# add git submodule
git submodule add https://github.com/FedML-AI/MobileNN.git MobileNN
# git update submodule
git submodule update --init --recursive
# git submodule update
git submodule update --remote --merge
for more git submodule related commands, please refer to https://devconnected.com/how-to-add-and-update-git-submodules/