[Retracted] Design and Application of BP Neural Network Optimization Method Based on SIWSPSO Algorithm

Table 1

Classification of risk occurrence possibility.

Level	Feature description	Assignment
Very low	(0～20%)	(0～1)
Low	(20～40%)	(1～2)
Medium	(40～60%)	(2～3)
High	(60～80%)	(3～4)
Very high	(80%～100%)	(4～5)