Gradient Boosted Trees Predictive Models for Surface Roughness in High-Speed Milling in the Steel and Aluminum Metalworking Industry

Table 3

Discretization of variables of the Exp-1 model.

State	F	n	ap	Ra
	[lower, upper)	[lower, upper)		[lower, upper)
0			0.2	Smooth =
1			0.4	Fine =
2			0.6	Semi-Fine =
3			1	Medium =