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We present a novel hierarchical model for human activity recognition. In contrast to approaches that successively recognize actions and activities, our approach jointly models actions and activities in a unified framework, and their labels…

Robotics · Computer Science 2015-03-09 Ninghang Hu , Gwenn Englebienne , Zhongyu Lou , Ben Kröse

In this paper, we report a hierarchical deep learning model for classification of complex human activities using motion sensors. In contrast to traditional Human Activity Recognition (HAR) models used for event-based activity recognition,…

Machine Learning · Computer Science 2022-07-19 Eric Rosen , Doruk Senkal

Image based social networks are among the most popular social networking services in recent years. With tremendous images uploaded everyday, understanding users' preferences on user-generated images and making recommendations have become an…

Social and Information Networks · Computer Science 2021-03-05 Le Wu , Lei Chen , Richang Hong , Yanjie Fu , Xing Xie , Meng Wang

Generative recommendation, which directly generates item identifiers, has emerged as a promising paradigm for recommendation systems. However, its potential is fundamentally constrained by the reliance on purely autoregressive training.…

Information Retrieval · Computer Science 2026-04-24 KaiWen Wei , Kejun He , Xiaomian Kang , Jie Zhang , Yuming Yang , Li Jin , Zhenyang Li , Jiang Zhong , He Bai , Junnan Zhu

Deep-learning based computer vision models have proved themselves to be ground-breaking approaches to human activity recognition (HAR). However, most existing works are dedicated to improve the prediction accuracy through either creating…

Computer Vision and Pattern Recognition · Computer Science 2021-02-04 Mahsun Altın , Furkan Gürsoy , Lina Xu

To fluently collaborate with people, robots need the ability to recognize human activities accurately. Although modern robots are equipped with various sensors, robust human activity recognition (HAR) still remains a challenging task for…

Robotics · Computer Science 2020-08-17 Md Mofijul Islam , Tariq Iqbal

Collaborative Metric Learning (CML) recently emerged as a powerful paradigm for recommendation based on implicit feedback collaborative filtering. However, standard CML methods learn fixed user and item representations, which fails to…

Information Retrieval · Computer Science 2021-08-11 Viet-Anh Tran , Guillaume Salha-Galvan , Romain Hennequin , Manuel Moussallam

Human Activity Recognition~(HAR) is the classification of human movement, captured using one or more sensors either as wearables or embedded in the environment~(e.g. depth cameras, pressure mats). State-of-the-art methods of HAR rely on…

Computer Vision and Pattern Recognition · Computer Science 2020-06-16 Anjana Wijekoon , Nirmalie Wiratunga

The chronological order of user-item interactions can reveal time-evolving and sequential user behaviors in many recommender systems. The items that users will interact with may depend on the items accessed in the past. However, the…

Information Retrieval · Computer Science 2019-12-30 Chen Ma , Liheng Ma , Yingxue Zhang , Jianing Sun , Xue Liu , Mark Coates

Sequential recommendations have drawn significant attention in modeling the user's historical behaviors to predict the next item. With the booming development of multimodal data (e.g., image, text) on internet platforms, sequential…

Information Retrieval · Computer Science 2024-12-12 Changhong Li , Zhiqiang Guo

In the last few years there has been a growing interest in Human Activity Recognition~(HAR) topic. Sensor-based HAR approaches, in particular, has been gaining more popularity owing to their privacy preserving nature. Furthermore, due to…

Machine Learning · Computer Science 2019-03-13 Parviz Asghari , Elnaz Soelimani , Ehsan Nazerfard

The combination of increased life expectancy and falling birth rates is resulting in an aging population. Wearable Sensor-based Human Activity Recognition (WSHAR) emerges as a promising assistive technology to support the daily lives of…

Signal Processing · Electrical Eng. & Systems 2024-04-25 Jianyuan Ni , Hao Tang , Syed Tousiful Haque , Yan Yan , Anne H. H. Ngu

Wi-Fi-based human activity recognition (HAR) has emerged as a promising approach for contactless sensing, leveraging channel state information (CSI) collected from wireless transceivers. While existing studies have primarily concentrated on…

Signal Processing · Electrical Eng. & Systems 2026-05-21 Amirhossein Mohammadi , Hina Tabassum

Given e-commerce scenarios that user profiles are invisible, session-based recommendation is proposed to generate recommendation results from short sessions. Previous work only considers the user's sequential behavior in the current…

Information Retrieval · Computer Science 2017-11-15 Jing Li , Pengjie Ren , Zhumin Chen , Zhaochun Ren , Jun Ma

Capturing users' precise preferences is of great importance in various recommender systems (eg., e-commerce platforms), which is the basis of how to present personalized interesting product lists to individual users. In spite of significant…

Information Retrieval · Computer Science 2021-10-11 Lianghao Xia , Chao Huang , Yong Xu , Peng Dai , Bo Zhang , Liefeng Bo

While the Self-Attention mechanism in the Transformer model has proven to be effective in many domains, we observe that it is less effective in more diverse settings (e.g. multimodality) due to the varying granularity of each token and the…

Computer Vision and Pattern Recognition · Computer Science 2024-06-06 Wayner Barrios , SouYoung Jin

Existing Masked Image Modeling methods apply fixed mask patterns to guide the self-supervised training. As those mask patterns resort to different criteria to depict image contents, sticking to a fixed pattern leads to a limited vision cues…

Computer Vision and Pattern Recognition · Computer Science 2025-04-15 Zhanzhou Feng , Shiliang Zhang

Attention, or prioritization of certain information items over others, is a critical element of any learning process, for both humans and machines. Given that humans continue to outperform machines in certain learning tasks, it seems…

Machine Learning · Computer Science 2025-02-21 Avihay Chriqui , Inbal Yahav , Dov Teeni , Ahmed Abbasi

The primary objective of human activity recognition (HAR) is to infer ongoing human actions from sensor data, a task that finds broad applications in health monitoring, safety protection, and sports analysis. Despite proliferating research,…

Computer Vision and Pattern Recognition · Computer Science 2025-07-14 Hang Xiao , Ying Yu , Jiarui Li , Zhifan Yang , Haotian Tang , Hanyu Liu , Chao Li

In real-world recommendation scenarios, users typically engage with platforms through multiple types of behavioral interactions. Multi-behavior recommendation algorithms aim to leverage various auxiliary user behaviors to enhance prediction…

Information Retrieval · Computer Science 2025-07-22 Hengyu Zhang , Chunxu Shen , Xiangguo Sun , Jie Tan , Yanchao Tan , Yu Rong , Hong Cheng , Lingling Yi