问题解决来源：

https://stackoverflow.com/questions/48838386/g-not-available-if-using-conda-conda-install-m2w64-toolchain

出现警示：

WARNING (theano.configdefaults): g++ not available, if using conda: `conda install m2w64-toolchain`
C:\ProgramData\Anaconda3\lib\site-packages\theano\configdefaults.py:560: UserWarning: DeprecationWarning: there is no c++ compiler.This is deprecated and with Theano 0.11 a c++ compiler will be mandatory
  warnings.warn("DeprecationWarning: there is no c++ compiler."
WARNING (theano.configdefaults): g++ not detected ! Theano will be unable to execute optimized C-implementations (for both CPU and GPU) and will default to Python implementations. Performance will be severely degraded. To remove this warning, set Theano flags cxx to an empty string.
WARNING (theano.tensor.blas): Using NumPy C-API based implementation for BLAS functions.

解决方法：

1、在anaconda中的prompt中输入：conda install m2w64-toolchain

2、在安装好m2w64-toolchain后，接着输入：conda install libpython

完美解决。