Table 5 Quantity of reinforcement and concrete in each project.

From: Construction cost prediction model for agricultural water conservancy engineering based on BIM and neural network

Model

Hyper-parameters

Value

BP

Number of iterations

2000

Learning rate

0.01

Number of hidden layer nodes

11

Minimum error of training objective

0.00001

Learning function

trainlm

RF

Estimator

100

Max depth

5

XGBoost

Estimator

500

Max depth

3

Learning rate

0.01

SSA

Early warning value

0.6

Population size

30

Maximum number of iterations

100

Upper boundary of weight threshold

5

Weight threshold lower boundary

−5

Proportion of searchers

0.7

Proportion of early warning personnel

0.2