Search Results for author: Derek Greene

Found 27 papers, 9 papers with code

A Deep Learning Approach for Selective Relevance Feedback

no code implementations20 Jan 2024 Suchana Datta, Debasis Ganguly, Sean MacAvaney, Derek Greene

Additionally, to further improve retrieval effectiveness with this selective PRF approach, we make use of the model's confidence estimates to combine the information from the original and expanded queries.

Retrieval

The Role of Document Embedding in Research Paper Recommender Systems: To Breakdown or to Bolster Disciplinary Borders?

no code implementations26 Sep 2023 Eoghan Cunningham, Derek Greene, Barry Smyth

In the extensive recommender systems literature, novelty and diversity have been identified as key properties of useful recommendations.

Document Embedding Recommendation Systems

Topic-Centric Explanations for News Recommendation

1 code implementation13 Jun 2023 Dairui Liu, Derek Greene, Irene Li, Xuefei Jiang, Ruihai Dong

News recommender systems (NRS) have been widely applied for online news websites to help users find relevant articles based on their interests.

Explainable Recommendation News Recommendation +1

Curatr: A Platform for Semantic Analysis and Curation of Historical Literary Texts

no code implementations13 Jun 2023 Susan Leavy, Gerardine Meaney, Karen Wade, Derek Greene

The increasing availability of digital collections of historical and contemporary literature presents a wealth of possibilities for new research in the humanities.

Word Embeddings

On the Feasibility and Robustness of Pointwise Evaluation of Query Performance Prediction

no code implementations1 Apr 2023 Suchana Datta, Debasis Ganguly, Derek Greene, Mandar Mitra

Despite the retrieval effectiveness of queries being mutually independent of one another, the evaluation of query performance prediction (QPP) systems has been carried out by measuring rank correlation over an entire set of queries.

Retrieval

Counterfactual Explanations for Misclassified Images: How Human and Machine Explanations Differ

1 code implementation16 Dec 2022 Eoin Delaney, Arjun Pakrashi, Derek Greene, Mark T. Keane

Counterfactual explanations have emerged as a popular solution for the eXplainable AI (XAI) problem of elucidating the predictions of black-box deep-learning systems due to their psychological validity, flexibility across problem domains and proposed legal compliance.

counterfactual Explainable Artificial Intelligence (XAI)

Deep-QPP: A Pairwise Interaction-based Deep Learning Model for Supervised Query Performance Prediction

no code implementations15 Feb 2022 Suchana Datta, Debasis Ganguly, Derek Greene, Mandar Mitra

In contrast to unsupervised approaches that rely on various statistics of document score distributions, our approach is entirely data-driven.

An Analysis of Variations in the Effectiveness of Query Performance Prediction

no code implementations13 Feb 2022 Debasis Ganguly, Suchana Datta, Mandar Mitra, Derek Greene

An important characteristic of QPP evaluation is that, since the ground truth retrieval effectiveness for QPP evaluation can be measured with different metrics, the ground truth itself is not absolute, which is in contrast to other retrieval tasks, such as that of ad-hoc retrieval.

Retrieval

Uncertainty Estimation and Out-of-Distribution Detection for Counterfactual Explanations: Pitfalls and Solutions

no code implementations20 Jul 2021 Eoin Delaney, Derek Greene, Mark T. Keane

Whilst an abundance of techniques have recently been proposed to generate counterfactual explanations for the predictions of opaque black-box systems, markedly less attention has been paid to exploring the uncertainty of these generated explanations.

counterfactual Medical Diagnosis +1

Twin Systems for DeepCBR: A Menagerie of Deep Learning and Case-Based Reasoning Pairings for Explanation and Data Augmentation

no code implementations29 Apr 2021 Mark T Keane, Eoin M Kenny, Mohammed Temraz, Derek Greene, Barry Smyth

Recently, it has been proposed that fruitful synergies may exist between Deep Learning (DL) and Case Based Reasoning (CBR); that there are insights to be gained by applying CBR ideas to problems in DL (what could be called DeepCBR).

counterfactual Data Augmentation +2

Instance-based Counterfactual Explanations for Time Series Classification

1 code implementation28 Sep 2020 Eoin Delaney, Derek Greene, Mark T. Keane

In recent years, there has been a rapidly expanding focus on explaining the predictions made by black-box AI systems that handle image and tabular data.

Classification counterfactual +6

Bone Segmentation in Contrast Enhanced Whole-Body Computed Tomography

no code implementations12 Aug 2020 Patrick Leydon, Martin O'Connell, Derek Greene, Kathleen M Curran

Segmentation of bone regions allows for enhanced diagnostics, disease characterisation and treatment monitoring in CT imaging.

Segmentation

Mitigating Gender Bias in Machine Learning Data Sets

no code implementations14 May 2020 Susan Leavy, Gerardine Meaney, Karen Wade, Derek Greene

Artificial Intelligence has the capacity to amplify and perpetuate societal biases and presents profound ethical implications for society.

BIG-bench Machine Learning Fairness +1

Temporal Analysis of Reddit Networks via Role Embeddings

no code implementations14 Aug 2019 Siobhan Grayson, Derek Greene

Inspired by diachronic word analysis from the field of natural language processing, we propose an approach for uncovering temporal insights regarding user roles from social networks using graph embedding methods.

Role Embedding

MeetupNet Dublin: Discovering Communities in Dublin's Meetup Network

1 code implementation6 Oct 2018 Arjun Pakrashi, Elham Alghamdi, Brian Mac Namee, Derek Greene

Meetup. com is a global online platform which facilitates the organisation of meetups in different parts of the world.

Social and Information Networks Computers and Society

Stability of Topic Modeling via Matrix Factorization

1 code implementation23 Feb 2017 Mark Belford, Brian Mac Namee, Derek Greene

Topic models can provide us with an insight into the underlying latent structure of a large corpus of documents.

Clustering Ensemble Learning +1

EVE: Explainable Vector Based Embedding Technique Using Wikipedia

no code implementations22 Feb 2017 M. Atif Qureshi, Derek Greene

We present an unsupervised explainable word embedding technique, called EVE, which is built upon the structure of Wikipedia.

Exploring the Political Agenda of the European Parliament Using a Dynamic Topic Modeling Approach

1 code implementation11 Jul 2016 Derek Greene, James P. Cross

To unveil the plenary agenda and detect latent themes in legislative speeches over time, MEP speech content is analyzed using a new dynamic topic modeling method based on two layers of Non-negative Matrix Factorization (NMF).

Dynamic Topic Modeling

Indicators of Good Student Performance in Moodle Activity Data

no code implementations12 Jan 2016 Ewa Młynarska, Derek Greene, Pádraig Cunningham

In this paper we conduct an analysis of Moodle activity data focused on identifying early predictors of good student performance.

Unveiling the Political Agenda of the European Parliament Plenary: A Topical Analysis

no code implementations27 May 2015 Derek Greene, James P. Cross

This study analyzes political interactions in the European Parliament (EP) by considering how the political agenda of the plenary sessions has evolved over time and the manner in which Members of the European Parliament (MEPs) have reacted to external and internal stimuli when making Parliamentary speeches.

Dynamic Topic Modeling

A Latent Space Analysis of Editor Lifecycles in Wikipedia

no code implementations29 Jul 2014 Xiangju Qin, Derek Greene, Pádraig Cunningham

Collaborations such as Wikipedia are a key part of the value of the modern Internet.

How Many Topics? Stability Analysis for Topic Models

1 code implementation16 Apr 2014 Derek Greene, Derek O'Callaghan, Pádraig Cunningham

Topic modeling refers to the task of discovering the underlying thematic structure in a text corpus, where the output is commonly presented as a report of the top terms appearing in each topic.

Clustering Model Selection +1

Adaptive Representations for Tracking Breaking News on Twitter

no code implementations12 Mar 2014 Igor Brigadir, Derek Greene, Pádraig Cunningham

In this paper we examine the effectiveness of adaptive mechanisms for tracking and summarizing breaking news stories.

Retrieval

Normalized Mutual Information to evaluate overlapping community finding algorithms

5 code implementations11 Oct 2011 Aaron F. McDaid, Derek Greene, Neil Hurley

Given the increasing popularity of algorithms for overlapping clustering, in particular in social network analysis, quantitative measures are needed to measure the accuracy of a method.

Physics and Society Social and Information Networks Data Analysis, Statistics and Probability

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