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Anomaly detection is a challenging task and usually formulated as an one-class learning problem for the unexpectedness of anomalies. This paper proposes a simple yet powerful approach to this issue, which is implemented in the…

Computer Vision and Pattern Recognition · Computer Science 2021-10-29 Guodong Wang , Shumin Han , Errui Ding , Di Huang

Dense retrieval techniques employ pre-trained large language models to build a high-dimensional representation of queries and passages. These representations compute the relevance of a passage w.r.t. to a query using efficient similarity…

Information Retrieval · Computer Science 2024-04-04 Franco Maria Nardini , Cosimo Rulli , Rossano Venturini

Information retrieval involves selecting artifacts from a corpus that are most relevant to a given search query. The flavor of retrieval typically used in classical applications can be termed as homogeneous and relaxed, where queries and…

Information Retrieval · Computer Science 2023-10-10 Anirudh Khatry , Yasharth Bajpai , Priyanshu Gupta , Sumit Gulwani , Ashish Tiwari

Databases employ indexes to filter out irrelevant records, which reduces scan overhead and speeds up query execution. However, this optimization is only available to queries that filter on the indexed attribute. To extend these speedups to…

Databases · Computer Science 2020-12-15 Vikram Nathan , Jialin Ding , Tim Kraska , Mohammad Alizadeh

We address the problem of retrieving relevant experiments given a query experiment, motivated by the public databases of datasets in molecular biology and other experimental sciences, and the need of scientists to relate to earlier work on…

Machine Learning · Statistics 2014-03-10 Ritabrata Dutta , Sohan Seth , Samuel Kaski

The task of detecting anomalous data patterns is as important in practical applications as challenging. In the context of spatial data, recognition of unexpected trajectories brings additional difficulties, such as high dimensionality and…

Quantization based techniques are the current state-of-the-art for scaling maximum inner product search to massive databases. Traditional approaches to quantization aim to minimize the reconstruction error of the database points. Based on…

Machine Learning · Computer Science 2020-12-08 Ruiqi Guo , Philip Sun , Erik Lindgren , Quan Geng , David Simcha , Felix Chern , Sanjiv Kumar

Anomaly detection plays a crucial role in various domains, from cybersecurity to industrial systems. However, traditional centralized approaches often encounter challenges related to data privacy. In this context, Federated Learning emerges…

Machine Learning · Computer Science 2024-07-08 Massimo Frasson , Dario Malchiodi

In the age of social computing, finding interesting network patterns or motifs is significant and critical for various areas such as decision intelligence, intrusion detection, medical diagnosis, social network analysis, fake news…

Social and Information Networks · Computer Science 2022-04-07 Shuo Yu , Feng Xia , Yuchen Sun , Tao Tang , Xiaoran Yan , Ivan Lee

In this vision paper, we propose a shift in perspective for improving the effectiveness of similarity search. Rather than focusing solely on enhancing the data quality, particularly machine learning-generated embeddings, we advocate for a…

Databases · Computer Science 2023-08-03 Renzhi Wu , Jingfan Meng , Jie Jeff Xu , Huayi Wang , Kexin Rong

The problem of recovering a vector from the absolute values of its inner products against a family of measurement vectors has been well studied in mathematics and engineering. A generalization of this phase retrieval problem also exists in…

Functional Analysis · Mathematics 2013-07-19 Jameson Cahill , Peter G. Casazza , Jesse Peterson , Lindsey Woodland

Embedding models can generate high-dimensional vectors whose similarity reflects semantic affinities. Thus, accurately and timely retrieving those vectors in a large collection that are similar to a given query has become a critical…

Information Retrieval · Computer Science 2024-10-31 Mariano Tepper , Ishwar Singh Bhati , Cecilia Aguerrebere , Ted Willke

Quantum one-class support vector machines leverage the advantage of quantum kernel methods for semi-supervised anomaly detection. However, their quadratic time complexity with respect to data size poses challenges when dealing with large…

We address the task of ranking objects (such as people, blogs, or verticals) that, unlike documents, do not have direct term-based representations. To be able to match them against keyword queries, evidence needs to be amassed from…

Information Retrieval · Computer Science 2017-08-30 Shuo Zhang , Krisztian Balog

We propose a novel concept of asymmetric feature maps (AFM), which allows to evaluate multiple kernels between a query and database entries without increasing the memory requirements. To demonstrate the advantages of the AFM method, we…

Computer Vision and Pattern Recognition · Computer Science 2017-04-14 Giorgos Tolias , Ondřej Chum

Given a query photo issued by a user (q-user), the landmark retrieval is to return a set of photos with their landmarks similar to those of the query, while the existing studies on the landmark retrieval focus on exploiting geometries of…

Computer Vision and Pattern Recognition · Computer Science 2017-04-05 Yang Wang , Xuemin Lin , Lin Wu , Wenjie Zhang

Universal multimodal embedding models have achieved great success in capturing semantic relevance between queries and candidates. However, current methods either condense queries and candidates into a single vector, potentially limiting the…

Information Retrieval · Computer Science 2026-04-08 Zilin Xiao , Qi Ma , Mengting Gu , Chun-cheng Jason Chen , Xintao Chen , Vicente Ordonez , Vijai Mohan

The rapid growth of user-generated videos on the Internet has intensified the need for text-based video retrieval systems. Traditional methods mainly favor the concept-based paradigm on retrieval with simple queries, which are usually…

Computer Vision and Pattern Recognition · Computer Science 2020-07-07 Xun Yang , Jianfeng Dong , Yixin Cao , Xun Wang , Meng Wang , Tat-Seng Chua

Vector set search, an underexplored similarity search paradigm, aims to find vector sets similar to a query set. This search paradigm leverages the inherent structural alignment between sets and real-world entities to model more…

Databases · Computer Science 2025-07-08 Yiqi Li , Sheng Wang , Zhiyu Chen , Shangfeng Chen , Zhiyong Peng

Pattern spotting consists of searching in a collection of historical document images for occurrences of a graphical object using an image query. Contrary to object detection, no prior information nor predefined class is given about the…

Computer Vision and Pattern Recognition · Computer Science 2019-06-21 Ignacio Úbeda , Jose M. Saavedra , Stéphane Nicolas , Caroline Petitjean , Laurent Heutte