PreconditionNotMetError: The third-party dynamic library (cudnn64_7.dll) that Paddle depends on is not configured correctly. (error code is 126)

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PreconditionNotMetError: The third-party dynamic library (cudnn64_7.dll) that Paddle depends on is not configured correctly. (error code is 126)
Suggestions:

1. Check if the third-party dynamic library (e.g. CUDA, CUDNN) is installed correctly and its version is matched with paddlepaddle you installed.
2. Configure third-party dynamic library environment variables as follows:

• Linux: set LD_LIBRARY_PATH by export LD_LIBRARY_PATH=...
• Windows: set PATH by `set PATH=XXX; (at D:\2.0.0-rc0\paddle\paddle\fluid\platform\dynload\dynamic_loader.cc:225)