Table 2.

Key hyperparameters of Mask R-CNN. Hyperparameters marked with ∗ are used only at test time

Backbone	Anchor	Anchor	RPN	RoI	RPN	RoI	RPN	RoI	RPN	RoI	RoI
	sizes	scales	NMS𝜃	NMS𝜃	batch	batch	output	output∗	IoU𝜃	IoU𝜃	conf. score${}_{𝜃}^{\ast }$
ResNet50	22:5	0.1, 0.25, 0.5,	0.75	0.25	256	256	1000	100	0.75	0.75	0.05
+FPN		1, 1.5, 2