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Jamming devices pose a significant threat by disrupting signals from the global navigation satellite system (GNSS), compromising the robustness of accurate positioning. Detecting anomalies in frequency snapshots is crucial to counteract…

Signal Processing · Electrical Eng. & Systems 2024-10-08 Felix Ott , Lucas Heublein , Nisha Lakshmana Raichur , Tobias Feigl , Jonathan Hansen , Alexander Rügamer , Christopher Mutschler

We present MetaUVFS as the first Unsupervised Meta-learning algorithm for Video Few-Shot action recognition. MetaUVFS leverages over 550K unlabeled videos to train a two-stream 2D and 3D CNN architecture via contrastive learning to capture…

Computer Vision and Pattern Recognition · Computer Science 2021-10-12 Jay Patravali , Gaurav Mittal , Ye Yu , Fuxin Li , Mei Chen

Identifying covariate shift is crucial for making machine learning systems robust in the real world and for detecting training data biases that are not reflected in test data. However, detecting covariate shift is challenging, especially…

Machine Learning · Computer Science 2021-08-20 Matthew L. Olson , Thuy-Vy Nguyen , Gaurav Dixit , Neale Ratzlaff , Weng-Keen Wong , Minsuk Kahng

The objective of Few-shot learning is to fully leverage the limited data resources for exploring the latent correlations within the data by applying algorithms and training a model with outstanding performance that can adequately meet the…

Computer Vision and Pattern Recognition · Computer Science 2025-06-24 Wenqing Zhao , Guojia Xie , Han Pan , Biao Yang , Weichuan Zhang

Few-shot image classification learns to recognize new categories from limited labelled data. Metric learning based approaches have been widely investigated, where a query sample is classified by finding the nearest prototype from the…

Computer Vision and Pattern Recognition · Computer Science 2021-06-04 Zhizheng Zhang , Cuiling Lan , Wenjun Zeng , Zhibo Chen , Shih-Fu Chang

Few-shot classification aims to learn a classifier to recognize unseen classes during training with limited labeled examples. While significant progress has been made, the growing complexity of network designs, meta-learning algorithms, and…

Computer Vision and Pattern Recognition · Computer Science 2020-01-14 Wei-Yu Chen , Yen-Cheng Liu , Zsolt Kira , Yu-Chiang Frank Wang , Jia-Bin Huang

User modeling, which aims to capture users' characteristics or interests, heavily relies on task-specific labeled data and suffers from the data sparsity issue. Several recent studies tackled this problem by pre-training the user model on…

Information Retrieval · Computer Science 2023-10-25 Yang Yu , Qi Liu , Kai Zhang , Yuren Zhang , Chao Song , Min Hou , Yuqing Yuan , Zhihao Ye , Zaixi Zhang , Sanshi Lei Yu

Few-shot classification aims at classifying categories of a novel task by learning from just a few (typically, 1 to 5) labelled examples. An effective approach to few-shot classification involves a prior model trained on a large-sample base…

Computer Vision and Pattern Recognition · Computer Science 2021-09-22 Rajshekhar Das , Yu-Xiong Wang , JoséM. F. Moura

The major paradigm of applying a pre-trained language model to downstream tasks is to fine-tune it on labeled task data, which often suffers instability and low performance when the labeled examples are scarce.~One way to alleviate this…

Computation and Language · Computer Science 2021-06-07 Ruikun Luo , Guanhuan Huang , Xiaojun Quan

Large-scale contrastive vision-language pre-trained models provide the zero-shot model achieving competitive performance across a range of image classification tasks without requiring training on downstream data. Recent works have confirmed…

Machine Learning · Computer Science 2024-04-02 Giung Nam , Byeongho Heo , Juho Lee

Large-scale multimodal foundation models, particularly Contrastive Captioners (CoCa), have achieved state-of-the-art results by unifying contrastive alignment with generative captioning. While zero-shot transfer capabilities are…

Computer Vision and Pattern Recognition · Computer Science 2025-12-16 N. K. B. M. P. K. B. Narasinghe , Uthayasanker Thayasivam

Few-shot image classification remains a critical challenge in the field of computer vision, particularly in data-scarce environments. Existing methods typically rely on pre-trained visual-language models, such as CLIP. However, due to the…

Computer Vision and Pattern Recognition · Computer Science 2026-02-17 Xi Yang , Pai Peng , Wulin Xie , Xiaohuan Lu , Jie Wen

Few-shot image classification (FSIC), which requires a model to recognize new categories via learning from few images of these categories, has attracted lots of attention. Recently, meta-learning based methods have been shown as a promising…

Computer Vision and Pattern Recognition · Computer Science 2021-09-08 Yunxiao Qin , Weiguo Zhang , Zezheng Wang , Chenxu Zhao , Jingping Shi

Generative query rewrite generates reconstructed query rewrites using the conversation history while rely heavily on gold rewrite pairs that are expensive to obtain. Recently, few-shot learning is gaining increasing popularity for this…

Computation and Language · Computer Science 2024-03-19 Yifei Yuan , Chen Shi , Runze Wang , Liyi Chen , Renjun Hu , Zengming Zhang , Feijun Jiang , Wai Lam

We propose Few-Example Clustering (FEC), a novel algorithm that performs contrastive learning to cluster few examples. Our method is composed of the following three steps: (1) generation of candidate cluster assignments, (2) contrastive…

Machine Learning · Computer Science 2022-07-12 Minguk Jang , Sae-Young Chung

This paper investigates a valuable setting called few-shot unsupervised domain adaptation (FS-UDA), which has not been sufficiently studied in the literature. In this setting, the source domain data are labelled, but with few-shot per…

Computer Vision and Pattern Recognition · Computer Science 2021-08-09 Shengqi Huang , Wanqi Yang , Lei Wang , Luping Zhou , Ming Yang

Geo-tagged images are publicly available in large quantities, whereas labels such as object classes are rather scarce and expensive to collect. Meanwhile, contrastive learning has achieved tremendous success in various natural image and…

Computer Vision and Pattern Recognition · Computer Science 2023-05-10 Gengchen Mai , Ni Lao , Yutong He , Jiaming Song , Stefano Ermon

Beyond the success of Contrastive Language-Image Pre-training (CLIP), recent trends mark a shift toward exploring the applicability of lightweight vision-language models for resource-constrained scenarios. These models often deliver…

Computer Vision and Pattern Recognition · Computer Science 2025-03-24 Chu Myaet Thwal , Ye Lin Tun , Minh N. H. Nguyen , Eui-Nam Huh , Choong Seon Hong

While few-shot learning (FSL) aims for rapid generalization to new concepts with little supervision, self-supervised learning (SSL) constructs supervisory signals directly computed from unlabeled data. Exploiting the complementarity of…

Computer Vision and Pattern Recognition · Computer Science 2021-04-20 Zhengyu Chen , Jixie Ge , Heshen Zhan , Siteng Huang , Donglin Wang

Federated Learning (FL) enables collaborative model training across decentralized clients without sharing private data. However, FL suffers from biased global models due to non-IID and long-tail data distributions. We propose…

Machine Learning · Computer Science 2026-01-08 Jingrui Zhang , Yimeng Xu , Shujie Li , Feng Liang , Haihan Duan , Yanjie Dong , Victor C. M. Leung , Xiping Hu