Table 9.

Ablation study of our NIA-Network on the COVID-19 testing dataset. The mark $✓$ indicates that our NIA-Network holds the corresponding component. Note that ResNet + GRL corresponds to Domain Adaptive Faster R-CNN model and Faster R-CNN model utilizes ResNet module, so the two ablation experiments could be referred to Table 6. The last row in this table indicates the full NIA-Network.

	ResNet	NIN	IN	GRL	Sensitivity (%)	Specificity (%)	Accuracy (%)
NIA-Network	$✓$	$✓$			76.8	98.5	87.65
	$✓$		$✓$		70.9	98.0	84.45
	$✓$	$✓$	$✓$		75.2	98.8	87.0
	$✓$	$✓$		$✓$	91.0	98.1	94.55
	$✓$		$✓$	$✓$	93.8	95.8	94.8
		$✓$	$✓$	$✓$	63.0	94.4	50.35
	$✓$	$✓$	$✓$	$✓$	94.2	99.5	96.85