Search Results for author: João Pereira

Found 7 papers, 0 papers with code

Probabilistic Demand Forecasting with Graph Neural Networks

no code implementations23 Jan 2024 Nikita Kozodoi, Elizaveta Zinovyeva, Simon Valentin, João Pereira, Rodrigo Agundez

We also show that our approach produces article embeddings that encode article similarity and demand dynamics and are useful for other downstream business tasks beyond forecasting.

Attribute Decision Making +1

Covered Information Disentanglement: Model Transparency via Unbiased Permutation Importance

no code implementations18 Nov 2021 João Pereira, Erik S. G. Stroes, Aeilko H. Zwinderman, Evgeni Levin

One of the most popular approaches to explain model global predictions is the permutation importance where the performance on permuted data is benchmarked against the baseline.

Disentanglement

Interpretable Models via Pairwise permutations algorithm

no code implementations17 Nov 2021 Troy Maaslandand, João Pereira, Diogo Bastos, Marcus de Goffau, Max Nieuwdorp, Aeilko H. Zwinderman, Evgeni Levin

One of the most common pitfalls often found in high dimensional biological data sets are correlations between the features.

Feature Importance

Unsupervised Representation Learning and Anomaly Detection in ECG Sequences

no code implementations1 Aug 2019 João Pereira, Margarida Silveira

Unsupervised representation learning using deep generative models (e. g., variational autoencoders) has been used to learn expressive feature representations of sequences that can make downstream tasks, such as anomaly detection, easier to execute and more accurate.

Anomaly Detection Clustering +4

Graph Space Embedding

no code implementations31 Jul 2019 João Pereira, Albert Groen, Erik Stroes, Evgeni Levin

We propose the Graph Space Embedding (GSE), a technique that maps the input into a space where interactions are implicitly encoded, with little computations required.

Learning Representations from Healthcare Time Series Data for Unsupervised Anomaly Detection

no code implementations 2019 IEEE International Conference on Big Data and Smart Computing (BigComp) 2019 João Pereira, Margarida Silveira

Our results on the publicly available ECG5000 electrocardiogram dataset show the ability of the proposed approach to detect anomalous heartbeats in a fully unsupervised fashion, while providing structured and expressive data representations.

Clustering Outlier Detection +4

Unsupervised Anomaly Detection in Energy Time Series Data Using Variational Recurrent Autoencoders with Attention

no code implementations17 Dec 2018 João Pereira, Margarida Silveira

In this paper, we propose a generic, unsupervised and scalable framework for anomaly detection in time series data, based on a variational recurrent autoencoder.

Deep Attention Representation Learning +3

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