彻底解决tensorflow:ImportError: Could not find 'cudart64_90.dll'

今天装tensorflow-gpu出现了很多问题

1.pip install tensorflow-gpu下载过慢
解决办法可查看 Python机器学习常用模块

2.安装完tensorflow以后，运行时出现ImportError: Could not find ‘cudart64_90.dll’
解决办法：在https://developer.nvidia.com/cuda-toolkit上下载CUDA 9.0,一定要下载对应的版本，然后安装，
一般默认的位置安装的位置在C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0。
安装完以后，再设置环境变量
CUDA_PATH = C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0
CUDA_PATH_V9_0 = C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0
CUDA_SDK_PATH = C:\ProgramData\NVIDIA Corporation\CUDA Samples\v9.0
CUDA_LIB_PATH = %CUDA_PATH%\lib\x64
CUDA_BIN_PATH = %CUDA_PATH%\bin
CUDA_SDK_BIN_PATH = %CUDA_SDK_PATH%\bin\win64
CUDA_SDK_LIB_PATH = %CUDA_SDK_PATH%\common\lib\x64

3.安装完CUDA 9.0以后，还是出现:ImportError: Could not find ‘cudnn64_7.dll’
解决办法:在https://developer.nvidia.com/cudnn 上注册，然后下载相应版本，解压缩文件，然后将D:\cudnn-9.2-windows10-x64-v7.1\cuda\bin\cudnn64_7.dll 文件拷贝到C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0\bin里面，就大功告成了