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Kuaishou serving hundreds of millions of searches daily, the quality of short-video search is paramount. However, it suffers from a severe Matthew effect on long-tail queries: sparse user behavior data causes models to amplify low-quality…

Information Retrieval · Computer Science 2026-03-31 Wenyi Xu , Feiran Zhu , Songyang Li , Renzhe Zhou , Chao Zhang , Chenglei Dai , Yuren Mao , Yunjun Gao , Yi Zhang

The standard way of training video models entails sampling at each iteration a single clip from a video and optimizing the clip prediction with respect to the video-level label. We argue that a single clip may not have enough temporal…

Computer Vision and Pattern Recognition · Computer Science 2021-04-06 Xitong Yang , Haoqi Fan , Lorenzo Torresani , Larry Davis , Heng Wang

Real-world data universally confronts a severe class-imbalance problem and exhibits a long-tailed distribution, i.e., most labels are associated with limited instances. The na\"ive models supervised by such datasets would prefer dominant…

Computer Vision and Pattern Recognition · Computer Science 2021-11-09 Zhengzhuo Xu , Zenghao Chai , Chun Yuan

Data is the foundation for the development of computer vision, and the establishment of datasets plays an important role in advancing the techniques of fine-grained visual categorization~(FGVC). In the existing FGVC datasets used in…

Computer Vision and Pattern Recognition · Computer Science 2024-11-12 Shuo Ye , Shiming Chen , Ruxin Wang , Tianxu Wu , Jiamiao Xu , Salman Khan , Fahad Shahbaz Khan , Ling Shao

Existing large video-language models (LVLMs) struggle to comprehend long videos correctly due to limited context. To address this problem, fine-tuning long-context LVLMs and employing GPT-based agents have emerged as promising solutions.…

Computer Vision and Pattern Recognition · Computer Science 2025-11-25 Yongdong Luo , Xiawu Zheng , Guilin Li , Shukang Yin , Haojia Lin , Chaoyou Fu , Jinfa Huang , Jiayi Ji , Fei Chao , Jiebo Luo , Rongrong Ji

Long-tailed (LT) classification is an unavoidable and challenging problem in the real world. Most existing long-tailed classification methods focus only on solving the class-wise imbalance while ignoring the attribute-wise imbalance. The…

Computer Vision and Pattern Recognition · Computer Science 2024-08-16 Jinye Yang , Ji Xu , Di Wu , Jianhang Tang , Shaobo Li , Guoyin Wang

Long video understanding poses a significant challenge for current Multi-modal Large Language Models (MLLMs). Notably, the MLLMs are constrained by their limited context lengths and the substantial costs while processing long videos.…

Computer Vision and Pattern Recognition · Computer Science 2024-12-11 Yan Shu , Zheng Liu , Peitian Zhang , Minghao Qin , Junjie Zhou , Zhengyang Liang , Tiejun Huang , Bo Zhao

Contemporary autonomous vehicle (AV) benchmarks have advanced techniques for training 3D detectors. While class labels naturally follow a long-tailed distribution in the real world, existing benchmarks only focus on a few common classes…

Computer Vision and Pattern Recognition · Computer Science 2025-09-16 Yechi Ma , Neehar Peri , Achal Dave , Wei Hua , Deva Ramanan , Shu Kong

Videos have become ubiquitous on the Internet. And video analysis can provide lots of information for detecting and recognizing objects as well as help people understand human actions and interactions with the real world. However, facing…

Computer Vision and Pattern Recognition · Computer Science 2018-12-03 Tianqi Zhao

Multi-modal Large language models (MLLMs) show remarkable ability in video understanding. Nevertheless, understanding long videos remains challenging as the models can only process a finite number of frames in a single inference,…

Computer Vision and Pattern Recognition · Computer Science 2025-03-27 Yucheng Suo , Fan Ma , Linchao Zhu , Tianyi Wang , Fengyun Rao , Yi Yang

Real-world data often follow a long-tailed distribution with a high imbalance in the number of samples between classes. The problem with training from imbalanced data is that some background features, common to all classes, can be…

Computer Vision and Pattern Recognition · Computer Science 2024-06-05 Sanglee Park , Seung-won Hwang , Jungmin So

The visual world naturally exhibits an imbalance in the number of object or scene instances resulting in a \emph{long-tailed distribution}. This imbalance poses significant challenges for classification models based on deep learning.…

Computer Vision and Pattern Recognition · Computer Science 2021-11-12 Rahul Vigneswaran , Marc T. Law , Vineeth N. Balasubramanian , Makarand Tapaswi

Video-based large language models (Video-LLMs) have been recently introduced, targeting both fundamental improvements in perception and comprehension, and a diverse range of user inquiries. In pursuit of the ultimate goal of achieving…

Computer Vision and Pattern Recognition · Computer Science 2023-11-29 Munan Ning , Bin Zhu , Yujia Xie , Bin Lin , Jiaxi Cui , Lu Yuan , Dongdong Chen , Li Yuan

As the scale of data and models for video understanding rapidly expand, handling long-form video input in transformer-based models presents a practical challenge. Rather than resorting to input sampling or token dropping, which may result…

Computer Vision and Pattern Recognition · Computer Science 2024-11-01 Seon-Ho Lee , Jue Wang , Zhikang Zhang , David Fan , Xinyu Li

Training a model for food recognition is challenging because the training samples, which are typically crawled from the Internet, are visually different from the pictures captured by users in the free-living environment. In addition to this…

Computer Vision and Pattern Recognition · Computer Science 2025-11-21 Qing Wang , Chong-Wah Ngo , Ee-Peng Lim , Qianru Sun

Long-tailed data is prevalent in real-world classification tasks and heavily relies on supervised information, which makes the annotation process exceptionally labor-intensive and time-consuming. Unfortunately, despite being a common…

Machine Learning · Computer Science 2024-12-04 Meng Wei , Zhongnian Li , Yong Zhou , Xinzheng Xu

In the real open world, data tends to follow long-tailed class distributions, motivating the well-studied long-tailed recognition (LTR) problem. Naive training produces models that are biased toward common classes in terms of higher…

Computer Vision and Pattern Recognition · Computer Science 2022-03-29 Shaden Alshammari , Yu-Xiong Wang , Deva Ramanan , Shu Kong

Video understanding, including video captioning and retrieval, is still a great challenge for video-language models (VLMs). The existing video retrieval and caption benchmarks only include short descriptions, limits their ability of…

Computer Vision and Pattern Recognition · Computer Science 2025-03-19 Yifan Xu , Xinhao Li , Yichun Yang , Desen Meng , Rui Huang , Limin Wang

Long-tail recognition is challenging because it requires the model to learn good representations from tail categories and address imbalances across all categories. In this paper, we propose a novel generative and fine-tuning framework,…

Computer Vision and Pattern Recognition · Computer Science 2024-05-28 Qihao Zhao , Yalun Dai , Hao Li , Wei Hu , Fan Zhang , Jun Liu

The advent of large vision-language models (LVLMs) has spurred research into their applications in multi-modal contexts, particularly in video understanding. Traditional VideoQA benchmarks, despite providing quantitative metrics, often fail…

Computer Vision and Pattern Recognition · Computer Science 2024-10-31 Xinyu Fang , Kangrui Mao , Haodong Duan , Xiangyu Zhao , Yining Li , Dahua Lin , Kai Chen