Search Results for author: Giorgos Stamou

Found 38 papers, 21 papers with code

CHORDONOMICON: A Dataset of 666,000 Songs and their Chord Progressions

1 code implementation29 Oct 2024 Spyridon Kantarelis, Konstantinos Thomas, Vassilis Lyberatos, Edmund Dervakos, Giorgos Stamou

Chord progressions encapsulate important information about music, pertaining to its structure and conveyed emotions.

Graph Linearization Methods for Reasoning on Graphs with Large Language Models

no code implementations25 Oct 2024 Christos Xypolopoulos, Guokan Shang, Xiao Fei, Giannis Nikolentzos, Hadi Abdine, Iakovos Evdaimon, Michail Chatzianastasis, Giorgos Stamou, Michalis Vazirgiannis

Large language models have evolved to process multiple modalities beyond text, such as images and audio, which motivates us to explore how to effectively leverage them for graph machine learning tasks.

BERTtime Stories: Investigating the Role of Synthetic Story Data in Language pre-training

no code implementations20 Oct 2024 Nikitas Theodoropoulos, Giorgos Filandrianos, Vassilis Lyberatos, Maria Lymperaiou, Giorgos Stamou

To measure the effect of synthetic story data, we train LTG-BERT encoder models on a combined dataset of: a subset of TinyStories, story completions generated by GPT-Neo, and a subset of the BabyLM dataset.

Language Modelling

RISCORE: Enhancing In-Context Riddle Solving in Language Models through Context-Reconstructed Example Augmentation

1 code implementation24 Sep 2024 Ioannis Panagiotopoulos, Giorgos Filandrianos, Maria Lymperaiou, Giorgos Stamou

Riddle-solving requires advanced reasoning skills, pushing LLMs to engage in abstract thinking and creative problem-solving, often revealing limitations in their cognitive abilities.

Multiple-choice Sentence

"I Never Said That": A dataset, taxonomy and baselines on response clarity classification

1 code implementation20 Sep 2024 Konstantinos Thomas, Giorgos Filandrianos, Maria Lymperaiou, Chrysoula Zerva, Giorgos Stamou

Equivocation and ambiguity in public speech are well-studied discourse phenomena, especially in political science and analysis of political interviews.

GOSt-MT: A Knowledge Graph for Occupation-related Gender Biases in Machine Translation

no code implementations17 Sep 2024 Orfeas Menis Mastromichalakis, Giorgos Filandrianos, Eva Tsouparopoulou, Dimitris Parsanoglou, Maria Symeonaki, Giorgos Stamou

This paper introduces a novel approach to studying occupation-related gender bias through the creation of the GOSt-MT (Gender and Occupation Statistics for Machine Translation) Knowledge Graph.

Machine Translation Translation

MusicLIME: Explainable Multimodal Music Understanding

1 code implementation16 Sep 2024 Theodoros Sotirou, Vassilis Lyberatos, Orfeas Menis Mastromichalakis, Giorgos Stamou

Multimodal models are critical for music understanding tasks, as they capture the complex interplay between audio and lyrics.

Decision Making Fairness +1

Enhancing adversarial robustness in Natural Language Inference using explanations

1 code implementation11 Sep 2024 Alexandros Koulakos, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

The surge of state-of-the-art Transformer-based models has undoubtedly pushed the limits of NLP model performance, excelling in a variety of tasks.

Adversarial Robustness Natural Language Inference +1

Prompt2Fashion: An automatically generated fashion dataset

1 code implementation10 Sep 2024 Georgia Argyrou, Angeliki Dimitriou, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

Despite the provided fine-grained insights on the quality and relevance of generation, we extend the discussion on the importance of expert knowledge for the evaluation of artistic AI-generated datasets such as this one.

ARPA: A Novel Hybrid Model for Advancing Visual Word Disambiguation Using Large Language Models and Transformers

no code implementations12 Aug 2024 Aristi Papastavrou, Maria Lymperaiou, Giorgos Stamou

In the rapidly evolving fields of natural language processing and computer vision, Visual Word Sense Disambiguation (VWSD) stands as a critical, yet challenging task.

Data Augmentation Graph Neural Network +1

Optimal and efficient text counterfactuals using Graph Neural Networks

1 code implementation4 Aug 2024 Dimitris Lymperopoulos, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

As NLP models become increasingly integral to decision-making processes, the need for explainability and interpretability has become paramount.

counterfactual Decision Making +3

Automatic Generation of Fashion Images using Prompting in Generative Machine Learning Models

1 code implementation20 Jul 2024 Georgia Argyrou, Angeliki Dimitriou, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

Emphasizing adaptability in AI-driven fashion creativity, we depart from traditional approaches and focus on prompting techniques, such as zero-shot and few-shot learning, as well as Chain-of-Thought (CoT), which results in a variety of colors and textures, enhancing the diversity of the outputs.

Diversity Few-Shot Learning +2

Semantic Prototypes: Enhancing Transparency Without Black Boxes

1 code implementation18 Jul 2024 Orfeas Menis-Mastromichalakis, Giorgos Filandrianos, Jason Liartis, Edmund Dervakos, Giorgos Stamou

As machine learning (ML) models and datasets increase in complexity, the demand for methods that enhance explainability and interpretability becomes paramount.

Decision Making Informativeness

Deep Ensemble Art Style Recognition

no code implementations19 May 2024 Orfeas Menis-Mastromichalakis, Natasa Sofou, Giorgos Stamou

We also discuss the impact of the data and art styles themselves on the performance of our models forming a manifold perspective on the problem.

Beyond One-Size-Fits-All: Adapting Counterfactual Explanations to User Objectives

no code implementations12 Apr 2024 Orfeas Menis Mastromichalakis, Jason Liartis, Giorgos Stamou

Explainable Artificial Intelligence (XAI) has emerged as a critical area of research aimed at enhancing the transparency and interpretability of AI systems.

counterfactual Decision Making +2

AILS-NTUA at SemEval-2024 Task 6: Efficient model tuning for hallucination detection and analysis

1 code implementation1 Apr 2024 Natalia Grigoriadou, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

In this paper, we present our team's submissions for SemEval-2024 Task-6 - SHROOM, a Shared-task on Hallucinations and Related Observable Overgeneration Mistakes.

Binary Classification Hallucination +1

Masked Generative Story Transformer with Character Guidance and Caption Augmentation

1 code implementation13 Mar 2024 Christos Papadimitriou, Giorgos Filandrianos, Maria Lymperaiou, Giorgos Stamou

Story Visualization (SV) is a challenging generative vision task, that requires both visual quality and consistency between different frames in generated image sequences.

Language Modelling Large Language Model +1

Structure Your Data: Towards Semantic Graph Counterfactuals

1 code implementation11 Mar 2024 Angeliki Dimitriou, Maria Lymperaiou, Giorgos Filandrianos, Konstantinos Thomas, Giorgos Stamou

With a focus on the visual domain, we represent images as scene graphs and obtain their GNN embeddings to bypass solving the NP-hard graph similarity problem for all input pairs, an integral part of the CE computation process.

counterfactual Descriptive +1

Puzzle Solving using Reasoning of Large Language Models: A Survey

no code implementations17 Feb 2024 Panagiotis Giadikiaroglou, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

Exploring the capabilities of Large Language Models (LLMs) in puzzle solving unveils critical insights into their potential and challenges in AI, marking a significant step towards understanding their applicability in complex reasoning tasks.

Logical Reasoning Survey

Graph Edits for Counterfactual Explanations: A comparative study

no code implementations21 Jan 2024 Angeliki Dimitriou, Nikolaos Chaidos, Maria Lymperaiou, Giorgos Stamou

Counterfactuals have been established as a popular explainability technique which leverages a set of minimal edits to alter the prediction of a classifier.

counterfactual Graph Neural Network +1

Perceptual Musical Features for Interpretable Audio Tagging

1 code implementation18 Dec 2023 Vassilis Lyberatos, Spyridon Kantarelis, Edmund Dervakos, Giorgos Stamou

In the age of music streaming platforms, the task of automatically tagging music audio has garnered significant attention, driving researchers to devise methods aimed at enhancing performance metrics on standard datasets.

Audio Tagging Interpretable Machine Learning +2

Large Language Models and Multimodal Retrieval for Visual Word Sense Disambiguation

1 code implementation21 Oct 2023 Anastasia Kritharoula, Maria Lymperaiou, Giorgos Stamou

We also study VWSD as a unimodal problem by converting to text-to-text and image-to-image retrieval, as well as question-answering (QA), to fully explore the capabilities of relevant models.

Answer Generation Image Retrieval +3

Language Models as Knowledge Bases for Visual Word Sense Disambiguation

1 code implementation3 Oct 2023 Anastasia Kritharoula, Maria Lymperaiou, Giorgos Stamou

Visual Word Sense Disambiguation (VWSD) is a novel challenging task that lies between linguistic sense disambiguation and fine-grained multimodal retrieval.

Image Captioning Multiple-choice +3

Employing Crowdsourcing for Enriching a Music Knowledge Base in Higher Education

1 code implementation12 Jun 2023 Vassilis Lyberatos, Spyridon Kantarelis, Eirini Kaldeli, Spyros Bekiaris, Panagiotis Tzortzis, Orfeas Menis - Mastromichalakis, Giorgos Stamou

The campaign's results and the comments gathered through an online survey enable us to draw some useful insights about the benefits and challenges of integrating crowdsourcing into computer science curricula and how this can enhance students' engagement in the learning process.

Music Tagging

Choose your Data Wisely: A Framework for Semantic Counterfactuals

1 code implementation28 May 2023 Edmund Dervakos, Konstantinos Thomas, Giorgos Filandrianos, Giorgos Stamou

In this work, we build on these ideas, and propose a framework that provides counterfactual explanations in terms of knowledge graphs.

counterfactual Counterfactual Explanation +1

Counterfactuals of Counterfactuals: a back-translation-inspired approach to analyse counterfactual editors

1 code implementation26 May 2023 Giorgos Filandrianos, Edmund Dervakos, Orfeas Menis-Mastromichalakis, Chrysoula Zerva, Giorgos Stamou

We propose a new back translation-inspired evaluation methodology that utilises earlier outputs of the explainer as ground truth proxies to investigate the consistency of explainers.

counterfactual

GreekBART: The First Pretrained Greek Sequence-to-Sequence Model

2 code implementations3 Apr 2023 Iakovos Evdaimon, Hadi Abdine, Christos Xypolopoulos, Stamatis Outsios, Michalis Vazirgiannis, Giorgos Stamou

In addition, we examine its performance on two NLG tasks from GreekSUM, a newly introduced summarization dataset for the Greek language.

Natural Language Inference Text Generation +2

Knowledge-Based Counterfactual Queries for Visual Question Answering

no code implementations5 Mar 2023 Theodoti Stoikou, Maria Lymperaiou, Giorgos Stamou

Visual Question Answering (VQA) has been a popular task that combines vision and language, with numerous relevant implementations in literature.

counterfactual Decision Making +2

Fine-Grained ImageNet Classification in the Wild

1 code implementation4 Mar 2023 Maria Lymperaiou, Konstantinos Thomas, Giorgos Stamou

Image classification has been one of the most popular tasks in Deep Learning, seeing an abundance of impressive implementations each year.

Classification Image Classification

The Contribution of Knowledge in Visiolinguistic Learning: A Survey on Tasks and Challenges

no code implementations4 Mar 2023 Maria Lymperaiou, Giorgos Stamou

Recent advancements in visiolinguistic (VL) learning have allowed the development of multiple models and techniques that offer several impressive implementations, able to currently resolve a variety of tasks that require the collaboration of vision and language.

Knowledge Graphs

Counterfactual Edits for Generative Evaluation

no code implementations2 Mar 2023 Maria Lymperaiou, Giorgos Filandrianos, Konstantinos Thomas, Giorgos Stamou

Evaluation of generative models has been an underrepresented field despite the surge of generative architectures.

counterfactual Story Visualization

An Impartial Transformer for Story Visualization

no code implementations9 Jan 2023 Nikolaos Tsakas, Maria Lymperaiou, Giorgos Filandrianos, Giorgos Stamou

Story Visualization is an advanced task of computed vision that targets sequential image synthesis, where the generated samples need to be realistic, faithful to their conditioning and sequentially consistent.

Image Generation Story Visualization

A survey on knowledge-enhanced multimodal learning

no code implementations19 Nov 2022 Maria Lymperaiou, Giorgos Stamou

Multimodal learning has been a field of increasing interest, aiming to combine various modalities in a single joint representation.

Conditional Image Generation Factual Visual Question Answering +13

Computing Rule-Based Explanations of Machine Learning Classifiers using Knowledge Graphs

no code implementations8 Feb 2022 Edmund Dervakos, Orfeas Menis-Mastromichalakis, Alexandros Chortaras, Giorgos Stamou

The use of symbolic knowledge representation and reasoning as a way to resolve the lack of transparency of machine learning classifiers is a research area that lately attracts many researchers.

BIG-bench Machine Learning Knowledge Graphs

Semantic Enrichment of Pretrained Embedding Output for Unsupervised IR

no code implementations AAAI-MAKE 2021 Edmund Dervakos, Giorgos Filandrianos, Konstantinos Thomas, Alexios Mandalios, Chrysoula Zerva, Giorgos Stamou

The rapid growth of scientific literature in the biomedical and clinical domain has significantly com- plicated the identification of information of interest by researchers as well as other practitioners.

Information Retrieval Navigate

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