“…Nature-derived algorithms are the most powerful algorithms for optimization. Recently, swarm intelligence [26], the biologically inspired algorithms, have been studied dramatically, such as firefly swarm optimization algorithm [14], ant colony optimization technique [27], particle swarm optimization (PSO) algorithm [28], artificial fish swarm optimization algorithm [29], and swallow swarm optimization (SSO) [30]. They have been applied to solve various problems, such as healthcare, finance, energy, image thresholding, and others.…”