Table 5.

Training and validation time complexity comparison between spatial-frequency- sequential features and spatial-frequency features with respect to “Dataset 2a Subject 7” and “Dataset 2b Subject 8”

Datasets and subjects		Spatial-frequency-sequential relationships		Spatial-frequency features
		LSTM-RNN	GRU-RNN	CNN	SVM-linear
Training time	“Dataset 2a S7”	272.26	214.34	478.08	8.19
complexity (/s)	“Dataset 2b S8”	169.80	148.11	342.00	22.83
Validation time	“Dataset 2a S7”	1.89	1.49	3.32	2.01
complexity (/s)	“Dataset 2b S8”	3.40	2.96	6.84	4.17