7.3 ABC hybridizations 145
7.3.1 Hybrid ABC and least squares method
The proposed approach based on hybrid ABC optimization and weighted least squares
(LS) method was proposed in [19]. In some search spaces such as Takagi-Sugeno (TS)-
type model, part of the unknowns is linearly related to the output fitness and another
variable set is nonlinearly related to the fitness. In the work [19] ABC optimization
was used to optimize a set of nonlinearly related unknowns and given the ABC guess
an LS method is used to find the exact values of the rest of the variables and so on.
Thus the ABC is used for the nonlinear portions while LS is used to calculate the
nonlinear portions of the optimization problem and hence ensures high performance in
both accuracy and ...