Search Results for author: Ludovico Boratto

Found 20 papers, 8 papers with code

User Modeling and User Profiling: A Comprehensive Survey

no code implementations15 Feb 2024 Erasmo Purificato, Ludovico Boratto, Ernesto William De Luca

This survey serves as a comprehensive resource for researchers and practitioners, offering insights into the evolution of user modeling and profiling and guiding the development of more personalized, ethical, and effective AI systems.

Fairness Fake News Detection +3

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

MOReGIn: Multi-Objective Recommendation at the Global and Individual Levels

no code implementations23 Jan 2024 Elizabeth Gómez, David Contreras, Ludovico Boratto, Maria Salamó

The state-of-the-art MORSs either operate at the global or individual level, without assuming the co-existence of the two perspectives.

Fairness Recommendation Systems

Faithful Path Language Modeling for Explainable Recommendation over Knowledge Graph

no code implementations25 Oct 2023 Giacomo Balloccu, Ludovico Boratto, Christian Cancedda, Gianni Fenu, Mirko Marras

This mechanism ensures zero incidence of corrupted paths by enforcing adherence to valid KG connections at the decoding level, agnostic of the underlying model architecture.

Explainable Recommendation Knowledge Graph Embeddings +4

Looks Can Be Deceiving: Linking User-Item Interactions and User's Propensity Towards Multi-Objective Recommendations

no code implementations2 Jul 2023 Patrik Dokoupil, Ladislav Peska, Ludovico Boratto

In this paper, we present the results of a user study in which we monitored the way users interacted with recommended items, as well as their self-proclaimed propensities towards relevance, novelty and diversity objectives.

Recommendation Systems

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

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

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

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

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

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

Reputation (In)dependence in Ranking Systems: Demographics Influence Over Output Disparities

no code implementations25 May 2020 Guilherme Ramos, Ludovico Boratto

In this paper, we formulate the concept of disparate reputation (DR) and study if users characterized by sensitive attributes systematically get a lower reputation, leading to a final ranking that reflects less their preferences.

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.

A Robust Reputation-based Group Ranking System and its Resistance to Bribery

no code implementations13 Apr 2020 Joao Saude, Guilherme Ramos, Ludovico Boratto, Carlos Caleiro

Also, by clustering users, the effect of bribery in the proposed multipartite ranking system is dimmed, comparing to the bipartite case.

Clustering

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