Search Results for author: Jose A. Lozano

Found 20 papers, 8 papers with code

Uncertainty-Aware Explanations Through Probabilistic Self-Explainable Neural Networks

no code implementations20 Mar 2024 Jon Vadillo, Roberto Santana, Jose A. Lozano, Marta Kwiatkowska

The lack of transparency of Deep Neural Networks continues to be a limitation that severely undermines their reliability and usage in high-stakes applications.

valid

Time-dependent Probabilistic Generative Models for Disease Progression

no code implementations15 Nov 2023 Onintze Zaballa, Aritz Pérez, Elisa Gómez-Inhiesto, Teresa Acaiturri-Ayesta, Jose A. Lozano

We propose a Markovian generative model of treatments developed to (i) model the irregular time intervals between medical events; (ii) classify treatments into subtypes based on the patient sequence of medical events and the time intervals between them; and (iii) segment treatments into subsequences of disease progression patterns.

Minimax Forward and Backward Learning of Evolving Tasks with Performance Guarantees

1 code implementation NeurIPS 2023 Verónica Álvarez, Santiago Mazuelas, Jose A. Lozano

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.

Continual Learning Incremental Learning

Uncertainty in Fairness Assessment: Maintaining Stable Conclusions Despite Fluctuations

no code implementations2 Feb 2023 Ainhize Barrainkua, Paula Gordaliza, Jose A. Lozano, Novi Quadrianto

Several recent works encourage the use of a Bayesian framework when assessing performance and fairness metrics of a classification algorithm in a supervised setting.

Fairness Informativeness

A Survey on Preserving Fairness Guarantees in Changing Environments

no code implementations14 Nov 2022 Ainhize Barrainkua, Paula Gordaliza, Jose A. Lozano, Novi Quadrianto

Human lives are increasingly being affected by the outcomes of automated decision-making systems and it is essential for the latter to be, not only accurate, but also fair.

Benchmarking Decision Making +1

Minimax Classification under Concept Drift with Multidimensional Adaptation and Performance Guarantees

1 code implementation31 May 2022 Verónica Álvarez, Santiago Mazuelas, Jose A. Lozano

The statistical characteristics of instance-label pairs often change with time in practical scenarios of supervised classification.

When and How to Fool Explainable Models (and Humans) with Adversarial Examples

1 code implementation5 Jul 2021 Jon Vadillo, Roberto Santana, Jose A. Lozano

Reliable deployment of machine learning models such as neural networks continues to be challenging due to several limitations.

BIG-bench Machine Learning Explainable Models

Analysis of Dominant Classes in Universal Adversarial Perturbations

no code implementations28 Dec 2020 Jon Vadillo, Roberto Santana, Jose A. Lozano

The reasons why Deep Neural Networks are susceptible to being fooled by adversarial examples remains an open discussion.

A revisited branch-and-cut algorithm for large-scale orienteering problems

1 code implementation5 Nov 2020 Gorka Kobeaga, María Merino, Jose A. Lozano

We propose a revisited version of the branch-and-cut algorithm for the orienteering problem which includes new contributions in the separation algorithms of inequalities stemming from the cycle problem, in the separation loop, in the variables pricing, and in the calculation of the lower and upper bounds of the problem.

Optimization and Control Data Structures and Algorithms

On Solving Cycle Problems with Branch-and-Cut: Extending Shrinking and Exact Subcycle Elimination Separation Algorithms

1 code implementation30 Apr 2020 Gorka Kobeaga, María Merino, Jose A. Lozano

Particularly, we study the shrinking of support graphs and the exact algorithms for subcycle elimination separation problems.

Data Structures and Algorithms Combinatorics 05C38, 90C10, 90C57

Extending Adversarial Attacks to Produce Adversarial Class Probability Distributions

1 code implementation14 Apr 2020 Jon Vadillo, Roberto Santana, Jose A. Lozano

Despite the remarkable performance and generalization levels of deep learning models in a wide range of artificial intelligence tasks, it has been demonstrated that these models can be easily fooled by the addition of imperceptible yet malicious perturbations to natural inputs.

Adversarial Attack Emotion Classification

A review on outlier/anomaly detection in time series data

no code implementations11 Feb 2020 Ane Blázquez-García, Angel Conde, Usue Mori, Jose A. Lozano

Recent advances in technology have brought major breakthroughs in data collection, enabling a large amount of data to be gathered over time and thus generating time series.

Anomaly Detection Outlier Detection +2

Evolving Gaussian Process kernels from elementary mathematical expressions

no code implementations11 Oct 2019 Ibai Roman, Roberto Santana, Alexander Mendiburu, Jose A. Lozano

Gaussian Process is a state-of-the-art technique for regression and classification that heavily relies on a kernel function.

Time Series Time Series Analysis

Sentiment analysis with genetically evolved Gaussian kernels

no code implementations1 Apr 2019 Ibai Roman, Alexander Mendiburu, Roberto Santana, Jose A. Lozano

Our results show that the algorithm can outperform Gaussian Processes with traditional kernels for some of the sentiment analysis tasks considered.

Gaussian Processes Sentiment Analysis

A data-driven approach to precipitation parameterizations using convolutional encoder-decoder neural networks

2 code implementations25 Mar 2019 Pablo Rozas Larraondo, Luigi J. Renzullo, Inaki Inza, Jose A. Lozano

Numerical Weather Prediction (NWP) models represent sub-grid processes using parameterizations, which are often complex and a major source of uncertainty in weather forecasting.

Atmospheric and Oceanic Physics 86-08 I.4.9; I.6.6; J.2

Merge Non-Dominated Sorting Algorithm for Many-Objective Optimization

1 code implementation17 Sep 2018 Javier Moreno, Daniel Rodriguez, Antonio Nebro, Jose A. Lozano

Many Pareto-based multi-objective evolutionary algorithms require to rank the solutions of the population in each iteration according to the dominance principle, what can become a costly operation particularly in the case of dealing with many-objective optimization problems.

Evolutionary Algorithms

A review on distance based time series classification

no code implementations12 Jun 2018 Amaia Abanda, Usue Mori, Jose A. Lozano

The particularity of the data makes it a challenging task and different approaches have been taken, including the distance based approach.

Classification General Classification +3

An efficient K -means clustering algorithm for massive data

no code implementations9 Jan 2018 Marco Capó, Aritz Pérez, Jose A. Lozano

The analysis of continously larger datasets is a task of major importance in a wide variety of scientific fields.

Clustering

Towards Competitive Classifiers for Unbalanced Classification Problems: A Study on the Performance Scores

no code implementations31 Aug 2016 Jonathan Ortigosa-Hernández, Iñaki Inza, Jose A. Lozano

We conclude that using unweighted H\"older means with exponent $p \leq 1$ to average the recalls of all the classes produces adequate scores which are capable of determining whether a classifier is competitive.

General Classification

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