Coupling a Bat Algorithm with XGBoost to Estimate Reference Evapotranspiration in the Arid and Semiarid Regions of China

Table 2

Input combinations of different meteorological parameters used in this study.

Combinations	Models			Input combinations
	GPR	MARS	BAXGB
1	GPR1	MARS1	BAXGB1
2	GPR2	MARS2	BAXGB2
3	GPR3	MARS3	BAXGB3
4	GPR4	MARS4	BAXGB4
5	GPR5	MARS5	BAXGB5
6	GPR6	MARS6	BAXGB6