Guilherme Ramos

2026

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Statistical Filtering for Fair Item Ranking.
Guilherme Ramos|Ludovico Boratto|Mirko Marras
ACM Transactions on Information Systems (TOIS) 2026 Volume 44 Issue 4
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Bribery-Resistant Ranking Systems: A Multipartite User-Agnostic Framework for AI Act Compliance.
Martim Baltazar|Ludovico Boratto|Mirko Marras|Guilherme Ramos
Advances in Information Retrieval - 48th European Conference on Information Retrieval, ECIR 2026, Delft, The Netherlands, March 29 - April 2, 2026, Proceedings, Part I

2025

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Private Preferences, Public Rankings: A Privacy-Preserving Framework for Marketplace Recommendations.
Guilherme Ramos|Ludovico Boratto|Mirko Marras
Proceedings of the 48th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2025, Padua, Italy, July 13-18, 2025

2024

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Towards Ethical Item Ranking: A Paradigm Shift from User-Centric to Item-Centric Approaches.
Guilherme Ramos|Mirko Marras|Ludovico Boratto
Proceedings of the 47th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2024, Washington DC, USA, July 14-18, 2024

2022

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Regulating Group Exposure for Item Providers in Recommendation.
Mirko Marras|Ludovico Boratto|Guilherme Ramos|Gianni Fenu
SIGIR '22: The 45th International ACM SIGIR Conference on Research and Development in Information Retrieval, Madrid, Spain, July 11 - 15, 2022

2021

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Evaluating the Prediction Bias Induced by Label Imbalance in Multi-label Classification.
Luca Piras|Ludovico Boratto|Guilherme Ramos
CIKM '21: The 30th ACM International Conference on Information and Knowledge Management, Virtual Event, Queensland, Australia, November 1 - 5, 2021
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Reputation Equity in Ranking Systems.
Guilherme Ramos|Ludovico Boratto|Mirko Marras
CIKM '21: The 30th ACM International Conference on Information and Knowledge Management, Virtual Event, Queensland, Australia, November 1 - 5, 2021

2020

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On the negative impact of social influence in recommender systems: A study of bribery in collaborative hybrid algorithms.
Guilherme Ramos|Ludovico Boratto|Carlos Caleiro
Information Processing and Management 2020 Volume 57 Issue 2
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Reputation (In)dependence in Ranking Systems: Demographics Influence Over Output Disparities.
Guilherme Ramos|Ludovico Boratto
Proceedings of the 43rd International ACM SIGIR conference on research and development in Information Retrieval, SIGIR 2020, Virtual Event, China, July 25-30, 2020