Search Results for author: Athena Vakali

Found 14 papers, 5 papers with code

Evaluating Fairness in Self-supervised and Supervised Models for Sequential Data

no code implementations3 Jan 2024 Sofia Yfantidou, Dimitris Spathis, Marios Constantinides, Athena Vakali, Daniele Quercia, Fahim Kawsar

Self-supervised learning (SSL) has become the de facto training paradigm of large models where pre-training is followed by supervised fine-tuning using domain-specific data and labels.

Fairness Self-Supervised Learning

Uncovering Bias in Personal Informatics

no code implementations27 Mar 2023 Sofia Yfantidou, Pavlos Sermpezis, Athena Vakali, Ricardo Baeza-Yates

Personal informatics (PI) systems, powered by smartphones and wearables, enable people to lead healthier lifestyles by providing meaningful and actionable insights that break down barriers between users and their health information.

UBIWEAR: An end-to-end, data-driven framework for intelligent physical activity prediction to empower mHealth interventions

1 code implementation30 Dec 2022 Asterios Bampakis, Sofia Yfantidou, Athena Vakali

To this end, we propose UBIWEAR, an end-to-end framework for intelligent physical activity prediction, with the ultimate goal to empower data-driven goal-setting interventions.

Activity Prediction

Pointspectrum: Equivariance Meets Laplacian Filtering for Graph Representation Learning

no code implementations6 Sep 2021 Marinos Poiitis, Pavlos Sermpezis, Athena Vakali

In a different GRL approach, spectral methods based on graph filtering have emerged addressing over smoothing; however, up to now, they employ traditional neural networks that cannot efficiently exploit the structure of graph data.

Graph Representation Learning

My tweets bring all the traits to the yard: Predicting personality and relational traits in Online Social Networks

1 code implementation22 Sep 2020 Dimitra Karanatsiou, Pavlos Sermpezis, Jon Gruda, Konstantinos Kafetsios, Ilias Dimitriadis, Athena Vakali

Despite a marked increase on research in personality prediction on based on online behavior the focus has been heavily on individual personality traits largely neglecting relational facets of personality.

Feature Engineering Marketing

Detecting Cyberbullying and Cyberaggression in Social Media

no code implementations20 Jul 2019 Despoina Chatzakou, Ilias Leontiadis, Jeremy Blackburn, Emiliano De Cristofaro, Gianluca Stringhini, Athena Vakali, Nicolas Kourtellis

We also explore specific manifestations of abusive behavior, i. e., cyberbullying and cyberaggression, in one of the hate-related communities (Gamergate).

A Unified Deep Learning Architecture for Abuse Detection

no code implementations1 Feb 2018 Antigoni-Maria Founta, Despoina Chatzakou, Nicolas Kourtellis, Jeremy Blackburn, Athena Vakali, Ilias Leontiadis

Hate speech, offensive language, sexism, racism and other types of abusive behavior have become a common phenomenon in many online social media platforms.

Abuse Detection Blocking

Large Scale Crowdsourcing and Characterization of Twitter Abusive Behavior

7 code implementations1 Feb 2018 Antigoni-Maria Founta, Constantinos Djouvas, Despoina Chatzakou, Ilias Leontiadis, Jeremy Blackburn, Gianluca Stringhini, Athena Vakali, Michael Sirivianos, Nicolas Kourtellis

In recent years, offensive, abusive and hateful language, sexism, racism and other types of aggressive and cyberbullying behavior have been manifesting with increased frequency, and in many online social media platforms.

Social and Information Networks 68T06 K.4.2

Measuring #GamerGate: A Tale of Hate, Sexism, and Bullying

no code implementations24 Feb 2017 Despoina Chatzakou, Nicolas Kourtellis, Jeremy Blackburn, Emiliano De Cristofaro, Gianluca Stringhini, Athena Vakali

Over the past few years, online aggression and abusive behaviors have occurred in many different forms and on a variety of platforms.

Mean Birds: Detecting Aggression and Bullying on Twitter

1 code implementation22 Feb 2017 Despoina Chatzakou, Nicolas Kourtellis, Jeremy Blackburn, Emiliano De Cristofaro, Gianluca Stringhini, Athena Vakali

In recent years, bullying and aggression against users on social media have grown significantly, causing serious consequences to victims of all demographics.

Computers and Society Social and Information Networks

Bridge Bounding: A Local Approach for Efficient Community Discovery in Complex Networks

1 code implementation5 Feb 2009 Symeon Papadopoulos, Andre Skusa, Athena Vakali, Yiannis Kompatsiaris, Nadine Wagner

There are numerous techniques adopting a global perspective to the community detection problem, i. e. they operate on the complete network structure, thus being computationally expensive and hard to apply in a streaming manner.

Data Analysis, Statistics and Probability Physics and Society

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