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Novel Class Discovery (NCD) is a growing field where we are given during training a labeled set of known classes and an unlabeled set of different classes that must be discovered. In recent years, many methods have been proposed to address…

Novel class discovery (NCD) aims to infer novel categories in an unlabeled dataset leveraging prior knowledge of a labeled set comprising disjoint but related classes. Existing research focuses primarily on utilizing the labeled set at the…

Computer Vision and Pattern Recognition · Computer Science 2023-01-30 Ziyun Li , Jona Otholt , Ben Dai , Di hu , Christoph Meinel , Haojin Yang

The problem of Novel Class Discovery (NCD) consists in extracting knowledge from a labeled set of known classes to accurately partition an unlabeled set of novel classes. While NCD has recently received a lot of attention from the…

Machine Learning · Computer Science 2024-06-04 Colin Troisemaine , Alexandre Reiffers-Masson , Stéphane Gosselin , Vincent Lemaire , Sandrine Vaton

Novel Class Discovery (NCD) is the problem of trying to discover novel classes in an unlabeled set, given a labeled set of different but related classes. The majority of NCD methods proposed so far only deal with image data, despite tabular…

Novel Class Discovery (NCD) involves identifying new categories within unlabeled data by utilizing knowledge acquired from previously established categories. However, existing NCD methods often struggle to maintain a balance between the…

Machine Learning · Computer Science 2024-07-26 Yue Hou , Xueyuan Chen , He Zhu , Romei Liu , Bowen Shi , Jiaheng Liu , Junran Wu , Ke Xu

Novel Class Discovery (NCD) aims at inferring novel classes in an unlabeled set by leveraging prior knowledge from a labeled set with known classes. Despite its importance, there is a lack of theoretical foundations for NCD. This paper…

Machine Learning · Computer Science 2023-08-10 Yiyou Sun , Zhenmei Shi , Yingyu Liang , Yixuan Li

In this paper, we address Novel Class Discovery (NCD), the task of unveiling new classes in a set of unlabeled samples given a labeled dataset with known classes. We exploit the peculiarities of NCD to build a new framework, named…

Computer Vision and Pattern Recognition · Computer Science 2021-06-22 Zhun Zhong , Enrico Fini , Subhankar Roy , Zhiming Luo , Elisa Ricci , Nicu Sebe

In this paper, we consider a real-world scenario where a model that is trained on pre-defined classes continually encounters unlabeled data that contains both known and novel classes. The goal is to continually discover novel classes while…

Computer Vision and Pattern Recognition · Computer Science 2023-10-19 Yanan Wu , Zhixiang Chi , Yang Wang , Songhe Feng

In Novel Class Discovery (NCD), the goal is to find new classes in an unlabeled set given a labeled set of known but different classes. While NCD has recently gained attention from the community, no framework has yet been proposed for…

In Novel Class Discovery (NCD), the goal is to find new classes in an unlabeled set given a labeled set of known but different classes. While NCD has recently gained attention from the community, no framework has yet been proposed for…

In this paper, we address the problem of novel class discovery (NCD), which aims to cluster novel classes by leveraging knowledge from disjoint known classes. While recent advances have made significant progress in this area, existing NCD…

Computer Vision and Pattern Recognition · Computer Science 2025-07-17 Xinhang Wan , Jiyuan Liu , Qian Qu , Suyuan Liu , Chuyu Zhang , Fangdi Wang , Xinwang Liu , En Zhu , Kunlun He

In this paper, we study the problem of Novel Class Discovery (NCD). NCD aims at inferring novel object categories in an unlabeled set by leveraging from prior knowledge of a labeled set containing different, but related classes. Existing…

Computer Vision and Pattern Recognition · Computer Science 2021-09-30 Enrico Fini , Enver Sangineto , Stéphane Lathuilière , Zhun Zhong , Moin Nabi , Elisa Ricci

Novel Class Discovery aims to utilise prior knowledge of known classes to classify and discover unknown classes from unlabelled data. Existing NCD methods for images primarily rely on visual features, which suffer from limitations such as…

Computer Vision and Pattern Recognition · Computer Science 2025-12-12 Yuetong Su , Baoguo Wei , Xinyu Wang , Xu Li , Lixin Li

Novel Class Discovery (NCD) is a learning paradigm, where a machine learning model is tasked to semantically group instances from unlabeled data, by utilizing labeled instances from a disjoint set of classes. In this work, we first…

Computer Vision and Pattern Recognition · Computer Science 2022-04-25 K J Joseph , Sujoy Paul , Gaurav Aggarwal , Soma Biswas , Piyush Rai , Kai Han , Vineeth N Balasubramanian

Novel Categories Discovery (NCD) aims to cluster novel data based on the class semantics of known classes using the open-world partial class space annotated dataset. As an alternative to the traditional pseudo-labeling-based approaches, we…

Computer Vision and Pattern Recognition · Computer Science 2023-12-19 Zahid Hasan , Abu Zaher Md Faridee , Masud Ahmed , Sanjay Purushotham , Heesung Kwon , Hyungtae Lee , Nirmalya Roy

We study the new task of class-incremental Novel Class Discovery (class-iNCD), which refers to the problem of discovering novel categories in an unlabelled data set by leveraging a pre-trained model that has been trained on a labelled data…

Computer Vision and Pattern Recognition · Computer Science 2022-07-19 Subhankar Roy , Mingxuan Liu , Zhun Zhong , Nicu Sebe , Elisa Ricci

Novel class discovery (NCD) aims at learning a model that transfers the common knowledge from a class-disjoint labelled dataset to another unlabelled dataset and discovers new classes (clusters) within it. Many methods, as well as elaborate…

Computer Vision and Pattern Recognition · Computer Science 2023-03-24 Wenbin Li , Zhichen Fan , Jing Huo , Yang Gao

We tackle the problem of discovering novel classes in an image collection given labelled examples of other classes. This setting is similar to semi-supervised learning, but significantly harder because there are no labelled examples for the…

Computer Vision and Pattern Recognition · Computer Science 2020-02-14 Kai Han , Sylvestre-Alvise Rebuffi , Sebastien Ehrhardt , Andrea Vedaldi , Andrew Zisserman

Generalized Class Discovery (GCD) aims to dynamically assign labels to unlabelled data partially based on knowledge learned from labelled data, where the unlabelled data may come from known or novel classes. The prevailing approach…

Machine Learning · Computer Science 2024-05-01 Ye Wang , Yaxiong Wang , Yujiao Wu , Bingchen Zhao , Xueming Qian

Category discovery (CD) is an emerging open-world learning task, which aims at automatically categorizing unlabelled data containing instances from unseen classes, given some labelled data from seen classes. This task has attracted…

Computer Vision and Pattern Recognition · Computer Science 2025-09-30 Zhenqi He , Yuanpei Liu , Kai Han
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