Table 1.

The size of the training sets for dataset 1 and dataset 2 before and after data augmentation.

Datasets	Class	Before DA	After DA
Dataset 1	COVID-19	155	465
	Viral pneumonia	1085	3255
	Normal	1085	3255
Dataset 2	COVID-19	200	600
	Viral pneumonia	950	2850
	Normal	950	2850
Dataset 3	COVID-19	800	–
	Viral pneumonia	5000	–
	Normal	5000	–