COPPINI, Fabio; JIANG, Yiye; TABTI, Sonia

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COPPINI, Fabio
Laboratoire de Probabilités, Statistique et Modélisation [LPSM (UMR_8001)]

JIANG, Yiye
Institut de Mathématiques de Bordeaux [IMB]

TABTI, Sonia

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2021-04-28

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This report is concerned by one project done during the Semaine d'Études Mathématiques et Entreprises (SEME) at the Institut de Mathématiques de Bordeaux. The subject, proposed by the company FieldBox.ai, concerns the use of machine learning algorithms and data augmentation techniques, applied to small datasets composed of 1D signals measurements. The target variable is supposed to be continuous, i.e., a regression problem. By first reviewing the literature and existing methods on data augmentation, we propose two procedures to tackle this problem: one allows to create synthetic observations for a specific range of target values and it is based on a perturbation method in Fourier/Wavelet space; the other is based on neural networks and uses a particular version of the Variational Autoencoder known as LSTM-VAE. Our methods are applied to an open dataset, available at the UCI repository, and show encouraging results for a common class of machine learning algorithms.< Leer menos

Palabras clave en inglés

small-data

machine learning

inferring techniques

data augmentation

imputation

Variational Autoencoder

LSTM

Fast Fourier Transform

Discrete Wavelet Transform

time series

class imbalance

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Predictive models on 1D signals in a small-data environment

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