[Retracted] Intelligent Optimal Control of Sewage Treatment Based on Multiobjective Evolutionary Algorithm

Table 2

Comparison of IGD indicators.

Problem	Index	NSGA-II	MOEA/D	SS-MOEA/D
ZDT1	IGD
	Sort	1	3	2
ZDT2	IGD
	Sort	3	2	1
ZDT3	IGD