Windows上安装TensorFlow-GPU遇到的神奇问题

今天帮客户在Windows上部署TensorFlow-GPU的环境，他们使用的M4000M显卡，理论上是支持的。

可是客户一开始安装的是cuda9.0+cudnn7.0的版本，一直提示：

File "C:\Anaconda3\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 18, in swig_import_helper
    return importlib.import_module(mname)
  File "C:\Anaconda3\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 666, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 577, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 906, in create_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
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 "C:\Anaconda3\lib\site-packages\tensorflow\python\__init__.py", line 66, in <module>
    from tensorflow.python import pywrap_tensorflow
  File "C:\Anaconda3\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 21, in <module>
    _pywrap_tensorflow = swig_import_helper()
  File "C:\Anaconda3\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 20, in swig_import_helper
    return importlib.import_module('_pywrap_tensorflow')
  File "C:\Anaconda3\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ImportError: No module named '_pywrap_tensorflow'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Anaconda3\lib\site-packages\tensorflow\__init__.py", line 24, in <module>
    from tensorflow.python import *
  File "C:\Anaconda3\lib\site-packages\tensorflow\python\__init__.py", line 72, in <module>
    raise ImportError(msg)
ImportError: Traceback (most recent call last):
  File "C:\Anaconda3\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 18, in swig_import_helper
    return importlib.import_module(mname)
  File "C:\Anaconda3\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 666, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 577, in module_from_spec
  File "<frozen importlib._bootstrap_external>", line 906, in create_module
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
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 "C:\Anaconda3\lib\site-packages\tensorflow\python\__init__.py", line 66, in <module>
    from tensorflow.python import pywrap_tensorflow
  File "C:\Anaconda3\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 21, in <module>
    _pywrap_tensorflow = swig_import_helper()
  File "C:\Anaconda3\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 20, in swig_import_helper
    return importlib.import_module('_pywrap_tensorflow')
  File "C:\Anaconda3\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ImportError: No module named '_pywrap_tensorflow'

Failed to load the native TensorFlow runtime. 

于是我选择重装了cuda8.0+cudnn5.1的经典组合，发现还是提示上面的错误。

百度和google了半天，都是说什么.NET 2015（msvcp140.dll）没有安装，我装了还是不行。

最后发现，原来TensorFlow 1.3需要 cuda8.0+cudnn6，更换了cudnn到6.0的版本就OK了。