no code implementations • 6 Sep 2024 • Daniele Malitesta, Giacomo Medda, Erasmo Purificato, Ludovico Boratto, Fragkiskos D. Malliaros, Mirko Marras, Ernesto William De Luca
Diffusion-based recommender systems have recently proven to outperform traditional generative recommendation approaches, such as variational autoencoders and generative adversarial networks.
1 code implementation • 22 Aug 2024 • Ludovico Boratto, Francesco Fabbri, Gianni Fenu, Mirko Marras, Giacomo Medda
Despite emerging regulations addressing fairness of automated systems, unfairness issues in graph collaborative filtering remain underexplored, especially from the consumer's perspective.
no code implementations • 15 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.
1 code implementation • 24 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.
1 code implementation • 24 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.
no code implementations • 23 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.
no code implementations • 25 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.
1 code implementation • 23 Aug 2023 • Ludovico Boratto, Francesco Fabbri, Gianni Fenu, Mirko Marras, Giacomo Medda
In recommendation literature, explainability and fairness are becoming two prominent perspectives to consider.
no code implementations • 2 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.
1 code implementation • 12 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.
1 code implementation • 14 Jan 2023 • Giacomo Balloccu, Ludovico Boratto, Christian Cancedda, Gianni Fenu, Mirko Marras
Path reasoning is a notable recommendation approach that models high-order user-product relations, based on a Knowledge Graph (KG).
1 code implementation • 11 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.
1 code implementation • 24 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).
Ranked #1 on Music Recommendation on Last.FM
no code implementations • 24 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.
no code implementations • 30 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.
1 code implementation • 21 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.
no code implementations • 7 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.
no code implementations • 7 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.
no code implementations • 7 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.
no code implementations • 25 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.
no code implementations • 14 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.
no code implementations • 13 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.