Search Results for author: Mihalis A. Nicolaou

Found 18 papers, 9 papers with code

Multilinear Mixture of Experts: Scalable Expert Specialization through Factorization

1 code implementation19 Feb 2024 James Oldfield, Markos Georgopoulos, Grigorios G. Chrysos, Christos Tzelepis, Yannis Panagakis, Mihalis A. Nicolaou, Jiankang Deng, Ioannis Patras

The Mixture of Experts (MoE) paradigm provides a powerful way to decompose inscrutable dense layers into smaller, modular computations often more amenable to human interpretation, debugging, and editability.

Attribute counterfactual

Locality-preserving Directions for Interpreting the Latent Space of Satellite Image GANs

no code implementations26 Sep 2023 Georgia Kourmouli, Nikos Kostagiolas, Yannis Panagakis, Mihalis A. Nicolaou

We present a locality-aware method for interpreting the latent space of wavelet-based Generative Adversarial Networks (GANs), that can well capture the large spatial and spectral variability that is characteristic to satellite imagery.

Data Augmentation Scene Classification

Parts of Speech-Grounded Subspaces in Vision-Language Models

2 code implementations23 May 2023 James Oldfield, Christos Tzelepis, Yannis Panagakis, Mihalis A. Nicolaou, Ioannis Patras

Latent image representations arising from vision-language models have proved immensely useful for a variety of downstream tasks.

Image Generation POS +1

Unsupervised Discovery of Semantic Concepts in Satellite Imagery with Style-based Wavelet-driven Generative Models

2 code implementations3 Aug 2022 Nikos Kostagiolas, Mihalis A. Nicolaou, Yannis Panagakis

In recent years, considerable advancements have been made in the area of Generative Adversarial Networks (GANs), particularly with the advent of style-based architectures that address many key shortcomings - both in terms of modeling capabilities and network interpretability.

Data Augmentation

PandA: Unsupervised Learning of Parts and Appearances in the Feature Maps of GANs

1 code implementation31 May 2022 James Oldfield, Christos Tzelepis, Yannis Panagakis, Mihalis A. Nicolaou, Ioannis Patras

Recent advances in the understanding of Generative Adversarial Networks (GANs) have led to remarkable progress in visual editing and synthesis tasks, capitalizing on the rich semantics that are embedded in the latent spaces of pre-trained GANs.

Tensor Component Analysis for Interpreting the Latent Space of GANs

no code implementations23 Nov 2021 James Oldfield, Markos Georgopoulos, Yannis Panagakis, Mihalis A. Nicolaou, Ioannis Patras

This paper addresses the problem of finding interpretable directions in the latent space of pre-trained Generative Adversarial Networks (GANs) to facilitate controllable image synthesis.

Image Generation

Classification of Influenza Hemagglutinin Protein Sequences using Convolutional Neural Networks

1 code implementation9 Aug 2021 Charalambos Chrysostomou, Floris Alexandrou, Mihalis A. Nicolaou, Huseyin Seker

This paper focuses on accurately predicting if an Influenza type A virus can infect specific hosts, and more specifically, Human, Avian and Swine hosts, using only the protein sequence of the HA gene.

Classification

Tensor Methods in Computer Vision and Deep Learning

no code implementations7 Jul 2021 Yannis Panagakis, Jean Kossaifi, Grigorios G. Chrysos, James Oldfield, Mihalis A. Nicolaou, Anima Anandkumar, Stefanos Zafeiriou

Tensors, or multidimensional arrays, are data structures that can naturally represent visual data of multiple dimensions.

Representation Learning

Enhancing Facial Data Diversity with Style-based Face Aging

no code implementations6 Jun 2020 Markos Georgopoulos, James Oldfield, Mihalis A. Nicolaou, Yannis Panagakis, Maja Pantic

By evaluating on several age-annotated datasets in both single- and cross-database experiments, we show that the proposed method outperforms state-of-the-art algorithms for age transfer, especially in the case of age groups that lie in the tails of the label distribution.

Data Augmentation

Multimodal Joint Emotion and Game Context Recognition in League of Legends Livestreams

1 code implementation31 May 2019 Charles Ringer, James Alfred Walker, Mihalis A. Nicolaou

Video game streaming provides the viewer with a rich set of audio-visual data, conveying information both with regards to the game itself, through game footage and audio, as well as the streamer's emotional state and behaviour via webcam footage and audio.

Adversarial Learning of Disentangled and Generalizable Representations for Visual Attributes

1 code implementation9 Apr 2019 James Oldfield, Yannis Panagakis, Mihalis A. Nicolaou

Recently, a multitude of methods for image-to-image translation have demonstrated impressive results on problems such as multi-domain or multi-attribute transfer.

Attribute Image-to-Image Translation +1

End-to-End Multimodal Emotion Recognition using Deep Neural Networks

2 code implementations27 Apr 2017 Panagiotis Tzirakis, George Trigeorgis, Mihalis A. Nicolaou, Björn Schuller, Stefanos Zafeiriou

The system is then trained in an end-to-end fashion where - by also taking advantage of the correlations of the each of the streams - we manage to significantly outperform the traditional approaches based on auditory and visual handcrafted features for the prediction of spontaneous and natural emotions on the RECOLA database of the AVEC 2016 research challenge on emotion recognition.

Multimodal Emotion Recognition Retrieval

Deep Canonical Time Warping

no code implementations CVPR 2016 George Trigeorgis, Mihalis A. Nicolaou, Stefanos Zafeiriou, Bjorn W. Schuller

Thus, they fail to capture complex, hierarchical non-linear representations which may prove to be beneficial towards the task of temporal alignment, particularly when dealing with multi-modal data (e. g., aligning visual and acoustic information).

Time Series Time Series Analysis

Robust Canonical Time Warping for the Alignment of Grossly Corrupted Sequences

no code implementations CVPR 2013 Yannis Panagakis, Mihalis A. Nicolaou, Stefanos Zafeiriou, Maja Pantic

The superiority of the proposed method against the state-of-the-art time alignment methods, namely the canonical time warping and the generalized time warping, is indicated by the experimental results on both synthetic and real datasets.

Compressive Sensing Dynamic Time Warping

A Unified Framework for Probabilistic Component Analysis

no code implementations13 Mar 2013 Mihalis A. Nicolaou, Stefanos Zafeiriou, Maja Pantic

We present a unifying framework which reduces the construction of probabilistic component analysis techniques to a mere selection of the latent neighbourhood, thus providing an elegant and principled framework for creating novel component analysis models as well as constructing probabilistic equivalents of deterministic component analysis methods.

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