Search Results for author: Giorgos Stamou

Found 24 papers, 11 papers with code

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

no code implementations11 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

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 Knowledge Graphs

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

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

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

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 +12

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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