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\subsection{Particle Swarm Optimization}  \label{s.pso}  Particle Swarm Optimization (PSO) is an algorithm modeled on swarm intelligence dynamics that finds a solution in a search space based on social behavior~\cite{2001}. Each possible solution (agent) is modeled as a particle in the swarm that imitates its neighborhood based on the values of the fitness function found so far.  \subsection{Bat Algorithm}  \label{s.ba}