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One-class classification (OCC) algorithms aim to build classification models when the negative class is either absent, poorly sampled or not well defined. This unique situation constrains the learning of efficient classifiers by defining…

Machine Learning · Computer Science 2018-02-05 Shehroz S. Khan , Michael G. Madden

A desirable open world recognition (OWR) system requires performing three tasks: (1) Open set recognition (OSR), i.e., classifying the known (classes seen during training) and rejecting the unknown (unseen$/$novel classes) online; (2)…

Computer Vision and Pattern Recognition · Computer Science 2023-08-15 Fulin Gao , Weimin Zhong , Zhixing Cao , Xin Peng , Zhi Li

Recent advancements in open vocabulary models, like CLIP, have notably advanced zero-shot classification and segmentation by utilizing natural language for class-specific embeddings. However, most research has focused on improving model…

Computer Vision and Pattern Recognition · Computer Science 2024-04-02 Wenfang Sun , Yingjun Du , Gaowen Liu , Ramana Kompella , Cees G. M. Snoek

As an emerging and challenging problem in the computer vision community, weakly supervised object localization and detection plays an important role for developing new generation computer vision systems and has received significant…

Computer Vision and Pattern Recognition · Computer Science 2021-04-19 Dingwen Zhang , Junwei Han , Gong Cheng , Ming-Hsuan Yang

Hierarchical text classification has many real-world applications. However, labeling a large number of documents is costly. In practice, we can use semi-supervised learning or weakly supervised learning (e.g., dataless classification) to…

Machine Learning · Computer Science 2019-02-26 Huiru Xiao , Xin Liu , Yangqiu Song

Open-set classification is a problem of handling `unknown' classes that are not contained in the training dataset, whereas traditional classifiers assume that only known classes appear in the test environment. Existing open-set classifiers…

Computer Vision and Pattern Recognition · Computer Science 2019-10-08 Ryota Yoshihashi , Wen Shao , Rei Kawakami , Shaodi You , Makoto Iida , Takeshi Naemura

One-class classification (OCC), which models one single positive class and distinguishes it from the negative class, has been a long-standing topic with pivotal application to realms like anomaly detection. As modern society often deals…

Computer Vision and Pattern Recognition · Computer Science 2021-04-28 Siqi Wang , Jiyuan Liu , Guang Yu , Xinwang Liu , Sihang Zhou , En Zhu , Yuexiang Yang , Jianping Yin

Weakly supervised visual grounding (VG) aims to locate objects in images based on text descriptions. Despite significant progress, existing methods lack strong cross-modal reasoning to distinguish subtle semantic differences in text…

Computer Vision and Pattern Recognition · Computer Science 2025-10-28 Yidan Wang , Chenyi Zhuang , Wutao Liu , Pan Gao , Nicu Sebe

Text prompts are crucial for generalizing pre-trained open-set object detection models to new categories. However, current methods for text prompts are limited as they require manual feedback when generalizing to new categories, which…

Computer Vision and Pattern Recognition · Computer Science 2023-12-15 Qibo Chen , Weizhong Jin , Shuchang Li , Mengdi Liu , Li Yu , Jian Jiang , Xiaozheng Wang

Complex Word Identification (CWI) is a task centered on detecting hard-to-understand words, or groups of words, in texts from different areas of expertise. The purpose of CWI is to highlight problematic structures that non-native speakers…

Computation and Language · Computer Science 2020-10-05 George-Eduard Zaharia , Dumitru-Clementin Cercel , Mihai Dascalu

Few-shot learning aims to handle previously unseen tasks using only a small amount of new training data. In preparing (or meta-training) a few-shot learner, however, massive labeled data are necessary. In the real world, unfortunately,…

Machine Learning · Computer Science 2020-03-19 Jun Seo , Sung Whan Yoon , Jaekyun Moon

The Recurrent Neural Network-Transducer (RNN-T) is widely adopted in end-to-end (E2E) automatic speech recognition (ASR) tasks but depends heavily on large-scale, high-quality annotated data, which are often costly and difficult to obtain.…

Computation and Language · Computer Science 2025-11-07 Dongji Gao , Chenda Liao , Changliang Liu , Matthew Wiesner , Leibny Paola Garcia , Daniel Povey , Sanjeev Khudanpur , Jian Wu

In recent years, text classification methods based on neural networks and pre-trained models have gained increasing attention and demonstrated excellent performance. However, these methods still have some limitations in practical…

Computation and Language · Computer Science 2024-12-16 Yanxu Mao , Peipei Liu , Tiehan Cui , Congying Liu , Datao You

In this paper, a progressive learning technique for multi-class classification is proposed. This newly developed learning technique is independent of the number of class constraints and it can learn new classes while still retaining the…

Machine Learning · Computer Science 2017-01-24 Rajasekar Venkatesan , Meng Joo Er

In many real-world applications, the frequency distribution of class labels for training data can exhibit a long-tailed distribution, which challenges traditional approaches of training deep neural networks that require heavy amounts of…

Computer Vision and Pattern Recognition · Computer Science 2024-09-06 Richard Franklin , Jiawei Yao , Deyang Zhong , Qi Qian , Juhua Hu

Existing machine-generated text (MGT) detection methods implicitly assume labels as the "golden standard". However, we reveal boundary ambiguity in MGT detection, implying that traditional training paradigms are inexact. Moreover,…

Computation and Language · Computer Science 2025-11-04 Chenwang Wu , Yiu-ming Cheung , Bo Han , Defu Lian

We present a new approach, called meta-meta classification, to learning in small-data settings. In this approach, one uses a large set of learning problems to design an ensemble of learners, where each learner has high bias and low variance…

Machine Learning · Computer Science 2020-06-16 Arkabandhu Chowdhury , Dipak Chaudhari , Swarat Chaudhuri , Chris Jermaine

This paper concerns open-world classification, where the classifier not only needs to classify test examples into seen classes that have appeared in training but also reject examples from unseen or novel classes that have not appeared in…

Machine Learning · Computer Science 2018-01-18 Lei Shu , Hu Xu , Bing Liu

We study Label Smoothing (LS), a widely used regularization technique, in the context of neural learning to rank (L2R) models. LS combines the ground-truth labels with a uniform distribution, encouraging the model to be less confident in…

Information Retrieval · Computer Science 2020-12-17 Gustavo Penha , Claudia Hauff

Recently, Vision-Language Pre-training (VLP) techniques have greatly benefited various vision-language tasks by jointly learning visual and textual representations, which intuitively helps in Optical Character Recognition (OCR) tasks due to…

Computer Vision and Pattern Recognition · Computer Science 2022-11-15 Chuhui Xue , Wenqing Zhang , Yu Hao , Shijian Lu , Philip Torr , Song Bai