“…Various general approaches to the aggregation of classifiers were already presented (e.g., in publications of Alsina et al, 2006 ; Beliakov et al, 2007 ; Grabisch et al, 2009 ; Calvo et al, 2012 ; Gągolewski, 2015 ; Dolecki et al, 2016 ; Baczyński et al, 2017 ). Recently, one of the dominant techniques is using the Choquet integral or its generalizations or extensions ( Kwak and Pedrycz, 2004 , 2005 ; Karczmarek et al, 2014 , 2017a , b , 2018 , 2019b ; Anderson et al, 2018 ; Rutkowska et al, 2020 ). In particular, recent studies on the so-called pre-aggregation functions offer hope for the development of this approach ( Lucca et al, 2015 , 2016 , 2017 ; Bustince et al, 2016 ; Dimuro et al, 2017 ; Dias et al, 2018 ).…”