Table 2.

Effect of varying focal loss parameters on the detection performance (in terms of mAP) on GDXray [15] and SIXray [14] dataset. Bold indicates the optimal performance.

GDXray [15]		$\alpha$
		0.25	0.5	0.75
	1	0.9059	0.8742	0.8693
	2	0.9162	0.8916	0.8869
$\gamma$	3	0.9143	0.8882	0.8807
	4	0.9017	0.8834	0.8762
	5	0.9064	0.8763	0.8691
SIXray [14]		$\alpha$
		0.25	0.5	0.75
	1	0.5483	0.5140	0.4926
	2	0.6457	0.6283	0.6182
$\gamma$	3	0.6283	0.6036	0.5874
	4	0.6156	0.5709	0.5370
	5	0.6083	0.5472	0.5198

Scores for the SIXray dataset represent the average of SIXray10, SIXray100, and SIXray1000 subset.