YOLOV5 study notes (3) - detailed explanation of network module

1 The role of each module

1.1 Focus: Reduce the amount of computation

1.2 CSPNet Cross-Stage Local Network

1.3 SPP Spatial Pyramid Pooling

Maximum pooling generally leads to the reduction of the feature map, which needs to be filled to make the feature map the same size, and finally stitched.can increase the receptive field.

1.4 PANet

When merging at different scales, the maximum and minimum are more difficult to fuse, so there is an up-sampling and a down-sampling, which is better for fusion.

2 loss function