Table 2.

Classification errors achieved by different architectures on the validation set.

Network	Five-layer	Six-layer	Seven-layer	Eight-layer
Optimal error	0.0637	0.0594	0.0578	0.0587
Number of iterations	7000	8000	8000	9000
Mean error	0.0675	0.0649	0.0634	0.0649
Standard deviation	0.0032	0.0045	0.0037	0.0051