Multigrades Classification Model of Magnesite Ore Based on SAE and ELM

Table 4

Confusion matrix structure of the integrated accuracy ELM testing group output.

The expected training set	The predicted testing set
	Top grade	First grade	Second grade	Third grade	Fourth grade	Waste ore
Top grade	32	0	0	0	0	0
First grade	0	36	2	0	0	0
Second grade	0	0	33	0	0	0
Third grade	0	0	1	30	0	0
Fourth grade	0	0	0	0	32	0
Waste ore	0	0	0	0	0	32