Research on the Prediction of the Water Demand of Construction Engineering Based on the BP Neural Network

Table 7

Calculation results of topological structures of different network models.

Model	Number of hidden layers	Number of hidden layer nodes	Average error
BP	1	9	11.66
	2	9-5	17.37
	2	9-7	9.53
GA-BP	1	9	4.06
	2	9-5	3.65
	2	9-7	2.37
PSO-BP	1	9	2.47
	2	9-5	1.38
	2	9-7	2.31