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In Human Activity Recognition (HAR), a predominant assumption is that the data utilized for training and evaluation purposes are drawn from the same distribution. It is also assumed that all data samples are independent and identically…

Machine Learning · Computer Science 2025-03-05 Xiaozhou Ye , Kevin I-Kai Wang

Human Activity Recognition (HAR) has shown remarkable effectiveness in various applications, such as smart healthcare and intelligent manufacturing. However, a major challenge faced by HAR is the distribution shift across different sensor…

Computer Vision and Pattern Recognition · Computer Science 2026-05-22 Zhiqing Hong , Zelong Li , Xiubin Fan , Guang Yang , Baoshen Guo , Haotian Wang , Tian He , Desheng Zhang

Despite the vast literature on Human Activity Recognition (HAR) with wearable inertial sensor data, it is perhaps surprising that there are few studies investigating semisupervised learning for HAR, particularly in a challenging scenario…

Machine Learning · Computer Science 2021-01-14 Govind Narasimman , Kangkang Lu , Arun Raja , Chuan Sheng Foo , Mohamed Sabry Aly , Jie Lin , Vijay Chandrasekhar

Sensor-based human activity recognition (HAR) has been an active research area, owing to its applications in smart environments, assisted living, fitness, healthcare, etc. Recently, deep learning based end-to-end training has resulted in…

Machine Learning · Computer Science 2024-01-19 Sourish Gunesh Dhekane , Thomas Ploetz

Human Activity Recognition (HAR) based on the sensors of mobile/wearable devices aims to detect the physical activities performed by humans in their daily lives. Although supervised learning methods are the most effective in this task,…

Signal Processing · Electrical Eng. & Systems 2024-04-25 Sannara Ek , Riccardo Presotto , Gabriele Civitarese , François Portet , Philippe Lalanda , Claudio Bettini

Mixup provides interpolated training samples and allows the model to obtain smoother decision boundaries for better generalization. The idea can be naturally applied to the domain adaptation task, where we can mix the source and target…

Computer Vision and Pattern Recognition · Computer Science 2023-03-20 Daehan Kim , Minseok Seo , Kwanyong Park , Inkyu Shin , Sanghyun Woo , In-So Kweon , Dong-Geol Choi

Despite recent advances in semantic segmentation, an inevitable challenge is the performance degradation caused by the domain shift in real applications. Current dominant approach to solve this problem is unsupervised domain adaptation…

Computer Vision and Pattern Recognition · Computer Science 2024-04-12 Weifu Fu , Qiang Nie , Jialin Li , Yuhuan Lin , Kai Wu , Jian Li , Yabiao Wang , Yong Liu , Chengjie Wang

Heterogeneous domain adaptation (HDA) transfers knowledge across source and target domains that present heterogeneities e.g., distinct domain distributions and difference in feature type or dimension. Most previous HDA methods tackle this…

Computer Vision and Pattern Recognition · Computer Science 2021-05-06 Shuang Li , Binhui Xie , Jiashu Wu , Ying Zhao , Chi Harold Liu , Zhengming Ding

When domains, which represent underlying data distributions, vary during training and testing processes, deep neural networks suffer a drop in their performance. Domain generalization allows improvements in the generalization performance…

Computer Vision and Pattern Recognition · Computer Science 2019-11-19 Toshihiko Matsuura , Tatsuya Harada

Human Activity Recognition (HAR) has seen significant advancements with the adoption of deep learning techniques, yet challenges remain in terms of data requirements, reliability and robustness. This paper explores a novel application of…

Machine Learning · Computer Science 2025-09-11 Matthew Nolan , Lina Yao , Robert Davidson

We consider human activity recognition (HAR) from wearable sensor data in manual-work processes, like warehouse order-picking. Such structured domains can often be partitioned into distinct process steps, e.g., packaging or transporting.…

Signal Processing · Electrical Eng. & Systems 2021-11-09 Stefan Lüdtke , Fernando Moya Rueda , Waqas Ahmed , Gernot A. Fink , Thomas Kirste

The state of the art in semantic segmentation is steadily increasing in performance, resulting in more precise and reliable segmentations in many different applications. However, progress is limited by the cost of generating labels for…

Computer Vision and Pattern Recognition · Computer Science 2020-12-01 Viktor Olsson , Wilhelm Tranheden , Juliano Pinto , Lennart Svensson

Deep models trained on source domain lack generalization when evaluated on unseen target domains with different data distributions. The problem becomes even more pronounced when we have no access to target domain samples for adaptation. In…

Computer Vision and Pattern Recognition · Computer Science 2022-04-05 Duo Peng , Yinjie Lei , Munawar Hayat , Yulan Guo , Wen Li

Deep learning has proven to be an effective approach in the field of Human activity recognition (HAR), outperforming other architectures that require manual feature engineering. Despite recent advancements, challenges inherent to HAR data,…

Machine Learning · Computer Science 2023-07-18 Yiran Huang , Yexu Zhou , Till Riedel , Likun Fang , Michael Beigl

Learning and understanding the typical patterns in the daily activities and routines of people from low-level sensory data is an important problem in many application domains such as building smart environments, or providing intelligent…

Machine Learning · Computer Science 2014-08-14 Truyen Tran , Hung Bui , Svetha Venkatesh

It is expensive and time-consuming to collect sufficient labeled data for human activity recognition (HAR). Domain adaptation is a promising approach for cross-domain activity recognition. Existing methods mainly focus on adapting…

Signal Processing · Electrical Eng. & Systems 2021-09-17 Wang Lu , Yiqiang Chen , Jindong Wang , Xin Qin

Compared to unsupervised domain adaptation, semi-supervised domain adaptation (SSDA) aims to significantly improve the classification performance and generalization capability of the model by leveraging the presence of a small amount of…

Computer Vision and Pattern Recognition · Computer Science 2024-01-23 Jichang Li , Guanbin Li , Yizhou Yu

Despite plenty of efforts focusing on improving the domain adaptation ability (DA) under unsupervised or few-shot semi-supervised settings, recently the solution of active learning started to attract more attention due to its suitability in…

Machine Learning · Computer Science 2022-04-05 Ming Xie , Yuxi Li , Yabiao Wang , Zekun Luo , Zhenye Gan , Zhongyi Sun , Mingmin Chi , Chengjie Wang , Pei Wang

Sensor-based Human Activity Recognition (HAR) is crucial in ubiquitous computing, analysing behaviours through multi-dimensional observations. Despite research progress, HAR confronts challenges, particularly in data distribution…

Signal Processing · Electrical Eng. & Systems 2025-03-05 Xiaozhou Ye , Kouichi Sakurai , Nirmal Nair , Kevin I-Kai Wang

Mixup is a well-known data-dependent augmentation technique for DNNs, consisting of two sub-tasks: mixup generation and classification. However, the recent dominant online training method confines mixup to supervised learning (SL), and the…

Computer Vision and Pattern Recognition · Computer Science 2023-05-24 Siyuan Li , Zicheng Liu , Zedong Wang , Di Wu , Zihan Liu , Stan Z. Li