xi Wang , Craig Macdonald , Iadh Ounis

Active visual exploration aims to assist an agent with a limited field of view to understand its environment based on partial observations made by choosing the best viewing directions in the scene. Recent methods have tried to address this…

Computer Vision and Pattern Recognition · Computer Science 2021-08-27 Soroush Seifi , Abhishek Jha , Tinne Tuytelaars

Thanks to widely available, cheap Internet access and the ubiquity of smartphones, millions of people around the world now use online location-based social networking services. Understanding the structural properties of these systems and…

Physics and Society · Physics 2013-07-02 Chloë Brown , Vincenzo Nicosia , Salvatore Scellato , Anastasios Noulas , Cecilia Mascolo

With the prevalence of Internet of Things (IoT)-based social media applications, the distance among people has been greatly shortened. As a result, recommender systems in IoT-based social media need to be developed oriented to groups of…

Information Retrieval · Computer Science 2021-04-26 Zhiwei Guo , Keping Yu , Tan Guo , Ali Kashif Bashir , Muhammad Imran , Mohsen Guizani

We analyze two large datasets from technological networks with location and social data: user location records from an online location-based social networking service, and anonymized telecommunications data from a European cellphone…

Social and Information Networks · Computer Science 2015-06-22 Chloë Brown , Neal Lathia , Anastasios Noulas , Cecilia Mascolo , Vincent Blondel

Pedestrian trajectory prediction for surveillance video is one of the important research topics in the field of computer vision and a key technology of intelligent surveillance systems. Social relationship among pedestrians is a key factor…

Computer Vision and Pattern Recognition · Computer Science 2021-04-01 Yusheng Peng , Gaofeng Zhang , Jun Shi , Benzhu Xu , Liping Zheng

Sequential recommendation aims to choose the most suitable items for a user at a specific timestamp given historical behaviors. Existing methods usually model the user behavior sequence based on the transition-based methods like Markov…

Information Retrieval · Computer Science 2022-07-11 Zijian Li , Ruichu Cai , Fengzhu Wu , Sili Zhang , Hao Gu , Yuexing Hao , Yuguang

Group activity recognition is a hot topic in computer vision. Recognizing activities through group relationships plays a vital role in group activity recognition. It holds practical implications in various scenarios, such as video analysis,…

Computer Vision and Pattern Recognition · Computer Science 2023-07-26 Chuanchuan Wang , Ahmad Sufril Azlan Mohamed

Point-Of-Interest (POI) recommendation aims to mine a user's visiting history and find her/his potentially preferred places. Although location recommendation methods have been studied and improved pervasively, the challenges w.r.t employing…

Computers and Society · Computer Science 2017-01-04 Saeid Hosseini , Hongzhi Yin , Xiaofang Zhou , Shazia Sadiq

Pedestrian trajectory prediction is valuable for understanding human motion behaviors and it is challenging because of the social influence from other pedestrians, the scene constraints and the multimodal possibilities of predicted…

Computer Vision and Pattern Recognition · Computer Science 2020-10-13 Hao Xue , Du Q. Huynh , Mark Reynolds

Predicting the next place to visit is a key in human mobility behavior modeling, which plays a significant role in various fields, such as epidemic control, urban planning, traffic management, and travel recommendation. To achieve this, one…

Machine Learning · Computer Science 2021-10-19 Huifeng Li , Bin Wang , Fan Xia , Xi Zhai , Sulei Zhu , Yanyan Xu

Social recommendation leverages social information to solve data sparsity and cold-start problems in traditional collaborative filtering methods. However, most existing models assume that social effects from friend users are static and…

Information Retrieval · Computer Science 2019-03-26 Qitian Wu , Hengrui Zhang , Xiaofeng Gao , Peng He , Paul Weng , Han Gao , Guihai Chen

In the field of group recommendation systems (GRS), effectively addressing the diverse preferences of group members poses a significant challenge. Traditional GRS approaches often aggregate individual preferences into a collective group…

Information Retrieval · Computer Science 2025-03-18 Peijin Yu , Shin'ichi Konomi

Adaptively forecasting human behavior in social settings is an important step toward achieving Artificial General Intelligence. Most existing research in social forecasting has focused either on unfocused interactions, such as pedestrian…

Machine Learning · Computer Science 2025-01-06 Augustinas Jučas , Chirag Raman

Spatial item recommendation has become an important means to help people discover interesting locations, especially when people pay a visit to unfamiliar regions. Some current researches are focusing on modelling individual and collective…

Social and Information Networks · Computer Science 2017-06-21 Hao Wang , Yanmei Fu , Qinyong Wang , Hongzhi Yin , Changying Du , Hui Xiong