Learning Feature Fusion in Deep Learning-Based Object Detector

Table 1

Symbols used in YOLOv3 loss function.

Symbol	Definition
	Number of grid cells in an image
	Number of anchor boxes
	Confidence score of bounding box in grid cell i
	Conditional probability of class c in grid cell i
, , ,	Location and size of a bounding box
	1, if an object appears in grid cell i; 0, otherwise
	1, if an object is present in grid cell and the “responsible” bounding box; 0, otherwise
	1, if no object is present in grid cell and the “responsible” bounding box; 0, otherwise
	1, if predicted label matches the ground truth label; 0, otherwise
	Constant (default: 5.0)
	Constant (default: 0.5)