Pruning Multilayered ELM Using Cholesky Factorization and Givens Rotation Transformation

Table 1

Type and quantity of coal collected.

Mineral species	Attribute	Training data	Testing data
Coal	Anthracite	44	27
	Bituminous coal	50	30
	Lignite	36	22
	Coal gangue	66	40
	Total	196	119