publications

Please also see Google Scholar for an updated list.


2026

PolySAE: Modeling Feature Interactions in Sparse Autoencoders via Polynomial Decoding
P. Koromilas, A. D. Demou, J. Oldfield, Y. Panagakis, M. A. Nicolaou
International Conference on Machine Learning (ICML)
Neural Collapse by Design: Learning Class Prototypes on the Hypersphere
P. Koromilas, T. Giannakopoulos, M. A. Nicolaou, Y. Panagakis
International Conference on Machine Learning (ICML)
Interpretable Music Harmonic Analysis Through Multilinear Mixture of Experts
T. Triantafyllou, M. A. Nicolaou, Y. Panagakis
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Disentangling Local and Global Semantics in Diffusion Models for Image Editing
M. Plitsis, T. Kouzelis, P. Koromilas, V. Katsouros, M. A. Nicolaou, Y. Panagakis
International Journal of Computer Vision (IJCV)
Artificial Intelligence-Based Heliostat Characterisation Through Synthetic Data
J. Moreno García-Moreno, K. Milidonis, G. Kourmouli, M. A. Nicolaou
Engineering Applications of Artificial Intelligence

2025

Towards Interpretability Without Sacrifice: Faithful Dense Layer Decomposition with Mixture of Decoders
J. Oldfield, S. Im, Y. Li, M. A. Nicolaou, I. Patras, G. G. Chrysos
Advances in Neural Information Processing Systems (NeurIPS)
Rethinking Objectives for Multi-View and Multi-Modal Contrastive Learning
P. Koromilas, E. Georgiou, G. Bouritsas, T. Giannakopoulos, M. A. Nicolaou, Y. Panagakis
UniReps Workshop, Advances in Neural Information Processing Systems (NeurIPS)
Global high-resolution ultrafine particle number concentrations through data fusion with machine learning
P. Georgiades, M. Kohl, M. A. Nicolaou, T. Christoudias, A. Pozzer, C. Dovrolis, J. Lelieveld
Scientific Data
Artificial intelligence-aided generative design of non-imaging secondary reflector for linear Fresnel concentrating collector
J. M. García-Moreno, A. C. Montenon, M. A. Nicolaou, W. Lipiński, K. Milidonis
Solar Energy
Immersed boundary–lattice Boltzmann mesoscale method for wetting problems
E. Bellantoni, F. Guglietta, F. Pelusi, M. Desbrun, K. Um, M. A. Nicolaou, N. Savva, M. Sbragaglia
Physical Review E

2024

Multilinear Mixture of Experts: Scalable Expert Specialization through Factorization
J. Oldfield, M. Georgopoulos, G. G. Chrysos, C. Tzelepis, Y. Panagakis, M. A. Nicolaou, J. Deng, I. Patras
Advances in Neural Information Processing Systems (NeurIPS)
Enabling Local Editing in Diffusion Models by Joint and Individual Component Analysis
T. Kouzelis, M. Plitsis, M. A. Nicolaou, Y. Panagakis
British Machine Vision Conference (BMVC)
Bridging the gap between mini-batch and asymptotic analysis in contrastive learning: From InfoNCE to Kernel-based losses
P. Koromilas, G. Bouritsas, M. A. Nicolaou, Y. Panagakis
International Conference on Machine Learning (ICML)
Bilinear Models of Parts and Appearances in Generative Adversarial Networks
J. Oldfield, C. Tzelepis, M. A. Nicolaou, Y. Panagakis, I. Patras
IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)
Tensor Methods in Deep Learning
Y. Panagakis, J. Kossaifi, G. Chrysos, J. Oldfield, M. A. Nicolaou, S. Zafeiriou, A. Anandkumar
Signal Processing and Machine Learning Theory, Elsevier (book chapter)

2023

Parts of Speech-Grounded Subspaces in Vision-Language Models
J. Oldfield, C. Tzelepis, M. A. Nicolaou, Y. Panagakis, I. Patras
Advances in Neural Information Processing Systems (NeurIPS)
PandA: Unsupervised Learning of Parts and Appearances in the Feature Maps of GANs
J. Oldfield, C. Tzelepis, M. A. Nicolaou, Y. Panagakis, I. Patras
International Conference on Learning Representations (ICLR)
Multimodal Prediction of Alexithymia from Physiological and Audio Signals
V. Filippou, N. Theodosiou, M. A. Nicolaou, G. Panagiotou, et al.
International Conference on Affective Computing and Intelligent Interaction (ACII)
Locality-preserving Directions: Interpreting the Latent Space of Satellite Image GANs
G. Kourmouli, N. Kostagiolas, M. A. Nicolaou, Y. Panagakis
IEEE Geoscience and Remote Sensing Letters (GRSL)
Towards Explainable and Transferable Deep Downscaling of Atmospheric Pollutants
G. Ashiotis, P. Georgiades, T. Christoudias, M. A. Nicolaou
IEEE Geoscience and Remote Sensing Letters (GRSL)

2022

MMATR: Lightweight Tensor-based Regression for Multimodal Sentiment Analysis
P. Koromilas, T. Giannakopoulos, M. A. Nicolaou, Y. Panagakis
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
AI for Air Quality: Leveraging Data Fusion for Deep Downscaling of Atmospheric Pollutants
G. Ashiotis, E. Tsigkanos, T. Christoudias, M. A. Nicolaou
Machine Learning for Earth Observation Workshop (MACLEAN), ECML/PKDD — Best Paper Award
Efficient Learning of Multiple NLP Tasks via Collective Weight Factorization on BERT
C. Papadopoulos, Y. Panagakis, M. Koubarakis, M. A. Nicolaou
North American Chapter of the Association for Computational Linguistics (NAACL)
A Wavelet-based Approach for Predicting Alexithymia from Physiological Signals
V. Filippou, N. Theodosiou, M. A. Nicolaou, G. Panagiotou
International Conference on Affective Computing and Intelligent Interaction (ACII)
Unsupervised Discovery of Semantic Concepts in Satellite Imagery with Style-based Wavelet-driven Generative Models
N. Kostagiolas, M. A. Nicolaou, Y. Panagakis
12th Hellenic Conference on Artificial Intelligence (SETN)
Deep Learning on the Sphere for Multi-model Ensembling of Significant Wave Height
A. Littardi, A. Hildeman, M. A. Nicolaou
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Tensor Component Analysis for Interpreting the Latent Space of GANs
J. Oldfield, M. A. Nicolaou, Y. Panagakis, I. Patras
British Machine Vision Conference (BMVC) — oral
Autohighlight: Highlight Detection in League of Legends Esports Broadcasts via Crowd-Sourced Data
C. Ringer, M. A. Nicolaou, J. Walker
Machine Learning with Applications (MLWA)
Deep convolutional neural networks for generating atomistic configurations of multi-component macromolecules from coarse-grained models
E. Christofi, A. Chazirakis, C. Chrysostomou, M. A. Nicolaou, W. Li, M. Doxastakis, V. Harmandaris
The Journal of Chemical Physics
Adversarial Learning of Disentangled and Generalizable Representations for Visual Attributes
J. Oldfield, Y. Panagakis, M. A. Nicolaou
IEEE Transactions on Neural Networks and Learning Systems (TNNLS)

2021

Flow-based generative models for simulating the quantum harmonic and anharmonic oscillator
C. Alexandrou, G. Koutsou, S. Athanasiou, M. A. Nicolaou, S. Paul
Conference on Multiscale Physical and Biological Systems (STIMULATE) — Best Poster Award
Classification of Influenza Hemagglutinin Protein Sequences using Convolutional Neural Networks
C. Chrysostomou, F. Alexandrou, M. A. Nicolaou, H. Seker
43rd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC)
Shared-space Autoencoders with Randomized Skip Connections for Building Footprint Detection with Missing Views
G. Ashiotis, J. Oldfield, C. Chrysostomou, T. Christoudias, M. A. Nicolaou
25th International Conference on Pattern Recognition (ICPR) Workshops — oral
Tensor Methods in Computer Vision and Deep Learning
Y. Panagakis, J. Kossaifi, G. Chrysos, J. Oldfield, M. A. Nicolaou, S. Zafeiriou, A. Anandkumar
Proceedings of the IEEE
Mitigating Demographic Dataset Bias with Style-Based Attribute Transfer
M. Georgopoulos, J. Oldfield, M. A. Nicolaou, Y. Panagakis, M. Pantic
International Journal of Computer Vision (IJCV)

2020

Machine Learning towards a Global Parameterisation of Atmospheric New Particle Formation and Growth
T. Christoudias, M. A. Nicolaou
Tackling Climate Change with Machine Learning Workshop, NeurIPS
TwitchChat: A Dataset for Exploring Livestream Chat
C. Ringer, M. A. Nicolaou, J. A. Walker
16th AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment (AIIDE)
Multimodel Superensembling Using Convolutional Neural Networks
E. Larsson, A. Littardi, M. A. Nicolaou, L. Eriksson, W. Qazi
Swedish Artificial Intelligence Society Workshop (SAIS) — oral
Enhancing Facial Data Diversity with Style-based Ageing
M. Georgopoulos, J. Oldfield, M. A. Nicolaou, Y. Panagakis, M. Pantic
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops — oral
3DFaceGAN: Adversarial Nets for 3D Face Representation, Generation, and Translation
S. Moschoglou, S. Ploumpis, M. A. Nicolaou, S. Zafeiriou
International Journal of Computer Vision (IJCV)

2019

Streaming Behaviour: Livestreaming as a Paradigm for Analysis of Emotional and Social Signals
C. Ringer, M. A. Nicolaou
International Conference on Affective Computing and Intelligent Interaction Workshops (ACII-W)
Detecting Early Parkinson’s Disease from Keystroke Dynamics using the Tensor-Train Decomposition
H. Oroojeni, J. Oldfield, M. A. Nicolaou
27th European Signal Processing Conference (EUSIPCO)
Multimodal Joint Emotion and Game Context Recognition in League of Legends Livestreams
C. Ringer, J. A. Walker, M. A. Nicolaou
14th IEEE International Conference on Games (CoG) — oral
Time-series Clustering with Jointly Learning Deep Representations, Clusters and Temporal Boundaries
P. Tzirakis, M. A. Nicolaou, B. Schuller, S. Zafeiriou
14th IEEE International Conference on Automatic Face and Gesture Recognition (FG)
Deep Affect Prediction in-the-wild: Aff-Wild Database and Challenge, Deep Architectures, and Beyond
D. Kollias, P. Tzirakis, M. A. Nicolaou, et al.
International Journal of Computer Vision (IJCV)

2018

Multi-Attribute Probabilistic Linear Discriminant Analysis for 3D Facial Shapes
S. Moschoglou, S. Ploumpis, M. A. Nicolaou, S. Zafeiriou
14th Asian Conference on Computer Vision (ACCV)
Less is More: Univariate Modelling to Detect Early Parkinson’s Disease from Keystroke Dynamics
A. Milne, K. Farrahi, M. A. Nicolaou
21st International Conference on Discovery Science (DS) — oral
Streaming Behaviour: Live Streaming as a Paradigm for Multi-view Analysis of Emotional and Social Signals
M. A. Nicolaou, C. Ringer
International Conference on the Foundations of Digital Games (FDG) Workshops
Deep Unsupervised Multi-View Detection of Video Game Stream Highlights
C. Ringer, M. A. Nicolaou
International Conference on the Foundations of Digital Games (FDG) — oral
Deep Neuroevolution: Training Deep Neural Networks for False Alarm Detection in Intensive Care Units
H. Oroojeni, M. M. al Rifaie, M. A. Nicolaou
26th European Signal Processing Conference (EUSIPCO)
Multi-Attribute Robust Component Analysis for Facial UV Maps
S. Moschoglou, E. Ververas, Y. Panagakis, M. A. Nicolaou, S. Zafeiriou
IEEE Journal of Selected Topics in Signal Processing

2017

Discovering the Typing Behaviour of Parkinson’s Patients Using Topic Models
A. Milne, M. A. Nicolaou, K. Farrahi
9th International Conference on Social Informatics (SocInfo)
Aff-Wild: Valence and Arousal in-the-wild Challenge
S. Zafeiriou, D. Kollias, M. A. Nicolaou, A. Papaioannou, G. Zhao, I. Kotsia
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops — oral
Recognition of affect in the wild using deep neural networks
D. Kollias, M. A. Nicolaou, I. Kotsia, G. Zhao, S. Zafeiriou
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops — oral
Initializing Probabilistic Linear Discriminant Analysis
S. Moschoglou, M. A. Nicolaou, Y. Panagakis, S. Zafeiriou
European Signal Processing Conference (EUSIPCO) — oral
Dynamic Probabilistic Linear Discriminant Analysis for Video Classification
A. Fabris, M. A. Nicolaou, I. Kotsia, S. Zafeiriou
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
End-to-End Multimodal Emotion Recognition using Deep Neural Networks
P. Tzirakis, G. Trigeorgis, M. A. Nicolaou, B. Schuller, S. Zafeiriou
IEEE Journal of Selected Topics in Signal Processing
Deep Canonical Time Warping for simultaneous Alignment and Representation Learning of sequences
G. Trigeorgis, M. A. Nicolaou, S. Zafeiriou, B. Schuller
IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)

2016

Facial Affect in-the-wild: A survey and a new Database
S. Zafeiriou, A. Papaioannou, I. Kotsia, M. A. Nicolaou, G. Zhao
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops — oral
Deep Canonical Time Warping
G. Trigeorgis, M. A. Nicolaou, S. Zafeiriou, B. Schuller
IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Mnemonic Descent Method
G. Trigeorgis, P. Snape, M. A. Nicolaou, E. Antonakos, S. Zafeiriou
IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Adieu features? End-to-End Speech Emotion Recognition using a Deep Convolutional Recurrent Network
G. Trigeorgis, F. Ringeval, R. Brueckner, E. Marchi, M. A. Nicolaou, B. Schuller, S. Zafeiriou
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) — oral
Robust Correlated and Individual Component Analysis
Y. Panagakis, M. A. Nicolaou, S. Zafeiriou, M. Pantic
IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)
Probabilistic Slow Features for Behaviour Analysis
L. Zafeiriou, M. A. Nicolaou, S. Zafeiriou, S. Nikitidis, M. Pantic
IEEE Transactions on Neural Networks and Learning Systems (TNNLS)

2015

Towards Deep Alignment of Multimodal Data
G. Trigeorgis, M. A. Nicolaou, S. Zafeiriou, B. Schuller
Workshop on Multimodal Learning, Neural Information Processing Systems (NIPS) — oral spotlight

2014

A Unified Framework for Probabilistic Component Analysis
M. A. Nicolaou, S. Zafeiriou, M. Pantic
European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML/PKDD) — oral
Robust canonical correlation analysis: Audio-visual fusion for learning continuous interest
M. A. Nicolaou, Y. Panagakis, S. Zafeiriou, M. Pantic
IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) — oral
Dynamic Probabilistic CCA for Analysis of Affective Behaviour and Fusion of Continuous Annotations
M. A. Nicolaou, V. Pavlovic, M. Pantic
IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)
Machine Learning Methods for Social Signal Processing
O. Rudovic, M. A. Nicolaou, V. Pavlovic
Social Signal Processing, Springer-Verlag (book chapter)

2013

Robust canonical time warping for the alignment of grossly corrupted sequences
Y. Panagakis, M. A. Nicolaou, S. Zafeiriou, M. Pantic
IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Correlated-Spaces Regression for Learning Continuous Emotion Dimensions
M. A. Nicolaou, Y. Panagakis, S. Zafeiriou, M. Pantic
21st ACM International Conference on Multimedia (ACM MM)
Learning Slow Features for Behaviour Analysis
L. Zafeiriou, M. A. Nicolaou, S. Zafeiriou, S. Nikitidis, M. Pantic
IEEE International Conference on Computer Vision (ICCV)

2012

Dynamic Probabilistic CCA for Analysis of Affective Behaviour
M. A. Nicolaou, V. Pavlovic, M. Pantic
12th European Conference on Computer Vision (ECCV)
Output Associative RVM Regression for Dimensional and Continuous Emotion Prediction
M. A. Nicolaou, H. Gunes, M. Pantic
Image and Vision Computing

2011

A Multi-Layer Hybrid Framework for Dimensional Emotion Classification
M. A. Nicolaou, H. Gunes, M. Pantic
ACM International Conference on Multimedia (ACM MM)
Designing Frameworks for Automatic Affect Prediction and Classification in Dimensional Space
M. A. Nicolaou, H. Gunes, M. Pantic
IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops
Output-Associative RVM Regression for Dimensional and Continuous Emotion Prediction
M. A. Nicolaou, H. Gunes, M. Pantic
IEEE International Conference on Automatic Face and Gesture Recognition (FG) — Best Paper Award
Continuous Prediction of Spontaneous Affect from Multiple Cues and Modalities in Valence-Arousal Space
M. A. Nicolaou, H. Gunes, M. Pantic
IEEE Transactions on Affective Computing
Continuous Analysis of Affect from Voice and Face
H. Gunes, M. A. Nicolaou, M. Pantic
Computer Analysis of Affect from Voice and Face, Springer-Verlag (book chapter)

2010

Audio-visual Classification and Fusion of Spontaneous Affect Data in Likelihood Space
M. A. Nicolaou, H. Gunes, M. Pantic
International Conference on Pattern Recognition (ICPR)
Automatic Segmentation of Spontaneous Data using Dimensional Labels from Multiple Coders
M. A. Nicolaou, H. Gunes, M. Pantic
International Workshop on Multimodal Corpora (LREC MMC)