Machine Learning
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Fast Computation of Cluster Validity Measures for Bregman Divergences and Benefits
(2023)Partitional clustering is one of the most relevant unsupervised learning and pattern recognition techniques. Unfortunately, one of the main drawbacks of these methodologies refer to the fact that the number of clusters is ... 
Fast KMedoids With the l_1Norm
(20230726)Kmedoids clustering is one of the most popular techniques in exploratory data analysis. The most commonly used algorithms to deal with this problem are quadratic on the number of instances, n, and usually the quality of ... 
Minimax Forward and Backward Learning of Evolving Tasks with Performance Guarantees
(202312)For a sequence of classification tasks that arrive over time, it is common that tasks are evolving in the sense that consecutive tasks often have a higher similarity. The incremental learning of a growing sequence of ... 
Largescale unsupervised spatiotemporal semantic analysis of vast regions from satellite images sequences
(2024)Temporal sequences of satellite images constitute a highly valuable and abundant resource for analyzing regions of interest. However, the automatic acquisition of knowledge on a large scale is a challenging task due to ... 
SpeedingUp Evolutionary Algorithms to Solve BlackBox Optimization Problems
(20240110)Populationbased evolutionary algorithms are often considered when approaching computationally expensive blackbox optimization problems. They employ a selection mechanism to choose the best solutions from a given population ... 
DoubleWeighting for Covariate Shift Adaptation
(202307)Supervised learning is often affected by a covariate shift in which the marginal distributions of instances (covariates $x$) of training and testing samples $p_\text{tr}(x)$ and $p_\text{te}(x)$ are different but the label ... 
On the Use of Second Order Neighbors to Escape from Local Optima
(20230712)Designing efficient local search based algorithms requires to consider the specific properties of the problems. We introduce a simple and effi cient strategy, the Extended Reach, that escapes from local optima ob tained ... 
MinimumFuel LowThrust Trajectory Optimization Via a Direct Adaptive Evolutionary Approach
(20231128)Space missions with lowthrust propulsion systems are of appreciable interest to space agencies because of their practicality due to higher specific impulses. This research proposes a technique to the solution of minimumfuel ... 
Adaptive Estimation of Distribution Algorithms for LowThrust Trajectory Optimization
(20230802)A direct adaptive scheme is presented as an alternative approach for minimumfuel lowthrust trajectory design in noncoplanar orbit transfers, utilizing fitness landscape analysis (FLA). Spacecraft dynamics is modeled ... 
Robust Estimation of Distribution Algorithms via Fitness Landscape Analysis for Optimal LowThrust Orbital Maneuvers
(202309)One particular kind of evolutionary algorithms known as Estimation of Distribution Algorithms (EDAs) has gained the attention of the aerospace industry for its ability to solve nonlinear and complicated problems, particularly ... 
Learning a logistic regression with the help of unknown features at prediction stage
(2023)The use of features available at training time, but not at prediction time, as additional information for training models is known as learning using privileged information paradigm. In this paper, the handling of ... 
Female Models in AI and the Fight Against COVID19
(20221101)Gender imbalance has persisted over time and is well documented in science, technology, engineering and mathematics (STEM) and singularly in artificial intelligence (AI). In this article we emphasize the importance of ... 
Efficient Learning of Minimax Risk Classifiers in High Dimensions
(20230801)Highdimensional data is common in multiple areas, such as health care and genomics, where the number of features can be tens of thousands. In such scenarios, the large number of features often leads to inefficient ... 
LASSO for streaming data with adaptative filtering
(2022)Streaming data is ubiquitous in modern machine learning, and so the development of scalable algorithms to analyze this sort of information is a topic of current interest. On the other hand, the problem of l1penalized ... 
Are the statistical tests the best way to deal with the biomarker selection problem?
(2022)Statistical tests are a powerful set of tools when applied correctly, but unfortunately the extended misuse of them has caused great concern. Among many other applications, they are used in the detection of biomarkers so ... 
On the use of the descriptive variable for enhancing the aggregation of crowdsourced labels
(2022)The use of crowdsourcing for annotating data has become a popular and cheap alternative to expert labelling. As a consequence, an aggregation task is required to combine the different labels provided and agree on a single ... 
On the relative value of weak information of supervision for learning generative models: An empirical study
(2022)Weakly supervised learning is aimed to learn predictive models from partially supervised data, an easytocollect alternative to the costly standard full supervision. During the last decade, the research community has ... 
Comparing Two Samples Through Stochastic Dominance: A Graphical Approach
(2022)Nondeterministic measurements are common in realworld scenarios: the performance of a stochastic optimization algorithm or the total reward of a reinforcement learning agent in a chaotic environment are just two examples ...