“…Other EC techniques have also been applied to feature selection, mainly including LCSs, ES, ABC, AISs, GSAs, EDAs, TS, and SA. Some of them were combined with other EC techniques [38], [53], [139] while most were applied individually to address feature selection problems [232], [54], [56], [79], [152], [220], [221], [222], [224], [225], [226]. Almost all of them are wrapper based methods.…”