64位windows10下安装tensorflow出现ImportError: DLL load failed: The specified module could not be found

在windows10下尝试安装高版本的tensorflow，需要GPU的支持，安装了CUDA9.0，下载了cudnn7.0.5以后，运行import tensorflow报错，报错信息如下，大概一丝就是DLL文件没有找到

Traceback (most recent call last):

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in

from tensorflow.python.pywrap_tensorflow_internal import *

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in

_pywrap_tensorflow_internal = swig_import_helper()

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 24, in swig_import_helper

_mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\imp.py", line 243, in load_module

return load_dynamic(name, filename, file)

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\imp.py", line 343, in load_dynamic

return _load(spec)

ImportError: DLL load failed: The specified module could not be found.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "", line 1, in

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow_init_.py", line 22, in

from tensorflow.python import pywrap_tensorflow # pylint: disable=unused-import

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python_init_.py", line 49, in

from tensorflow.python import pywrap_tensorflow

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 74, in

raise ImportError(msg)

ImportError: Traceback (most recent call last):

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in

from tensorflow.python.pywrap_tensorflow_internal import *

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in

_pywrap_tensorflow_internal = swig_import_helper()

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 24, in swig_import_helper

_mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\imp.py", line 243, in load_module

return load_dynamic(name, filename, file)

File "C:\Users\Darshan\AppData\Local\Programs\Python\Python36\lib\imp.py", line 343, in load_dynamic

return _load(spec)

ImportError: DLL load failed: The specified module could not be found.

Failed to load the native TensorFlow runtime.

在Tensorflow的github中的issue里有大量讨论，https://github.com/tensorflow/tensorflow/issues/22794但是在我看来没有什么用，我从头到尾看了一遍，各种的尝试都是摸瞎，而且方法很少，报问题的很多。

看到报错的问题，就是DLL文件没有找到，但是查看报错的文件，只是tensorflow封装的pyd文件，难以找到到底是哪个DLL文件的缺失，但是从讨论看普遍是CUDA或者是cudnn文件的适配问题。猜想还是cudnn文件里的DLL文件没有load进来的问题，于是仔细查看cudnn的安装文档：https://docs.nvidia.com/deeplearning/sdk/cudnn-install/index.html，找到了一个关键的操作:
Copy the following files into the CUDA Toolkit directory.
Copy \cuda\bin\cudnn64_7.dll to C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0\bin.
Copy \cuda\ include\cudnn.h to C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0\include.
Copy \cuda\lib\x64\cudnn.lib to C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0\lib\x64.

在Tensorflow的官网给出的安装cudnn的操作中，只是将cudnn的文件解压到如C:\tools\cuda，并不需要把cudnn的文件拷贝到CUDA的安装目录中，去检查CUDA的这几个文件夹，发现确实在文件夹中没有指定文件，拷贝进去后，成功的运行了Tensorflow没有再报错找不到DLL。

版本信息：

Nvidiai显卡：GTX 1050

驱动版本：419.17

TensorFlow版本：1.12

CUDA版本：9.0

CUDNN版本：7.0.5

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