An Evolutionary Algorithm with Clustering-Based Assisted Selection Strategy for Multimodal Multiobjective Optimization

Algorithm 4

Algorithm 4: Deletion operator.

Output: P (updated population)
(1)	while | P | > N
(2)	normalize P
(3)	compute HAD values of solutions in P by equation (5)
(4)	find the most crowded subregion by equation (6)
(5)	divide all solutions in into S1, …, SK by equation (7)
(6)	find the most crowded cluster Sk by equation (8)
(7)	find x with the smallest HAD value in Sk
(8)	delete x from and P
(9)	end while
(10)	return P