udnn安装注意点：
cudnn的安装其实很简单，关键点是一定要安装cuda对应的cudnn包，本机中安装的cuda7.5所以对应的cudnn为v5.1这很重要，我就是安装错了版本，导致后面caffe的编译总是出错。
cudnn安装步骤：
1、从官网上下载cudnn的安装包。
2、将安装包解压,将此安装包放在home路径下即可，并在当前路径下进行解压,解压后的文件夹名为cuda。
3、在终端上编辑如下代码：

$ cd cuda/include 
$ sudo cp *.h /usr/local/cuda/include/ (注意这里是你自己的cuda的安装地址，复制*.h文件)

4、关闭终端并重新打开（也可以返回最开始的目录）

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

5、终端运行：

$ sudo chmod a+r /usr/local/cuda/include/cudnn.h /usr/local/cuda/lib64/libcudnn*

运行faster rcnn代码提示：

Loaded runtime CuDNN library: 7.1.3 but source was compiled with: 7.4.1. CuDNN library major and minor version needs to match or have higher minor version in case of CuDNN 7.0 or later version. If using a binary install, upgrade your CuDNN library. If building from sources, make sure the library loaded at runtime is compatible with the version specified during compile configuration.
遂将cudnn卸载：

sudo rm -rf /usr/local/cuda/include/cudnn.h
sudo rm -rf /usr/local/cuda/lib64/libcudnn*

 将cudnn卸载后，重新安装cudnn

转自：https://blog.csdn.net/u010480194/article/details/54287727