在切换cuda版本时

rm -rf /usr/local/cuda#删除之前创建的软链接
sudo ln -s /usr/local/cuda-8.0/ /usr/local/cuda
nvcc --version #查看当前 cuda 版
安装cudnn
sudo cp cuda/include/cudnn.h /usr/local/cuda/include/

sudo cp cuda/lib64/libcudnn* /usr/local/cuda/lib64/

sudo chmod a+r /usr/local/cuda/include/cudnn.h

sudo chmod a+r /usr/local/cuda/lib64/libcudnn*

查看cudnn的版本
cat /usr/local/cuda/include/cudnn.h | grep CUDNN_MAJOR -A 2