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In offline reinforcement learning (RL), an RL agent learns to solve a task using only a fixed dataset of previously collected data. While offline RL has been successful in learning real-world robot control policies, it typically requires…

Machine Learning · Computer Science 2024-08-09 Nicholas E. Corrado , Yuxiao Qu , John U. Balis , Adam Labiosa , Josiah P. Hanna

Because imitation learning relies on human demonstrations in hard-to-simulate settings, the inclusion of force control in this method has resulted in a shortage of training data, even with a simple change in speed. Although the field of…

Robotics · Computer Science 2025-05-07 Nozomu Masuya , Hiroshi Sato , Koki Yamane , Takuya Kusume , Sho Sakaino , Toshiaki Tsuji

Inertial Measurement Unit (IMU)-based Human Activity Recognition (HAR) aims to interpret and classify user behaviors from temporal motion signals. Recently, deep learning frameworks have advanced this task by learning and extracting…

Signal Processing · Electrical Eng. & Systems 2026-05-12 Peng Liao , Shangsong Liang , Lin Chen , Peijia Zheng

Recently, data augmentation (DA) has emerged as a method for leveraging domain knowledge to inexpensively generate additional data in reinforcement learning (RL) tasks, often yielding substantial improvements in data efficiency. While prior…

Machine Learning · Computer Science 2024-03-19 Nicholas E. Corrado , Josiah P. Hanna

Data augmentation has been widely used in low-resource NER tasks to tackle the problem of data sparsity. However, previous data augmentation methods have the disadvantages of disrupted syntactic structures, token-label mismatch, and…

Computation and Language · Computer Science 2023-07-18 Sihan Song , Furao Shen , Jian Zhao

The use of supervised learning for Human Activity Recognition (HAR) on mobile devices leads to strong classification performances. Such an approach, however, requires large amounts of labeled data, both for the initial training of the…

Computer Vision and Pattern Recognition · Computer Science 2023-06-27 Riccardo Presotto , Sannara Ek , Gabriele Civitarese , François Portet , Philippe Lalanda , Claudio Bettini

As a critical component of Wearable AI, IMU-based Human Activity Recognition (HAR) has attracted increasing attention from both academia and industry in recent years. Although HAR performance has improved considerably in specific scenarios,…

Signal Processing · Electrical Eng. & Systems 2025-08-19 Yize Cai , Baoshen Guo , Flora Salim , Zhiqing Hong

Data augmentation is a crucial regularization technique for deep neural networks, particularly in medical image classification. Mainstream data augmentation (DA) methods are usually applied at the image level. Due to the specificity and…

Computer Vision and Pattern Recognition · Computer Science 2024-06-28 Yaoyao Zhu , Xiuding Cai , Xueyao Wang , Xiaoqing Chen , Yu Yao , Zhongliang Fu

Humans use multiple communication channels to interact with each other. For instance, body gestures or facial expressions are commonly used to convey an intent. The use of such non-verbal cues has motivated the development of prediction…

Robotics · Computer Science 2024-10-02 Christian Arzate Cruz , Yotam Sechayk , Takeo Igarashi , Randy Gomez

This paper focuses on addressing the problem of data scarcity for gait analysis. Standard augmentation methods may produce gait sequences that are not consistent with the biomechanical constraints of human walking. To address this issue, we…

Computer Vision and Pattern Recognition · Computer Science 2023-07-24 Mritula Chandrasekaran , Jarek Francik , Dimitrios Makris

Human Activity Recognition (HAR) based on wearable inertial sensors plays a critical role in remote health monitoring. In patients with movement disorders, the ability to detect abnormal patient movements in their home environments can…

Together with the rapid development of the Internet of Things (IoT), human activity recognition (HAR) using wearable Inertial Measurement Units (IMUs) becomes a promising technology for many research areas. Recently, deep learning-based…

Computer Vision and Pattern Recognition · Computer Science 2020-10-12 Ling Pei , Songpengcheng Xia , Lei Chu , Fanyi Xiao , Qi Wu , Wenxian Yu , Robert Qiu

The application of deep learning to build accurate predictive models from functional neuroimaging data is often hindered by limited dataset sizes. Though data augmentation can help mitigate such training obstacles, most data augmentation…

Machine Learning · Computer Science 2019-10-21 Kevin P. Nguyen , Cherise Chin Fatt , Alex Treacher , Cooper Mellema , Madhukar H. Trivedi , Albert Montillo

Unobtrusive and smart recognition of human activities using smartphones inertial sensors is an interesting topic in the field of artificial intelligence acquired tremendous popularity among researchers, especially in recent years. A…

Machine Learning · Computer Science 2021-09-21 Meysam Vakili , Masoumeh Rezaei

Deep learning-based methods have reached state of the art performances, relying on large quantity of available data and computational power. Such methods still remain highly inappropriate when facing a major open machine learning problem,…

Computer Vision and Pattern Recognition · Computer Science 2018-10-05 Ghouthi Boukli Hacene , Vincent Gripon , Nicolas Farrugia , Matthieu Arzel , Michel Jezequel

Data augmentation (DA) is an essential technique for training state-of-the-art deep learning systems. In this paper, we empirically show data augmentation might introduce noisy augmented examples and consequently hurt the performance on…

Computer Vision and Pattern Recognition · Computer Science 2020-11-25 Chengyue Gong , Dilin Wang , Meng Li , Vikas Chandra , Qiang Liu

Human Activity Recognition (HAR) using wearable inertial measurement unit (IMU) sensors can revolutionize healthcare by enabling continual health monitoring, disease prediction, and routine recognition. Despite the high accuracy of Deep…

Human-Computer Interaction · Computer Science 2025-03-17 Azhar Ali Khaked , Nobuyuki Oishi , Daniel Roggen , Paula Lago

The development of robust, generalized models in human activity recognition (HAR) has been hindered by the scarcity of large-scale, labeled data sets. Recent work has shown that virtual IMU data extracted from videos using computer vision…

Computer Vision and Pattern Recognition · Computer Science 2023-05-08 Zikang Leng , Hyeokhyen Kwon , Thomas Plötz

While hyperspectral images (HSI) benefit from numerous spectral channels that provide rich information for classification, the increased dimensionality and sensor variability make them more sensitive to distributional discrepancies across…

Computer Vision and Pattern Recognition · Computer Science 2026-03-18 Taiqin Chen , Yifeng Wang , Xiaochen Feng , Zhilin Zhu , Hao Sha , Yingjian Li , Yongbing Zhang

Machine learning and deep learning have shown great promise in mobile sensing applications, including Human Activity Recognition. However, the performance of such models in real-world settings largely depends on the availability of large…

Machine Learning · Computer Science 2021-02-12 Chi Ian Tang , Ignacio Perez-Pozuelo , Dimitris Spathis , Soren Brage , Nick Wareham , Cecilia Mascolo