Neck

SPP

SPP: Spatial Pyramid Pooling

[maxpool]
stride=1
size=5

[route]
layers=-2

[maxpool]
stride=1
size=9

[route]
layers=-4

[maxpool]
stride=1
size=13

[route]
layers=-1,-3,-5,-6

modified PAN

PAN: Path Aggregation Network

Reference

• https://github.com/AlexeyAB/darknet/wiki/CFG-Parameters-in-the-different-layers
• YOLOv4: Optimal Speed and Accuracy of Object Detection