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Table 3

Prediction results for relative energy dissipation of the vertical drop

model	Training				Testing
model	R²	RMSE	NRMSE (%)	MAPE (%)	R²	RMSE	NRMSE (%)	MAPE (%)
ANN	0.9938	0.0081	1.92	1.59	0.9805	0.0125	3.10	2.41
SVM	0.9814	0.0136	3.20	3.01	0.9723	0.0139	3.46	3.02
GEP	0.8049	0.0433	10.18	8.41	0.7603	0.0434	10.80	9.44

model	Training				Testing
model	R²	RMSE	NRMSE (%)	MAPE (%)	R²	RMSE	NRMSE (%)	MAPE (%)
ANN	0.9938	0.0081	1.92	1.59	0.9805	0.0125	3.10	2.41
SVM	0.9814	0.0136	3.20	3.01	0.9723	0.0139	3.46	3.02
GEP	0.8049	0.0433	10.18	8.41	0.7603	0.0434	10.80	9.44