pytorch framework yolov5 model

1. Detailed explanation of the official yolov5 model

        1. For the network structure part, please refer to the following articles:

               1) Differences between yolov series:  understand YOLOv5 (including network structure) in one article - Technology Circle

               2) Detailed explanation of yolov5 network structure: https://blog.csdn.net/Augurlee/article/details/108020933

        2. Detailed code explanation, detect.py/train.py/yolov5s.yaml and other codes or configuration files

                1) Getting started: https://blog.csdn.net/qq_38253797/article/details/119043919