Table 3.

Key hyperparameters of COVID-CT-Mask-Net

Backbone	Anchor	Anchor	RPN	RoI	RPN	RoI	RoI	Classifier
	sizes	scales	NMS𝜃	NMS𝜃	output	batch	class. score𝜃	Module S
ResNet50	22:5	0.1, 0.25, 0.5,	0.75	0.75	1000	256	-0.01	2.26M
+FPN		1, 1.5, 2