libcudnn (R5) not found in library path

环境：Ubuntu 18.04 + Torch7 + cuda10

在运行使用cudnn的lua程序的时候产生错误：

/home/majiabiao/torch/install/bin/luajit: /home/majiabiao/torch/install/share/lua/5.1/trepl/init.lua:: /home/majiabiao/torch/install/share/lua/5.1/trepl/init.lua:: /home/majiabiao/torch/install/share/lua/5.1/cudnn/ffi.lua:: 'libcudnn (R5) not found in library path.

Please install CuDNN from https://developer.nvidia.com/cuDNN

Then make sure files named as libcudnn.so. or libcudnn..dylib are placed in

your library load path (for example /usr/local/lib , or manually add a path to LD_LIBRARY_PATH)

Alternatively, set the path to libcudnn.so. or libcudnn..dylib

to the environment variable CUDNN_PATH and rerun torch.

For example: export CUDNN_PATH="/usr/local/cuda/lib64/libcudnn.so.5"

stack traceback:

    [C]: in function 'error'

    /home/majiabiao/torch/install/share/lua/5.1/trepl/init.lua:: in function 'require'

    test.lua:: in main chunk

    [C]: in function 'dofile'

    ...biao/torch/install/lib/luarocks/rocks/trepl/scm-/bin/th:: in main chunk

    [C]: at 0x555bad5c4570

去我安装的cuda文件夹下查看：/usr/local/cuda-10.1/lib64，发现没有 libcudnn.so.5 or libcudnn.5.dylib而是libcudnn.so.7 libcudnn.so.7.5.0

根据错误信息查看文件/home/majiabiao/torch/install/share/lua/5.1/cudnn/ffi.lua

local libnames = {'libcudnn.so.5', 'libcudnn.5.dylib', 'cudnn64_5.dll'}

    local ok = false

    for i=,#libnames do

        ok = pcall(function () cudnn.C = ffi.load(libnames[i]) end)

        if ok then break; end

    end

    if not ok then

将'libcudnn.so.5', 'libcudnn.5.dylib'修改为'libcudnn.so.7', 'libcudnn.7.dylib'结果变为以下错误

/home/majiabiao/torch/install/bin/luajit: /home/majiabiao/torch/install/share/lua/5.1/trepl/init.lua:: /home/majiabiao/torch/install/share/lua/5.1/trepl/init.lua:: /home/majiabiao/torch/install/share/lua/5.1/cudnn/ffi.lua:: These bindings are for CUDNN .x ( <= cudnn.version > ) , while the loaded CuDNN is version:

Are you using an older or newer version of CuDNN?

stack traceback:

    [C]: in function 'error'

    /home/majiabiao/torch/install/share/lua/5.1/trepl/init.lua:: in function 'require'

    test.lua:: in main chunk

    [C]: in function 'dofile'

    ...biao/torch/install/lib/luarocks/rocks/trepl/scm-/bin/th:: in main chunk

    [C]: at 0x561e50b7e570

那么之前那个找不到libcudnn.so.5 or libcudnn.5.dylib的错误的原因是不兼容某些版本的cudnn，只兼容5005到6000之间的版本

那么如果使用的是不兼容版本的cudnn，那么就在现有cuda的基础上更改cudnn的版本，只需要替换一些文件

去nvidia官网下载将要使用的版本的cudnn，解压出来的文件夹cuda中有两个文件夹include和lib64

#删除原有版本的cudnn（注意你的文件夹是否是这个路径）

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

sudo rm -rf /usr/local/cuda/lib64/libcudnn*

#将下载好的新的版本的cudnn文件放到刚才删除的文件所在位置：

sudo cp include/cudnn.h /usr/local/cuda/include/

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

#cd到/usr/local/cuda/lib64/文件夹下，建立软链接（注意版本号换成你自己的）

sudo chmod +r libcudnn.so.5.0.

sudo ln -sf libcudnn.so.5.0. libcudnn.so.

sudo ln -sf libcudnn.so. libcudnn.so

sudo ldconfig

之后就可以了

巴特西

libcudnn (R5) not found in library path

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