RT info:eu-repo/semantics/article T1 Ensemble methods and semi-supervised learning for information fusion: A review and future research directions A1 Garrido Labrador, José Luis A1 Serrano Mamolar, Ana A1 Maudes Raedo, Jesús M. A1 Rodríguez Diez, Juan José A1 García Osorio, César K1 Semi-supervised learning K1 Ensemble learning K1 Information fusion K1 Semi-supervised ensemble classification K1 Label scarcity K1 Bibliographic review K1 Research trends K1 Experimental protocols K1 Informática K1 Computer science AB Advances over the past decade at the intersection of information fusion methods and Semi-Supervised Learning (SSL) are investigated in this paper that grapple with challenges related to limited labelled data. To do so, a bibliographic review of papers published since 2013 is presented, in which ensemble methods are combined with new machine learning algorithms. A total of 128 new proposals using SSL algorithms for ensemble construction are identified and classified. All the methods are categorised by approach, ensemble type, and base classifier. Experimental protocols, pre-processing, dataset usage, unlabelled ratios, and statistical tests are also assessed, underlining the major trends, and some shortcomings of particular studies. It is evident from this literature review that foundational algorithms such as self-training and co-training are influencing current developments, and that innovative ensemble techniques are continuing to emerge. Additionally, valuable guidelines are identified in the review for improving research into intrinsically semi-supervised and unsupervised pre-processing methods, especially for regression tasks. PB Elsevier SN 1566-2535 YR 2024 FD 2024-07 LK http://hdl.handle.net/10259/8872 UL http://hdl.handle.net/10259/8872 LA eng NO This work was supported through the Junta de Castilla y León (JCyL) (regional goverment) under project BU055P20 (JCyL/FEDER, UE), the Spanish Ministry of Science and Innovation under project PID2020-119894GB-I00 co-financed through European Union FEDER funds, and project TED2021-129485B-C43 funded by MCIN/AEI/10.13039/501100011033 and the European Union NextGenerationEU/PRTR. J.L. Garrido-Labrador is supported through Consejería de Educación of the Junta de Castilla y León and the European Social Fund through a pre-doctoral grant EDU/875/2021 (Spain). DS Repositorio Institucional de la Universidad de Burgos RD 16-may-2024