no code implementations • 3 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.
no code implementations • 27 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.
no code implementations • 27 Mar 2023 • Sofia Yfantidou, Marios Constantinides, Dimitris Spathis, Athena Vakali, Daniele Quercia, Fahim Kawsar
The field of mobile and wearable computing is undergoing a revolutionary integration of machine learning.
1 code implementation • 30 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.
no code implementations • 4 Nov 2022 • Sofia Rizou, Antonia Paflioti, Angelos Theofilatos, Athena Vakali, George Sarigiannidis, Konstantinos Ch. Chatzisavvas
Named Entity Recognition and Intent Classification are among the most important subfields of the field of Natural Language Processing.
no code implementations • 6 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.
1 code implementation • 22 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.
no code implementations • 20 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).
no code implementations • 1 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.
7 code implementations • 1 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
no code implementations • WS 2017 • Joan Serr{\`a}, Ilias Leontiadis, Dimitris Spathis, Gianluca Stringhini, Jeremy Blackburn, Athena Vakali
Common approaches to text categorization essentially rely either on n-gram counts or on word embeddings.
no code implementations • 24 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.
1 code implementation • 22 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
1 code implementation • 5 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