Prediction of Mechanical Properties of Aluminium Alloy Strip Using the Extreme Learning Machine Model Optimized by the Gray Wolf Algorithm

Table 5

Optimal penalty factor vs. original factor.

i	j	Test set MAPE (%)			Train set MAPE (%)			Variance
		Tensile strength	Yield strength	Elongation	Tensile strength	Yield strength	Elongation	Test set	Train set
1	1	4.04811	10.09929	6.94424	2.57422	6.30288	8.76849	6.107	6.483
20	80	3.17806	6.50873	6.41047	2.80229	6.35357	7.42699	2.395	3.906