在安装好cuda 及cudnn之后，安装python3.5.用pip install tensorflow-gpu 安装gpu版的TensorFlow，但是不管怎么操作，都存在下面的问题。在解决问题时，想到：
1）可能是cuda的问题，因为用pip install tensorflow 安装cpu版是没有问题。但是反复验证cuda安装没有问题，环境变量路径设置也没有问题。所以这个原因被排除。
2）可能是python安装的问题，尝试之后依旧不能解决问题。
3)tensorflow-gpu版本的问题，在卸载tensorflow-gpu时发现，卸载的版本为tensorflow-gpu-1.12.0.所以我安装时，用了 pip install tensorflow-gpu==1.0。这时候问题得到完美解决。
Traceback (most recent call last):
File "D:\Program Files\Python35\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in
from tensorflow.python.pywrap_tensorflow_internal import *
File "D:\Program Files\Python35\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in
_pywrap_tensorflow_internal = swig_import_helper()
File "D:\Program Files\Python35\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 "D:\Program Files\Python35\lib\imp.py", line 243, in load_module
return load_dynamic(name, filename, file)
File "D:\Program Files\Python35\lib\imp.py", line 343, in load_dynamic
return _load(spec)
ImportError: DLL load failed: 找不到指定的模块。
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "
File "D:\Program Files\Python35\lib\site-packages\tensorflow\__init__.py", line 24, in
from tensorflow.python import pywrap_tensorflow # pylint: disable=unused-import
File "D:\Program Files\Python35\lib\site-packages\tensorflow\python\__init__.py", line 49, in
from tensorflow.python import pywrap_tensorflow
File "D:\Program Files\Python35\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 74, in
raise ImportError(msg)
ImportError: Traceback (most recent call last):
File "D:\Program Files\Python35\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in
from tensorflow.python.pywrap_tensorflow_internal import *
File "D:\Program Files\Python35\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in
_pywrap_tensorflow_internal = swig_import_helper()
File "D:\Program Files\Python35\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 "D:\Program Files\Python35\lib\imp.py", line 243, in load_module
return load_dynamic(name, filename, file)
File "D:\Program Files\Python35\lib\imp.py", line 343, in load_dynamic
return _load(spec)
ImportError: DLL load failed: 找不到指定的模块。
Failed to load the native TensorFlow runtime.
See https://www.tensorflow.org/install/errors
for some common reasons and solutions. Include the entire stack trace
above this error message when asking for help