no code implementations • 27 Dec 2024 • Ioannis Bilionis, Ricardo C. Berrios, Luis Fernandez-Luque, Carlos Castillo
Machine Learning (ML) algorithms are vital for supporting clinical decision-making in biomedical informatics.
no code implementations • 7 Jul 2024 • Maddalena Amendola, Carlos Castillo, Andrea Passarella, Raffaele Perego
To the best of our knowledge, this study is the first to focus on detecting and mitigating gender bias in EF methods.
no code implementations • 20 Nov 2023 • Alexandra Olteanu, Michael Ekstrand, Carlos Castillo, Jina Suh
All types of research, development, and policy work can have unintended, adverse consequences - work in responsible artificial intelligence (RAI), ethical AI, or ethics in AI is no exception.
1 code implementation • 18 Aug 2023 • Arpit Merchant, Carlos Castillo
Graph neural networks (GNNs) are increasingly used in critical human applications for predicting node labels in attributed graphs.
no code implementations • 16 May 2023 • Lorenzo Porcaro, Carlos Castillo, Emilia Gómez, João Vinagre
Among the seven key requirements to achieve trustworthy AI proposed by the High-Level Expert Group on Artificial Intelligence (AI-HLEG) established by the European Commission (EC), the fifth requirement ("Diversity, non-discrimination and fairness") declares: "In order to achieve Trustworthy AI, we must enable inclusion and diversity throughout the entire AI system's life cycle.
1 code implementation • 1 Dec 2022 • Lorenzo Porcaro, Emilia Gómez, Carlos Castillo
We present the results of a 12-week longitudinal user study wherein the participants, 110 subjects from Southern Europe, received on a daily basis Electronic Music (EM) diversified recommendations.
1 code implementation • 21 Apr 2022 • Fedor Vitiugin, Carlos Castillo
Queries are written in one of the languages supported by the embeddings, and the extracted sentences can be in any of the other languages supported.
no code implementations • 24 Mar 2022 • David Solans, Andrea Beretta, Manuel Portela, Carlos Castillo, Anna Monreale
We observe that this setting elicits mostly rational behavior from participants, who place a moderate amount of trust in the DSS and show neither algorithmic aversion (under-reliance) nor automation bias (over-reliance). However, their stated willingness to accept the DSS in the exit survey seems less sensitive to the accuracy of the DSS than their behavior, suggesting that users are only partially aware of the (lack of) accuracy of the DSS.
1 code implementation • 1 Feb 2022 • Francesco Fabbri, Yanhao Wang, Francesco Bonchi, Carlos Castillo, Michael Mathioudakis
Hence, we define the problem of reducing the prevalence of radicalization pathways by selecting a small number of edges to "rewire", so to minimize the maximum of segregation scores among all radicalized nodes, while maintaining the relevance of the recommendations.
no code implementations • 25 Jan 2022 • Lorenzo Porcaro, Emilia Gómez, Carlos Castillo
In this study, we interview several listeners about the role that diversity plays in their listening experience, trying to get a better understanding of how they interact with music recommendations.
no code implementations • 25 Oct 2021 • Panayiotis Smeros, Carlos Castillo, Karl Aberer
This paper describes SciClops, a method to help combat online scientific misinformation.
no code implementations • 16 Mar 2021 • Marzieh Karimi-Haghighi, Carlos Castillo, Davinia Hernandez-Leo, Veronica Moreno Oliver
In this work, the problem of predicting dropout risk in undergraduate studies is addressed from a perspective of algorithmic fairness.
1 code implementation • 28 Jan 2021 • Lorenzo Porcaro, Emilia Gómez, Carlos Castillo
Shared practices to assess the diversity of retrieval system results are still debated in the Information Retrieval community, partly because of the challenges of determining what diversity means in specific scenarios, and of understanding how diversity is perceived by end-users.
no code implementations • 23 Dec 2020 • Meike Zehlike, Tom Sühr, Carlos Castillo
In this report we provide an improvement of the significance adjustment from the FA*IR algorithm of Zehlike et al., which did not work for very short rankings in combination with a low minimum proportion $p$ for the protected group.
no code implementations • 10 Dec 2020 • Valerio Lorini, Carlos Castillo, Domenico Nappo, Francesco Dottori, Peter Salamon
Social media can be used for disaster risk reduction as a complement to traditional information sources, and the literature has suggested numerous ways to achieve this.
1 code implementation • 3 Sep 2020 • Dougal Shakespeare, Lorenzo Porcaro, Emilia Gómez, Carlos Castillo
Music Recommender Systems (mRS) are designed to give personalised and meaningful recommendations of items (i. e. songs, playlists or artists) to a user base, thereby reflecting and further complementing individual users' specific music preferences.
no code implementations • 27 Aug 2020 • Angelika Romanou, Panayiotis Smeros, Carlos Castillo, Karl Aberer
We demonstrate the SciLens News Platform, a novel system for evaluating the quality of news articles.
no code implementations • 2 Jul 2020 • Corinna Hertweck, Carlos Castillo, Michael Mathioudakis
In this paper, we study university admissions under a centralized system that uses grades and standardized test scores to match applicants to university programs.
1 code implementation • 15 Apr 2020 • David Solans, Battista Biggio, Carlos Castillo
Research in adversarial machine learning has shown how the performance of machine learning models can be seriously compromised by injecting even a small fraction of poisoning points into the training data.
1 code implementation • 10 Mar 2020 • Marius Miron, Songül Tolan, Emilia Gómez, Carlos Castillo
The Fairness, Accountability, and Transparency in Machine Learning (FAT-ML) literature proposes a varied set of group fairness metrics to measure discrimination against socio-demographic groups that are characterized by a protected feature, such as gender or race. Such a system can be deemed as either fair or unfair depending on the choice of the metric.
no code implementations • 16 Feb 2020 • Aris Anagnostopoulos, Carlos Castillo, Adriano Fazzone, Stefano Leonardi, Evimaria Terzi
In this paper, we provide algorithms for outsourcing and hiring workers in a general setting, where workers form a team and contribute different skills to perform a task.
1 code implementation • 23 Jan 2020 • Valerio Lorini, Javier Rando, Diego Saez-Trumper, Carlos Castillo
We also note how coverage of floods in countries with the lowest income, as well as countries in South America, is substantially lower than the coverage of floods in middle-income countries.
1 code implementation • 5 Dec 2019 • Oana Balalau, Carlos Castillo, Mauro Sozio
Despite the significant efforts made by the research community in recent years, automatically acquiring valuable information about high impact-events from social media remains challenging.
no code implementations • 18 Aug 2019 • Ugur Kursuncu, Manas Gaur, Carlos Castillo, Amanuel Alambo, K. Thirunarayan, Valerie Shalin, Dilshod Achilov, I. Budak Arpinar, Amit Sheth
Our study makes three contributions to reliable analysis: (i) Development of a computational approach rooted in the contextual dimensions of religion, ideology, and hate that reflects strategies employed by online Islamist extremist groups, (ii) An in-depth analysis of relevant tweet datasets with respect to these dimensions to exclude likely mislabeled users, and (iii) A framework for understanding online radicalization as a process to assist counter-programming.
no code implementations • 16 Jul 2019 • Rahul Pandey, Carlos Castillo, Hemant Purohit
High-quality human annotations are necessary to create effective machine learning systems for social media.
no code implementations • 27 May 2019 • Meike Zehlike, Tom Sühr, Carlos Castillo, Ivan Kitanovski
We implement two algorithms from the fair ranking literature, namely FA*IR (Zehlike et al., 2017) and DELTR (Zehlike and Castillo, 2018) and provide them as stand-alone libraries in Python and Java.
no code implementations • 13 Mar 2019 • Panayiotis Smeros, Carlos Castillo, Karl Aberer
Based on these aspects, we describe a series of indicators of news quality.
no code implementations • 7 Jun 2018 • Emilia Gómez, Carlos Castillo, Vicky Charisi, Verónica Dahl, Gustavo Deco, Blagoj Delipetrev, Nicole Dewandre, Miguel Ángel González-Ballester, Fabien Gouyon, José Hernández-Orallo, Perfecto Herrera, Anders Jonsson, Ansgar Koene, Martha Larson, Ramón López de Mántaras, Bertin Martens, Marius Miron, Rubén Moreno-Bote, Nuria Oliver, Antonio Puertas Gallardo, Heike Schweitzer, Nuria Sebastian, Xavier Serra, Joan Serrà, Songül Tolan, Karina Vold
The workshop gathered an interdisciplinary group of experts to establish the state of the art research in the field and a list of future research challenges to be addressed on the topic of human and machine intelligence, algorithm's potential impact on human cognitive capabilities and decision making, and evaluation and regulation needs.
8 code implementations • 22 May 2018 • Meike Zehlike, Carlos Castillo
Ranked search results have become the main mechanism by which we find content, products, places, and people online.
Information Retrieval Computers and Society H.3.3
1 code implementation • 16 Apr 2018 • Alexandra Olteanu, Carlos Castillo, Jeremy Boy, Kush R. Varshney
In this paper, we focus on quantifying the impact of violent events on various types of hate speech, from offensive and derogatory to intimidation and explicit calls for violence.
Social and Information Networks Computers and Society
3 code implementations • 20 Jun 2017 • Meike Zehlike, Francesco Bonchi, Carlos Castillo, Sara Hajian, Mohamed Megahed, Ricardo Baeza-Yates
In this work, we define and solve the Fair Top-k Ranking problem, in which we want to determine a subset of k candidates from a large pool of n >> k candidates, maximizing utility (i. e., select the "best" candidates) subject to group fairness criteria.
no code implementations • 21 May 2017 • Ankan Bansal, Carlos Castillo, Rajeev Ranjan, Rama Chellappa
While the research community appears to have developed a consensus on the methods of acquiring annotated data, design and training of CNNs, many questions still remain to be answered.
no code implementations • 15 Feb 2017 • Navaneeth Bodla, Jingxiao Zheng, Hongyu Xu, Jun-Cheng Chen, Carlos Castillo, Rama Chellappa
Thus, in this work, we propose a deep heterogeneous feature fusion network to exploit the complementary information present in features generated by different deep convolutional neural networks (DCNNs) for template-based face recognition, where a template refers to a set of still face images or video frames from different sources which introduces more blur, pose, illumination and other variations than traditional face datasets.
no code implementations • 9 Jan 2017 • Carlos Castillo, Soham De, Xintong Han, Bharat Singh, Abhay Kumar Yadav, Tom Goldstein
This work considers targeted style transfer, in which the style of a template image is used to alter only part of a target image.
no code implementations • 6 Nov 2016 • Connor J. Parde, Carlos Castillo, Matthew Q. Hill, Y. Ivette Colon, Swami Sankaranarayanan, Jun-Cheng Chen, Alice J. O'Toole
The results show that the DCNN features contain surprisingly accurate information about the yaw and pitch of a face, and about whether the face came from a still image or a video frame.
1 code implementation • 4 Nov 2016 • Ankan Bansal, Anirudh Nanduri, Carlos Castillo, Rajeev Ranjan, Rama Chellappa
Recent progress in face detection (including keypoint detection), and recognition is mainly being driven by (i) deeper convolutional neural network architectures, and (ii) larger datasets.
no code implementations • 6 Oct 2016 • Muhammad Imran, Sanjay Chawla, Carlos Castillo
An emerging challenge in the online classification of social media data streams is to keep the categories used for classification up-to-date.
1 code implementation • 31 May 2016 • Sohil Shah, Abhay Kumar, Carlos Castillo, David Jacobs, Christoph Studer, Tom Goldstein
We propose a general framework to approximately solve large-scale semidefinite problems (SDPs) at low complexity.
1 code implementation • LREC 2016 • Muhammad Imran, Prasenjit Mitra, Carlos Castillo
Microblogging platforms such as Twitter provide active communication channels during mass convergence and emergency events such as earthquakes, typhoons.
2 code implementations • 19 Apr 2016 • Swami Sankaranarayanan, Azadeh Alavi, Carlos Castillo, Rama Chellappa
Despite significant progress made over the past twenty five years, unconstrained face verification remains a challenging problem.
Ranked #11 on Face Verification on IJB-A
no code implementations • 29 Sep 2014 • Yelena Mejova, Amy X. Zhang, Nicholas Diakopoulos, Carlos Castillo
We find that in general, when it comes to controversial issues, the use of negative affect and biased language is prevalent, while the use of strong emotion is tempered.
no code implementations • 21 Oct 2013 • Muhammad Imran, Ioanna Lykourentzou, Yannick Naudet, Carlos Castillo
A crowdsourced stream processing system (CSP) is a system that incorporates crowdsourced tasks in the processing of a data stream.
no code implementations • 18 Jul 2013 • Carlos Castillo, Gianmarco De Francisci Morales, Marcelo Mendoza, Nasir Khan
We perform an automatic analysis of television news programs, based on the closed captions that accompany them.