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如何需要升级yolov5 use分支到更新的提交：直接使用git checkout 526fcb2194 这样即可，其实这里有个问题是，没法在用pull update之类来更新，因为这是个游离分支，直接checkout到号码上去，反正总的git会记录
如何需要从库里更新：使用git submoudle update 更新就行