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Continual Test-Time Adaptation (CTTA) aims to adapt a source pre-trained model to continually changing target domains during inference. As a fundamental principle, an ideal CTTA method should rapidly adapt to new domains (exploration) while…

Computer Vision and Pattern Recognition · Computer Science 2025-08-19 Pinci Yang , Peisong Wen , Ke Ma , Qianqian Xu

Test-Time Adaptation (TTA) enables pre-trained models to adjust to distribution shift by learning from unlabeled test-time streams. However, existing methods typically treat these streams as independent samples, overlooking the supervisory…

Machine Learning · Computer Science 2026-01-30 Young Kyung Kim , Oded Schlesinger , Qiangqiang Wu , J. Matías Di Martino , Guillermo Sapiro

Test-time adaptation aims to adapt pre-trained deep neural networks using solely online unlabelled test data during inference. Although TTA has shown promise in visual applications, its potential in time series contexts remains largely…

Machine Learning · Computer Science 2025-01-06 Peiliang Gong , Mohamed Ragab , Min Wu , Zhenghua Chen , Yongyi Su , Xiaoli Li , Daoqiang Zhang

Test-time adaptation (TTA) seeks to tackle potential distribution shifts between training and test data by adapting a given model w.r.t. any test sample. Although recent TTA has shown promising performance, we still face two key challenges:…

Machine Learning · Computer Science 2025-08-27 Mingkui Tan , Guohao Chen , Jiaxiang Wu , Yifan Zhang , Yaofo Chen , Peilin Zhao , Shuaicheng Niu

Deploying models on target domain data subject to distribution shift requires adaptation. Test-time training (TTT) emerges as a solution to this adaptation under a realistic scenario where access to full source domain data is not available,…

Machine Learning · Computer Science 2023-03-21 Yongyi Su , Xun Xu , Tianrui Li , Kui Jia

Continual Test-Time Adaptation (CTTA) is an emerging and challenging task where a model trained in a source domain must adapt to continuously changing conditions during testing, without access to the original source data. CTTA is prone to…

Machine Learning · Computer Science 2024-05-29 Ziqi Shi , Fan Lyu , Ye Liu , Fanhua Shang , Fuyuan Hu , Wei Feng , Zhang Zhang , Liang Wang

Encountering shifted data at test time is a ubiquitous challenge when deploying predictive models. Test-time adaptation (TTA) methods address this issue by continuously adapting a deployed model using only unlabeled test data. While TTA can…

Machine Learning · Computer Science 2025-11-11 Mona Schirmer , Metod Jazbec , Christian A. Naesseth , Eric Nalisnick

A foundational requirement of a deployed ML model is to generalize to data drawn from a testing distribution that is different from training. A popular solution to this problem is to adapt a pre-trained model to novel domains using only…

Computer Vision and Pattern Recognition · Computer Science 2022-07-12 Kowshik Thopalli , Pavan Turaga , Jayaraman J. Thiagarajan

Prior to the deployment of robotic systems, pre-training the deep-recognition models on all potential visual cases is infeasible in practice. Hence, test-time adaptation (TTA) allows the model to adapt itself to novel environments and…

Computer Vision and Pattern Recognition · Computer Science 2023-04-18 Junha Song , Kwanyong Park , InKyu Shin , Sanghyun Woo , Chaoning Zhang , In So Kweon

Current test-time adaptation (TTA) approaches aim to adapt a machine learning model to environments that change continuously. Yet, it is unclear whether TTA methods can maintain their adaptability over prolonged periods. To answer this…

Computer Vision and Pattern Recognition · Computer Science 2024-11-05 Trung-Hieu Hoang , Duc Minh Vo , Minh N. Do

Test-Time Adaptation (TTA) has recently emerged as a promising approach for tackling the robustness challenge under distribution shifts. However, the lack of consistent settings and systematic studies in prior literature hinders thorough…

Machine Learning · Computer Science 2023-06-07 Hao Zhao , Yuejiang Liu , Alexandre Alahi , Tao Lin

Test-Time Adaptation (TTA) allows to update pre-trained models to changing data distributions at deployment time. While early work tested these algorithms for individual fixed distribution shifts, recent work proposed and applied methods…

Machine Learning · Computer Science 2024-04-04 Ori Press , Steffen Schneider , Matthias Kümmerer , Matthias Bethge

Time series domain adaptation aims to transfer the complex temporal dependence from the labeled source domain to the unlabeled target domain. Recent advances leverage the stable causal mechanism over observed variables to model the…

Machine Learning · Computer Science 2025-02-25 Ruichu Cai , Junxian Huang , Zhenhui Yang , Zijian Li , Emadeldeen Eldele , Min Wu , Fuchun Sun

Test-time adaptation (TTA) aims to adapt a pretrained model to distribution shifts using only unlabeled test data. While promising, existing methods like Tent suffer from instability and can catastrophically forget the source knowledge,…

Machine Learning · Computer Science 2025-10-08 Harshil Vejendla

Test-Time Adaptation (TTA) adapts pre-trained models using only unlabeled test streams, requiring real-time inference and update without access to source data. We propose StructuralTest-time Alignment of Gradients (STAG), a lightweight…

Computer Vision and Pattern Recognition · Computer Science 2026-02-09 Juhyeon Shin , Yujin Oh , Jonghyun Lee , Saehyung Lee , Minjun Park , Dongjun Lee , Uiwon Hwang , Sungroh Yoon

Test-time adaptation (TTA) has emerged as a viable solution to adapt pre-trained models to domain shifts using unlabeled test data. However, TTA faces challenges of adaptation failures due to its reliance on blind adaptation to unknown test…

Machine Learning · Computer Science 2024-04-03 Taeckyung Lee , Sorn Chottananurak , Taesik Gong , Sung-Ju Lee

Deep neural networks have useful applications in many different tasks, however their performance can be severely affected by changes in the data distribution. For example, in the biomedical field, their performance can be affected by…

Computer Vision and Pattern Recognition · Computer Science 2024-05-30 Pedro Vianna , Muawiz Chaudhary , Paria Mehrbod , An Tang , Guy Cloutier , Guy Wolf , Michael Eickenberg , Eugene Belilovsky

Vision-language models (VLMs) such as CLIP and Grounding DINO have achieved remarkable success in object recognition and detection. However, their performance often degrades under real-world distribution shifts. Test-time adaptation (TTA)…

Computer Vision and Pattern Recognition · Computer Science 2025-10-06 Lihua Zhou , Mao Ye , Shuaifeng Li , Nianxin Li , Jinlin Wu , Xiatian Zhu , Lei Deng , Hongbin Liu , Jiebo Luo , Zhen Lei

Real-world vision models in dynamic environments face rapid shifts in domain distributions, leading to decreased recognition performance. Using unlabeled test data, continuous test-time adaptation (CTTA) directly adjusts a pre-trained…

Computer Vision and Pattern Recognition · Computer Science 2025-01-28 Sarthak Kumar Maharana , Baoming Zhang , Yunhui Guo

The performance of deep learning models depends heavily on test samples at runtime, and shifts from the training data distribution can significantly reduce accuracy. Test-time adaptation (TTA) addresses this by adapting models during…

Machine Learning · Computer Science 2026-02-03 Michal Danilowski , Soumyajit Chatterjee , Abhirup Ghosh