Search Results for author: David Atienza

Found 24 papers, 10 papers with code

Synthetic Epileptic Brain Activities Using Generative Adversarial Networks

1 code implementation22 Jul 2019 Damian Pascual, Amir Aminifar, David Atienza, Philippe Ryvlin, Roger Wattenhofer

In this work, we generate synthetic seizure-like brain electrical activities, i. e., EEG signals, that can be used to train seizure detection algorithms, alleviating the need for recorded data.

EEG Generative Adversarial Network +1

Interpreting Deep Learning Models for Epileptic Seizure Detection on EEG signals

no code implementations22 Dec 2020 Valentin Gabeff, Tomas Teijeiro, Marina Zapater, Leila Cammoun, Sylvain Rheims, Philippe Ryvlin, David Atienza

Specifically, we focused the discussion on three main aspects: 1) how to aggregate the classification results on signal segments provided by the DL model into a larger time scale, at the seizure-level; 2) what are the relevant frequency patterns learned in the first convolutional layer of different models, and their relation with the delta, theta, alpha, beta and gamma frequency bands on which the visual interpretation of EEG is based; and 3) the identification of the signal waveforms with larger contribution towards the ictal class, according to the activation differences highlighted using the DeepLIFT method.

EEG Seizure Detection

The RECIPE Approach to Challenges in Deeply Heterogeneous High Performance Systems

no code implementations4 Mar 2021 Giovanni Agosta, William Fornaciari, David Atienza, Ramon Canal, Alessandro Cilardo, José Flich Cardo, Carles Hernandez Luz, Michal Kulczewski, Giuseppe Massari, Rafael Tornero Gavilá, Marina Zapater

RECIPE (REliable power and time-ConstraInts-aware Predictive management of heterogeneous Exascale systems) is a recently started project funded within the H2020 FETHPC programme, which is expressly targeted at exploring new High-Performance Computing (HPC) technologies.

Weather Forecasting Distributed, Parallel, and Cluster Computing

Systematic Assessment of Hyperdimensional Computing for Epileptic Seizure Detection

1 code implementation3 May 2021 Una Pale, Tomas Teijeiro, David Atienza

Furthermore, we evaluate a post-processing strategy to adjust the predictions to the dynamics of epileptic seizures, showing that performance is significantly improved in all the approaches and also that after post-processing, differences in performance are much smaller between approaches.

Seizure Detection

Wearable and Continuous Prediction of Passage of Time Perception for Monitoring Mental Health

no code implementations3 May 2021 Lara Orlandic, Adriana Arza Valdes, David Atienza

Next, we classify each individual's POTP regardless of the task at hand, achieving an F-1 score of 77. 1% when distinguishing time passing faster rather than slower than usual.

ReBeatICG: Real-time Low-Complexity Beat-to-beat Impedance Cardiogram Delineation Algorithm

no code implementations4 May 2021 Una Pale, Nathan Müller, Adriana Arza, David Atienza

It achieves a detection Gmean accuracy of 94. 9%, 98. 6%, 90. 3%, and 84. 3% for the B, C, X, and O points, respectively.

An Error-Based Approximation Sensing Circuit for Event-Triggered, Low Power Wearable Sensors

no code implementations25 Jun 2021 Silvio Zanoli, Flavio Ponzina, Tomás Teijeiro, Alexandre Levisse, David Atienza

At the same time, multi-channel signals (like the six-dimensional accelerometer signal) can still benefit from the designed circuit, achieving a reduction factor up to 80% with minor performance degradation.

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

Multi-Centroid Hyperdimensional Computing Approach for Epileptic Seizure Detection

1 code implementation16 Nov 2021 Una Pale, Tomas Teijeiro, David Atienza

At the same time, the total number of sub-classes is not significantly increased compared to the balanced dataset.

EEG Seizure Detection

Adaptive R-Peak Detection on Wearable ECG Sensors for High-Intensity Exercise

1 code implementation8 Dec 2021 Elisabetta De Giovanni, Tomas Teijeiro, Grégoire P. Millet, David Atienza

Additionally, the online adaptive process achieves an F1 score of 99% across five different exercise intensities, with a total energy consumption of 1. 55+-0. 54~mJ.

Total Energy

Exploration of Hyperdimensional Computing Strategies for Enhanced Learning on Epileptic Seizure Detection

1 code implementation24 Jan 2022 Una Pale, Tomas Teijeiro, David Atienza

Yet, most of them have not been tested on the challenging task of epileptic seizure detection, and it stays unclear whether they can increase the HD computing performance to the level of the current state-of-the-art algorithms, such as random forests.

EEG Seizure Detection

Hyperdimensional computing encoding for feature selection on the use case of epileptic seizure detection

no code implementations16 May 2022 Una Pale, Tomas Teijeiro, David Atienza

As a result, we believe it can support the ML community to further foster the research in multiple directions related to feature and channel selection, as well as model interpretability.

EEG feature selection +1

Event-based sampled ECG morphology reconstruction through self-similarity

no code implementations5 Jul 2022 Silvio Zanoli, Tomas Teijeiro, Giovanni Ansaloni, David Atienza

In this work, we leverage the self-similarity of the electrocardiogram (ECG) signal to recover missing features in event-based sampled ECG signals, dynamically selecting patient-representative templates together with a novel dynamic time warping algorithm to infer the morphology of event-based sampled heartbeats.

Dynamic Time Warping

A Semi-Supervised Algorithm for Improving the Consistency of Crowdsourced Datasets: The COVID-19 Case Study on Respiratory Disorder Classification

no code implementations9 Sep 2022 Lara Orlandic, Tomas Teijeiro, David Atienza

In this work, we use a semi-supervised learning (SSL) approach to improve the labeling consistency of the COUGHVID dataset and the robustness of COVID-19 versus healthy cough sound classification.

Sound Classification

Importance of methodological choices in data manipulation for validating epileptic seizure detection models

no code implementations21 Feb 2023 Una Pale, Tomas Teijeiro, David Atienza

Epilepsy is a chronic neurological disorder that affects a significant portion of the human population and imposes serious risks in the daily life of patients.

Seizure Detection

Combining General and Personalized Models for Epilepsy Detection with Hyperdimensional Computing

no code implementations26 Mar 2023 Una Pale, Tomas Teijeiro, David Atienza

In this work, we demonstrate a few additional aspects in which HD computing, and the way its models are built and stored, can be used for further understanding, comparing, and creating more advanced machine learning models for epilepsy detection.

Transfer Learning

Robust and IP-Protecting Vertical Federated Learning against Unexpected Quitting of Parties

no code implementations28 Mar 2023 Jingwei Sun, Zhixu Du, Anna Dai, Saleh Baghersalimi, Alireza Amirshahi, David Atienza, Yiran Chen

In this paper, we propose \textbf{Party-wise Dropout} to improve the VFL model's robustness against the unexpected exit of passive parties and a defense method called \textbf{DIMIP} to protect the active party's IP in the deployment phase.

Vertical Federated Learning

Accelerator-driven Data Arrangement to Minimize Transformers Run-time on Multi-core Architectures

1 code implementation20 Dec 2023 Alireza Amirshahi, Giovanni Ansaloni, David Atienza

Additionally, we address the overhead of non-GEMM operations in transformer models within the scope of this memory data arrangement.

TEE4EHR: Transformer Event Encoder for Better Representation Learning in Electronic Health Records

1 code implementation9 Feb 2024 Hojjat Karami, David Atienza, Anisoara Ionescu

Furthermore, our results demonstrate that our approach can improve representation learning in EHRs and can be useful for clinical prediction tasks.

Representation Learning Self-Supervised Learning +1

TimEHR: Image-based Time Series Generation for Electronic Health Records

1 code implementation9 Feb 2024 Hojjat Karami, Mary-Anne Hartley, David Atienza, Anisoara Ionescu

Time series in Electronic Health Records (EHRs) present unique challenges for generative models, such as irregular sampling, missing values, and high dimensionality.

Generative Adversarial Network Time Series +1

SzCORE: A Seizure Community Open-source Research Evaluation framework for the validation of EEG-based automated seizure detection algorithms

3 code implementations20 Feb 2024 Jonathan Dan, Una Pale, Alireza Amirshahi, William Cappelletti, Thorir Mar Ingolfsson, Xiaying Wang, Andrea Cossettini, Adriano Bernini, Luca Benini, Sándor Beniczky, David Atienza, Philippe Ryvlin

Based on existing guidelines and recommendations, the framework introduces a set of recommendations and standards related to datasets, file formats, EEG data input content, seizure annotation input and output, cross-validation strategies, and performance metrics.

EEG Seizure Detection

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