Search Results for author: Mirko Marras

Found 30 papers, 14 papers with code

A Cost-Sensitive Meta-Learning Strategy for Fair Provider Exposure in Recommendation

1 code implementation24 Jan 2024 Ludovico Boratto, Giulia Cerniglia, Mirko Marras, Alessandra Perniciano, Barbara Pes

When devising recommendation services, it is important to account for the interests of all content providers, encompassing not only newcomers but also minority demographic groups.

Meta-Learning

Robustness in Fairness against Edge-level Perturbations in GNN-based Recommendation

1 code implementation24 Jan 2024 Ludovico Boratto, Francesco Fabbri, Gianni Fenu, Mirko Marras, Giacomo Medda

Efforts in the recommendation community are shifting from the sole emphasis on utility to considering beyond-utility factors, such as fairness and robustness.

Fairness Recommendation Systems

(Un)fair Exposure in Deep Face Rankings at a Distance

no code implementations22 Aug 2023 Andrea Atzori, Gianni Fenu, Mirko Marras

Law enforcement regularly faces the challenge of ranking suspects from their facial images.

GNNUERS: Fairness Explanation in GNNs for Recommendation via Counterfactual Reasoning

1 code implementation12 Apr 2023 Giacomo Medda, Francesco Fabbri, Mirko Marras, Ludovico Boratto, Gianni Fenu

Moreover, an empirical evaluation of the perturbed network uncovered relevant patterns that justify the nature of the unfairness discovered by the generated explanations.

counterfactual Counterfactual Explanation +3

Trusting the Explainers: Teacher Validation of Explainable Artificial Intelligence for Course Design

1 code implementation17 Dec 2022 Vinitra Swamy, Sijia Du, Mirko Marras, Tanja Käser

Deep learning models for learning analytics have become increasingly popular over the last few years; however, these approaches are still not widely adopted in real-world settings, likely due to a lack of trust and transparency.

Explainable artificial intelligence

Do Not Trust a Model Because It is Confident: Uncovering and Characterizing Unknown Unknowns to Student Success Predictors in Online-Based Learning

no code implementations16 Dec 2022 Roberta Galici, Tanja Käser, Gianni Fenu, Mirko Marras

This weakness is one of the main factors undermining users' trust, since model predictions could for instance lead an instructor to not intervene on a student in need.

Informativeness

The More Secure, The Less Equally Usable: Gender and Ethnicity (Un)fairness of Deep Face Recognition along Security Thresholds

no code implementations30 Sep 2022 Andrea Atzori, Gianni Fenu, Mirko Marras

Commonly, the recognition threshold of a face recognition system is adjusted based on the degree of security for the considered use case.

Face Recognition Fairness

Reinforcement Recommendation Reasoning through Knowledge Graphs for Explanation Path Quality

1 code implementation11 Sep 2022 Giacomo Balloccu, Ludovico Boratto, Gianni Fenu, Mirko Marras

However, the existing explainable recommendation approaches based on KG merely optimize the selected reasoning paths for product relevance, without considering any user-level property of the paths for explanation.

Explainable Recommendation Knowledge Graphs +1

Explaining Bias in Deep Face Recognition via Image Characteristics

1 code implementation23 Aug 2022 Andrea Atzori, Gianni Fenu, Mirko Marras

In this paper, we propose a novel explanatory framework aimed to provide a better understanding of how face recognition models perform as the underlying data characteristics (protected attributes: gender, ethnicity, age; non-protected attributes: facial hair, makeup, accessories, face orientation and occlusion, image distortion, emotions) on which they are tested change.

Attribute Face Recognition +1

Generalisable Methods for Early Prediction in Interactive Simulations for Education

no code implementations4 Jul 2022 Jade Maï Cock, Mirko Marras, Christian Giang, Tanja Käser

In this paper, we investigate the quality and generalisability of models for an early prediction of conceptual understanding based on clickstream data of students across interactive simulations.

Experts' View on Challenges and Needs for Fairness in Artificial Intelligence for Education

no code implementations23 Jun 2022 Gianni Fenu, Roberta Galici, Mirko Marras

In recent years, there has been a stimulating discussion on how artificial intelligence (AI) can support the science and engineering of intelligent educational applications.

Fairness

Meta Transfer Learning for Early Success Prediction in MOOCs

2 code implementations25 Apr 2022 Vinitra Swamy, Mirko Marras, Tanja Käser

Despite the increasing popularity of massive open online courses (MOOCs), many suffer from high dropout and low success rates.

Transfer Learning

Dictionary Attacks on Speaker Verification

no code implementations24 Apr 2022 Mirko Marras, Pawel Korus, Anubhav Jain, Nasir Memon

In this paper, we propose dictionary attacks against speaker verification - a novel attack vector that aims to match a large fraction of speaker population by chance.

Speaker Verification Voice Cloning

Post Processing Recommender Systems with Knowledge Graphs for Recency, Popularity, and Diversity of Explanations

1 code implementation24 Apr 2022 Giacomo Balloccu, Ludovico Boratto, Gianni Fenu, Mirko Marras

Existing explainable recommender systems have mainly modeled relationships between recommended and already experienced products, and shaped explanation types accordingly (e. g., movie "x" starred by actress "y" recommended to a user because that user watched other movies with "y" as an actress).

Explainable Models Explainable Recommendation +8

Regulating Group Exposure for Item Providers in Recommendation

no code implementations24 Apr 2022 Mirko Marras, Ludovico Boratto, Guilherme Ramos, Gianni Fenu

Engaging all content providers, including newcomers or minority demographic groups, is crucial for online platforms to keep growing and working.

Re-Ranking

Robust Reputation Independence in Ranking Systems for Multiple Sensitive Attributes

no code implementations30 Mar 2022 Guilherme Ramos, Ludovico Boratto, Mirko Marras

A notable example is represented by reputation-based ranking systems, a class of systems that rely on users' reputation to generate a non-personalized item-ranking, proved to be biased against certain demographic classes.

Attribute

Consumer Fairness in Recommender Systems: Contextualizing Definitions and Mitigations

1 code implementation21 Jan 2022 Ludovico Boratto, Gianni Fenu, Mirko Marras, Giacomo Medda

In this paper, we conduct a systematic analysis of mitigation procedures against consumer unfairness in rating prediction and top-n recommendation tasks.

Fairness Recommendation Systems

Improving Fairness in Speaker Recognition

no code implementations29 Apr 2021 Gianni Fenu, Giacomo Medda, Mirko Marras, Giacomo Meloni

The human voice conveys unique characteristics of an individual, making voice biometrics a key technology for verifying identities in various industries.

Attribute Fairness +1

Equality of Learning Opportunity via Individual Fairness in Personalized Recommendations

no code implementations7 Jun 2020 Mirko Marras, Ludovico Boratto, Guilherme Ramos, Gianni Fenu

To reduce this effect, we propose a novel post-processing approach that balances personalization and equality of recommended opportunities.

Ethics Fairness +1

Connecting User and Item Perspectives in Popularity Debiasing for Collaborative Recommendation

no code implementations7 Jun 2020 Ludovico Boratto, Gianni Fenu, Mirko Marras

We characterize the recommendations of representative algorithms by means of the proposed metrics, and we show that the item probability of being recommended and the item true positive rate are biased against the item popularity.

Recommendation Systems

Interplay between Upsampling and Regularization for Provider Fairness in Recommender Systems

no code implementations7 Jun 2020 Ludovico Boratto, Gianni Fenu, Mirko Marras

The resulting recommended lists show fairer visibility and exposure, higher minority item coverage, and negligible loss in recommendation utility.

Attribute Fairness +1

ECIR 2020 Workshops: Assessing the Impact of Going Online

no code implementations14 May 2020 Sérgio Nunes, Suzanne Little, Sumit Bhatia, Ludovico Boratto, Guillaume Cabanac, Ricardo Campos, Francisco M. Couto, Stefano Faralli, Ingo Frommholz, Adam Jatowt, Alípio Jorge, Mirko Marras, Philipp Mayr, Giovanni Stilo

In this report, we describe the experience of organizing the ECIR 2020 Workshops in this scenario from two perspectives: the workshop organizers and the workshop participants.

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