TABLE I.

The statistics of the prediction accuracy, number of model parameters and training set size of the MLHMs with/without PCA.

Dataset	Model	Number of Model Parameters	Number of Training Data	MAE Mean	MAE Median	MAE STD
HM	PCA-MLHM	42,721	1,490	0.018	0.018	0.001
HM	MLHM [2]	167,024	1,490	0.013	0.013	0.001
HM	Restricted MLHM	88,074	1,490	0.020	0.021	0.001
CF	PCA-MLHM	42,721	210	0.013	0.013	0.001
CF*	MLHM [2]	167,024	2,247*	0.013	0.012	0.002
CF	Restricted MLHM	88,074	210	0.017	0.017	0.003

^*HM was included to augment the training data [2]