Search Results for author: Vassilis Christophides

Found 7 papers, 4 papers with code

A Meta-level Analysis of Online Anomaly Detectors

1 code implementation13 Sep 2022 Antonios Ntroumpogiannis, Michail Giannoulis, Nikolaos Myrtakis, Vassilis Christophides, Eric Simon, Ioannis Tsamardinos

The behavior of the detectors is correlated with the characteristics of different datasets (i. e., meta-features), thereby providing a meta-level analysis of their performance.

Knowledge Graph Embedding Methods for Entity Alignment: An Experimental Review

1 code implementation17 Mar 2022 Nikolaos Fanourakis, Vasilis Efthymiou, Dimitris Kotzinos, Vassilis Christophides

Recently, embedding methods have been used for entity alignment tasks, that learn a vector-space representation of entities which preserves their similarity in the original KGs.

Attribute Entity Alignment +3

FairER: Entity Resolution with Fairness Constraints

1 code implementation CIKM 2021 Vasilis Efthymiou, Kostas Stefanidis, Evaggelia Pitoura, Vassilis Christophides

One of the most critical tasks for improving data quality and increasing the reliability of data analytics is Entity Resolution (ER), which aims to identify different descriptions that refer to the same real-world entity.

Entity Resolution Fairness

On Predictive Explanation of Data Anomalies

no code implementations18 Oct 2021 Nikolaos Myrtakis, Ioannis Tsamardinos, Vassilis Christophides

PROTEUS is designed to return an accurate estimate of out-of-sample predictive performance to serve as a metric of the quality of the approximation.

AutoML Feature Importance +1

Matching Web Tables with Knowledge Base Entities: From Entity Lookups to Entity Embeddings

no code implementations The Semantic Web – ISWC 2017 Vasilis Efthymiou, Oktie Hassanzadeh, Mariano Rodriguez-Muro, Vassilis Christophides

Our results show that: (1) our novel lookup-based method outperforms state-of-the-art lookup-based methods, (2) the semantic embeddings method outperforms lookup-based methods in one benchmark data set, and (3) the lack of a rich schema in Web tables can limit the ability of ontology matching tools in performing high-quality table annotation.

Cell Entity Annotation Entity Embeddings +1

Massively-Parallel Feature Selection for Big Data

no code implementations23 Aug 2017 Ioannis Tsamardinos, Giorgos Borboudakis, Pavlos Katsogridakis, Polyvios Pratikakis, Vassilis Christophides

We present the Parallel, Forward-Backward with Pruning (PFBP) algorithm for feature selection (FS) in Big Data settings (high dimensionality and/or sample size).

feature selection

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