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We focus on a relatively unexplored learning paradigm known as {\em Online Unsupervised Continual Learning} (O-UCL), where an agent receives a non-stationary, unlabeled data stream and progressively learns to identify an increasing number…

Machine Learning · Computer Science 2024-09-26 Cameron Taylor , Vassilis Vassiliades , Constantine Dovrolis

Online continual learning requires the models to learn from constant, endless streams of data. While significant efforts have been made in this field, most were focused on mitigating the catastrophic forgetting issue to achieve better…

Machine Learning · Computer Science 2024-10-14 Xinrui Wang , Chuanxing Geng , Wenhai Wan , Shao-yuan Li , Songcan Chen

Continual Learning (CL) aims to develop agents emulating the human ability to sequentially learn new tasks while being able to retain knowledge obtained from past experiences. In this paper, we introduce the novel problem of…

Computer Vision and Pattern Recognition · Computer Science 2022-01-13 Enrico Fini , Stéphane Lathuilière , Enver Sangineto , Moin Nabi , Elisa Ricci

Unsupervised anomaly detection aims to build models to effectively detect unseen anomalies by only training on the normal data. Although previous reconstruction-based methods have made fruitful progress, their generalization ability is…

Machine Learning · Computer Science 2022-01-04 Yuxin Zhang , Jindong Wang , Yiqiang Chen , Han Yu , Tao Qin

Recent years have witnessed a burgeoning interest in federated learning (FL). However, the contexts in which clients engage in sequential learning remain under-explored. Bridging FL and continual learning (CL) gives rise to a challenging…

Machine Learning · Computer Science 2025-02-21 Abudukelimu Wuerkaixi , Sen Cui , Jingfeng Zhang , Kunda Yan , Bo Han , Gang Niu , Lei Fang , Changshui Zhang , Masashi Sugiyama

Existing research on continual learning (CL) of a sequence of tasks focuses mainly on dealing with catastrophic forgetting (CF) to balance the learning plasticity of new tasks and the memory stability of old tasks. However, an ideal CL…

Machine Learning · Computer Science 2026-01-12 Zhi Wang , Zhongbin Wu , Yanni Li , Bing Liu , Guangxi Li , Yuping Wang

In autonomous driving, even a meticulously trained model can encounter failures when facing unfamiliar scenarios. One of these scenarios can be formulated as an online continual learning (OCL) problem. That is, data come in an online…

Machine Learning · Computer Science 2024-11-06 Huiping Zhuang , Di Fang , Kai Tong , Yuchen Liu , Ziqian Zeng , Xu Zhou , Cen Chen

Unsupervised out-of-distribution (OOD) Detection aims to separate the samples falling outside the distribution of training data without label information. Among numerous branches, contrastive learning has shown its excellent capability of…

Computer Vision and Pattern Recognition · Computer Science 2023-02-07 Menglong Chen , Xingtai Gui , Shicai Fan

Self-supervised learning (SSL) is able to build latent representations that generalize well to unseen data. However, only a few SSL techniques exist for the online CL setting, where data arrives in small minibatches, the model must comply…

Machine Learning · Computer Science 2025-07-16 Giacomo Cignoni , Andrea Cossu , Alexandra Gomez-Villa , Joost van de Weijer , Antonio Carta

In recent years, speech-based self-supervised learning (SSL) has made significant progress in various tasks, including automatic speech recognition (ASR). An ASR model with decent performance can be realized by fine-tuning an SSL model with…

Audio and Speech Processing · Electrical Eng. & Systems 2023-08-30 Zhisheng Zheng , Ziyang Ma , Yu Wang , Xie Chen

Continual learning is a process that involves training learning agents to sequentially master a stream of tasks or classes without revisiting past data. The challenge lies in leveraging previously acquired knowledge to learn new tasks…

Machine Learning · Computer Science 2024-02-21 Marcus de Carvalho , Mahardhika Pratama , Jie Zhang , Chua Haoyan , Edward Yapp

In this paper, we discuss a different type of semi-supervised setting: a coarse level of labeling is available for all observations but the model has to learn a fine level of latent annotation for each one of them. Problems in this setting…

Machine Learning · Computer Science 2017-08-10 Ozsel Kilinc , Ismail Uysal

In this work, we present the first study addressing automatic speech recognition (ASR) for children in an online learning setting. This is particularly important for both child-centric applications and the privacy protection of minors,…

Audio and Speech Processing · Electrical Eng. & Systems 2025-10-07 Edem Ahadzi , Vishwanath Pratap Singh , Tomi Kinnunen , Ville Hautamaki

End-to-end automatic speech recognition (ASR) can achieve promising performance with large-scale training data. However, it is known that domain mismatch between training and testing data often leads to a degradation of recognition…

Sound · Computer Science 2021-06-10 Wenxin Hou , Jindong Wang , Xu Tan , Tao Qin , Takahiro Shinozaki

Continual Learning (CL) aims to incrementally update a trained model on new tasks without forgetting the acquired knowledge of old ones. Existing CL methods usually reduce forgetting with task priors, \ie using task identity or a subset of…

Computer Vision and Pattern Recognition · Computer Science 2023-10-17 Tao Zhuo , Zhiyong Cheng , Hehe Fan , Mohan Kankanhalli

Face Anti-Spoofing (FAS) is recently studied under the continual learning setting, where the FAS models are expected to evolve after encountering the data from new domains. However, existing methods need extra replay buffers to store…

Computer Vision and Pattern Recognition · Computer Science 2023-03-20 Rizhao Cai , Yawen Cui , Zhi Li , Zitong Yu , Haoliang Li , Yongjian Hu , Alex Kot

Self-supervised learning (SSL) has shown remarkable performance in computer vision tasks when trained offline. However, in a Continual Learning (CL) scenario where new data is introduced progressively, models still suffer from catastrophic…

Machine Learning · Computer Science 2024-02-08 Chi Ian Tang , Lorena Qendro , Dimitris Spathis , Fahim Kawsar , Cecilia Mascolo , Akhil Mathur

The ability to learn in dynamic, nonstationary environments without forgetting previous knowledge, also known as Continual Learning (CL), is a key enabler for scalable and trustworthy deployments of adaptive solutions. While the importance…

Machine Learning · Computer Science 2021-03-25 Andrea Cossu , Antonio Carta , Davide Bacciu

Benefiting from massive corpora and advanced hardware, large language models (LLMs) exhibit remarkable capabilities in language understanding and generation. However, their performance degrades in scenarios where multiple tasks are…

Computation and Language · Computer Science 2023-10-24 Xiao Wang , Tianze Chen , Qiming Ge , Han Xia , Rong Bao , Rui Zheng , Qi Zhang , Tao Gui , Xuanjing Huang

Continual learning (CL) enables animals to learn new tasks without erasing prior knowledge. CL in artificial neural networks (NNs) is challenging due to catastrophic forgetting, where new learning degrades performance on older tasks. While…

Machine Learning · Computer Science 2025-01-28 Haozhe Shan , Qianyi Li , Haim Sompolinsky