no code implementations • 21 Apr 2024 • João Gama, Rita P. Ribeiro, Saulo Mastelini, Narjes Davarid, Bruno Veloso
The system can present global explanations for the black box model and local explanations for why the black box model predicts a failure.
no code implementations • 2 Apr 2024 • Matias Molina, Rita P. Ribeiro, Bruno Veloso, João Gama
Illegal landfills are a critical issue due to their environmental, economic, and public health impacts.
1 code implementation • 26 Mar 2024 • Pedro C. Vieira, João P. Montrezol, João T. Vieira, João Gama
We present S+t-SNE, an adaptation of the t-SNE algorithm designed to handle infinite data streams.
1 code implementation • 12 Feb 2024 • Teresa Salazar, João Gama, Helder Araújo, Pedro Henriques Abreu
In the evolving field of machine learning, ensuring fairness has become a critical concern, prompting the development of algorithms designed to mitigate discriminatory outcomes in decision-making processes.
no code implementations • 8 Jun 2023 • Sepideh Pashami, Slawomir Nowaczyk, Yuantao Fan, Jakub Jakubowski, Nuno Paiva, Narjes Davari, Szymon Bobek, Samaneh Jamshidi, Hamid Sarmadi, Abdallah Alabdallah, Rita P. Ribeiro, Bruno Veloso, Moamar Sayed-Mouchaweh, Lala Rajaoarisoa, Grzegorz J. Nalepa, João Gama
We provide an overview of predictive maintenance tasks and accentuate the need and varying purposes for corresponding explanations.
Explainable artificial intelligence Explainable Artificial Intelligence (XAI)
2 code implementations • 24 Nov 2022 • Sérgio Jesus, José Pombal, Duarte Alves, André Cruz, Pedro Saleiro, Rita P. Ribeiro, João Gama, Pedro Bizarro
The suite was generated by applying state-of-the-art tabular data generation techniques on an anonymized, real-world bank account opening fraud detection dataset.
no code implementations • 12 Jul 2022 • Bruno Veloso, João Gama, Rita P. Ribeiro, Pedro M. Pereira
The paper describes the MetroPT data set, an outcome of a eXplainable Predictive Maintenance (XPM) project with an urban metro public transportation service in Porto, Portugal.
no code implementations • 30 May 2022 • Rui Portocarrero Sarmento, Douglas O. Cardoso, João Gama, Pavel Brazdil
The results provide a new view for the contextualization of similarity when approaching flux of documents organization tasks, based on the similarity between documents in the flux, and by using mentioned algorithms.
no code implementations • 16 May 2022 • Paula Raissa Silva, João Vinagre, João Gama
This work complements the state-of-the-art by adapting the data stream algorithms in a federated learning setting for anomaly detection and by delivering a robust framework and demonstrating the practical feasibility in a real-world distributed deployment scenario.
no code implementations • 22 Oct 2021 • Douglas Castilho, Tharsis T. P. Souza, Soong Moon Kang, João Gama, André C. P. L. F. de Carvalho
For such, market structure is modeled as a dynamic asset network by quantifying time-dependent co-movement of asset price returns across company constituents of major global market indices.
no code implementations • 21 Jan 2021 • Sérgio Jesus, Catarina Belém, Vladimir Balayan, João Bento, Pedro Saleiro, Pedro Bizarro, João Gama
We conducted an experiment following XAI Test to evaluate three popular post-hoc explanation methods -- LIME, SHAP, and TreeInterpreter -- on a real-world fraud detection task, with real data, a deployed ML model, and fraud analysts.
Decision Making Explainable Artificial Intelligence (XAI) +1
no code implementations • 25 Sep 2019 • Thiago Andrade, Brais Cancela, João Gama
Many aspects of life are associated with places of human mobility patterns and nowadays we are facing an increase in the pervasiveness of mobile devices these individuals carry.
no code implementations • 9 Jul 2019 • Richard Hugh Moulton, Herna L. Viktor, Nathalie Japkowicz, João Gama
We conclude that the paradigm of contexts in data streams can be used to improve the performance of streaming one-class classifiers.
1 code implementation • 30 Apr 2019 • Brais Cancela, Verónica Bolón-Canedo, Amparo Alonso-Betanzos, João Gama
Classic feature selection techniques remove those features that are either irrelevant or redundant, achieving a subset of relevant features that help to provide a better knowledge extraction.
no code implementations • 19 Apr 2019 • Thiago Andrade, João Gama
Smartphones and portable devices have become ubiquitous and part of everyone's life.
1 code implementation • 13 Jun 2014 • Hadi Fanaee-T, João Gama
Experimental results on hundred sets of benchmark data reveals that EigenEvent presents a better overall performance comparing state-of-the-art, in particular in terms of the false alarm rate.
no code implementations • 13 Jun 2014 • Hadi Fanaee-T, João Gama
STScan makes some restrictive assumptions about the distribution of data, the shape of the hotspots and the quality of data, which can be unrealistic for some nontraditional data sources.
no code implementations • 12 Jun 2014 • Hadi Fanaee-T, Márcia D. B. Oliveira, João Gama, Simon Malinowski, Ricardo Morla
Among unsupervised approaches, Principal Component Analysis (PCA) is a well-known solution which has been widely used in the anomaly detection literature and can be applied to matrix data (e. g. Users-Features).
no code implementations • NeurIPS 2009 • Kuzman Ganchev, Ben Taskar, Fernando Pereira, João Gama
We apply this new method to learn first-order HMMs for unsupervised part-of-speech (POS) tagging, and show that HMMs learned this way consistently and significantly out-performs both EM-trained HMMs, and HMMs with a sparsity-inducing Dirichlet prior trained by variational EM.
1 code implementation • Advanced Data Mining and Applications, Second International Conference, ADMA 2006 • João Gama, Gladys Castillo
In this work we present experiments using the method as a wrapper over a decision tree and a linear model, and in each internal-node of a decision tree.