A Multiswarm Optimizer for Distributed Decision Making in Virtual Enterprise Risk Management

Table 2

List of variables used in PS²O.

𝑀	The number of swarms
𝑁	Population size of each swarm
𝑘	Swarm’s ID counter from 1 to 𝑛
𝑖	Individual’s ID counter from 1 to 𝑚
𝑑	Dimension of the problem
𝑡	Generation counter from 1 to max generation
𝜃	The index of the best neighbor swarm of the 𝑘th swarm
𝑥^𝑘𝑖𝑑	The 𝑖th individual’s (of the 𝑘th swarm) 𝑑th dimension’s value
𝑝^𝑘𝑖𝑑	The 𝑖th individual’s personal best (of the 𝑘th swarm)
𝑝^𝑘𝑔𝑑	The best neighbor position of 𝑥^𝑘𝑖𝑑 in the 𝑘th swarm
𝑝^𝜃𝑔𝑑	The best neighbor position of the 𝑘th swarm