Search Results for author: Concha Bielza

Found 10 papers, 3 papers with code

Classifying the evolution of COVID-19 severity on patients with combined dynamic Bayesian networks and neural networks

no code implementations10 Mar 2023 David Quesada, Pedro Larrañaga, Concha Bielza

When we face patients arriving to a hospital suffering from the effects of some illness, one of the main problems we can encounter is evaluating whether or not said patients are going to require intensive care in the near future.

Context-specific kernel-based hidden Markov model for time series analysis

1 code implementation24 Jan 2023 Carlos Puerto-Santana, Concha Bielza, Pedro Larrañaga, Gustav Eje Henter

Traditional hidden Markov models have been a useful tool to understand and model stochastic dynamic data; in the case of non-Gaussian data, models such as mixture of Gaussian hidden Markov models can be used.

Density Estimation Time Series +1

Quantum Approximate Optimization Algorithm for Bayesian network structure learning

1 code implementation4 Mar 2022 Vicente P. Soloviev, Concha Bielza, Pedro Larrañaga

The approach was applied to a cancer benchmark problem, and the results justified the use of variational quantum algorithms for solving the Bayesian network structure learning problem.

Semiparametric Bayesian Networks

2 code implementations7 Sep 2021 David Atienza, Concha Bielza, Pedro Larrañaga

In addition, we present modifications of two well-known algorithms (greedy hill-climbing and PC) to learn the structure of a semiparametric Bayesian network from data.

Density Estimation

Autoregressive Asymmetric Linear Gaussian Hidden Markov Models

no code implementations27 Oct 2020 Carlos Puerto-Santana, Pedro Larrañaga, Concha Bielza

In a real life process evolving over time, the relationship between its relevant variables may change.

Sparse Cholesky covariance parametrization for recovering latent structure in ordered data

no code implementations2 Jun 2020 Irene Córdoba, Concha Bielza, Pedro Larrañaga, Gherardo Varando

The sparse Cholesky parametrization of the inverse covariance matrix can be interpreted as a Gaussian Bayesian network; however its counterpart, the covariance Cholesky factor, has received, with few notable exceptions, little attention so far, despite having a natural interpretation as a hidden variable model for ordered signal data.

Towards Gaussian Bayesian Network Fusion

no code implementations1 Dec 2018 Irene Córdoba, Concha Bielza, Pedro Larrañaga

In this paper we propose a method for the aggregation of different Bayesian network structures that have been learned from separate data sets, as a first step towards mining data sets that need to be partitioned in an horizontal way, i. e. with respect to the instances, in order to be processed.

Markov Property in Generative Classifiers

no code implementations12 Nov 2018 Gherardo Varando, Concha Bielza, Pedro Larrañaga, Eva Riccomagno

We show that, for generative classifiers, conditional independence corresponds to linear constraints for the induced discrimination functions.

Bayesian optimization of the PC algorithm for learning Gaussian Bayesian networks

no code implementations28 Jun 2018 Irene Córdoba, Eduardo C. Garrido-Merchán, Daniel Hernández-Lobato, Concha Bielza, Pedro Larrañaga

We show that the parameters found by a BO method outperform those found by a random search strategy and the expert recommendation.

Bayesian Optimization

A review of Gaussian Markov models for conditional independence

no code implementations23 Jun 2016 Irene Córdoba, Concha Bielza, Pedro Larrañaga

Markov models lie at the interface between statistical independence in a probability distribution and graph separation properties.

Model Selection Two-sample testing

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