Abstract
Ordinal regression considers classification problems where there exists a natural ordering among the categories. In this learning setting, thresholds models are one of the most used and successful techniques. On the other hand, liver transplantation is a widely-used treatment for patients with a terminal liver disease. This paper considers the survival time of the recipient to perform an appropriate donor-recipient matching, which is a highly imbalanced classification problem. An artificial neural network model applied to ordinal classification is used, combining evolutionary and gradient-descent algorithms to optimize its parameters, together with an ordinal over-sampling technique. The evolutionary algorithm applies a modified fitness function able to deal with the ordinal imbalanced nature of the dataset. The results show that the proposed model leads to competitive performance for this problem.
This work has been subsidized by the TIN2014-54583-C2-1-R project of the Spanish Ministerial Commission of Science and Technology (MICYT), FEDER funds and the P2011-TIC-7508 project of the “Junta de Andalucía” (Spain). The authors M. Dorado-Moreno, M. Pérez-Ortíz and M.D. Ayllón-Terán have contributed equally to the preparation of this paper.
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Dorado-Moreno, M., Pérez-Ortiz, M., Ayllón-Terán, M.D., Gutiérrez, P.A., Hervás-Martínez, C. (2016). Ordinal Evolutionary Artificial Neural Networks for Solving an Imbalanced Liver Transplantation Problem. In: Martínez-Álvarez, F., Troncoso, A., Quintián, H., Corchado, E. (eds) Hybrid Artificial Intelligent Systems. HAIS 2016. Lecture Notes in Computer Science(), vol 9648. Springer, Cham. https://doi.org/10.1007/978-3-319-32034-2_38
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