A Data-Driven Method for Predicting the Cutterhead Torque of EPB Shield Machine

Table 3

Comparison of scores with different models.

Line	Geology	Model	Statistic
			Training data	Testing data	RMSE	Time (s)
Zhengzhou, Line 4, Rings 550–556	Fine sand, penetration value 23.1, surrounding rock grade VI	LM	0.81	0.78	548.3	0.88
		SVR	0.97	0.75	544.1	2.24
		RFM	0.99	0.81	497.8	1.78
Luoyang, Line 1, Rings 104–106	Silty clay, penetration value 14.3, surrounding rock grade V	LM	0.95	0.94	122.9	0.02
		SVR	0.92	0.88	138.3	1.33
		RFM	0.99	0.96	121.9	0.42
Dalian, Line 5, Rings 47-48	Moderately weathered limestone, surrounding rock grade V	LM	0.78	0.77	259.3	0.03
		SVR	0.94	0.81	272.7	2.77
		RFM	0.99	0.79	245.2	1.36