Search Results for author: Aritz Pérez

Found 13 papers, 6 papers with code

PAC-Bayes-Chernoff bounds for unbounded losses

no code implementations2 Jan 2024 Ioar Casado, Luis A. Ortega, Andrés R. Masegosa, Aritz Pérez

This result can be understood as a PAC-Bayesian version of the Cram\'er-Chernoff bound.

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.

Speeding-up Evolutionary Algorithms to solve Black-Box Optimization Problems

1 code implementation23 Sep 2023 Judith Echevarrieta, Etor Arza, Aritz Pérez

However, these algorithms require a large number of evaluations to provide a quality solution, which might be computationally expensive when the evaluation cost is high.

Evolutionary Algorithms

Efficient Learning of Minimax Risk Classifiers in High Dimensions

1 code implementation11 Jun 2023 Kartheek Bondugula, Santiago Mazuelas, Aritz Pérez

High-dimensional data is common in multiple areas, such as health care and genomics, where the number of features can be tens of thousands.

feature selection

Dirichlet process mixture models for non-stationary data streams

no code implementations13 Oct 2022 Ioar Casado, Aritz Pérez

In recent years, we have seen a handful of work on inference algorithms over non-stationary data streams.

Clustering Density Estimation +1

Large-scale unsupervised spatio-temporal semantic analysis of vast regions from satellite images sequences

no code implementations29 Aug 2022 Carlos Echegoyen, Aritz Pérez, Guzmán Santafé, Unai Pérez-Goya, María Dolores Ugarte

In this context, we present a fully unsupervised and general methodology to conduct spatio-temporal taxonomies of large regions from sequences of satellite images.

Temporal Sequences Time Series +1

Comparing Two Samples Through Stochastic Dominance: A Graphical Approach

1 code implementation15 Mar 2022 Etor Arza, Josu Ceberio, Ekhiñe Irurozki, Aritz Pérez

Non-deterministic measurements are common in real-world 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 in which unpredictable outcomes are common.

Stochastic Optimization Vocal Bursts Valence Prediction

MRCpy: A Library for Minimax Risk Classifiers

1 code implementation4 Aug 2021 Kartheek Bondugula, Verónica Álvarez, José I. Segovia-Martín, Aritz Pérez, Santiago Mazuelas

MRCpy provides a unified interface for different variants of MRCs and follows the standards of popular Python libraries.

K-means for Evolving Data Streams

1 code implementation7 Dec 2020 Arkaitz Bidaurrazaga, Aritz Pérez, Marco Capó

In this paper, we formally define the Streaming $K$-means(S$K$M) problem, which implies a restart of the error function when a concept drift occurs.

Clustering

Generalized Maximum Entropy for Supervised Classification

1 code implementation10 Jul 2020 Santiago Mazuelas, Yuan Shen, Aritz Pérez

The maximum entropy principle advocates to evaluate events' probabilities using a distribution that maximizes entropy among those that satisfy certain expectations' constraints.

Classification General Classification

Candidate Labeling for Crowd Learning

no code implementations26 Apr 2018 Iker Beñaran-Muñoz, Jerónimo Hernández-González, Aritz Pérez

In this paper, the use of candidate labeling for crowd learning is proposed, where the annotators may provide more than a single label per instance to try not to miss the real label.

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

An efficient K-means algorithm for Massive Data

no code implementations10 May 2016 Marco Capó, Aritz Pérez, José Antonio Lozano

Due to the progressive growth of the amount of data available in a wide variety of scientific fields, it has become more difficult to ma- nipulate and analyze such information.

Clustering

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