A Study of Artificial Neural Network Training Algorithms for Classification of Cardiotocography Signals

Year 2017, Volume: 7 Issue: 2, 93 - 103, 26.12.2017

Zafer Cömert , Adnan Kocamaz

https://doi.org/10.17678/beuscitech.338085

Cited By: 47

Abstract

Cardiotocography (CTG) that
contains fetal heart rate (FHR) and uterine contraction (UC) signals is a
monitoring technique. During the last decades, FHR signals have been classified
as normal, suspicious, and pathological using machine learning techniques. As a
classifier, artificial neural network (ANN) is notable due to its powerful
capabilities. For this reason, behaviors and performances of neural network
training algorithms were investigated and compared on classification task of
the CTG traces in this study. Training algorithms of neural network were
categorized in five group as Gradient Descent, Resilient Backpropagation,
Conjugate Gradient, Quasi-Newton, and Levenberg-Marquardt. Two different experimental
setups were performed during the training and test stages to achieve more
generalized results. Furthermore, several evaluation parameters, such as accuracy
(ACC), sensitivity (Se), specificity (Sp), and geometric mean (GM), were taken
into account during performance comparison of the algorithms. An open access CTG
dataset containing 2126 instances with 21 features and located under UCI
Machine Learning Repository was used in this study. According to results of
this study, all training algorithms produced rather satisfactory results. In
addition, the best classification performances were obtained with
Levenberg-Marquardt backpropagation (LM) and Resilient Backpropagation (RP) algorithms.
The GM values of RP and LM were obtained as 89.69% and 86.14%, respectively. Consequently,
this study confirms that ANN is a useful machine learning tool to classify FHR
recordings.

Keywords

Biomedical Signal Processing, Fetal Heart Rate, Artificial Neural Network, Training Algorithm, Classification

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