问题描述：
struct std::is_convertible’
struct is_convertible
error: command '/usr/local/cuda/bin/nvcc' failed with exit status 1
The latest gcc version supported with CUDA 9.1 is 6.3.0, it looks like
6.2.1 is the version tested with Fedora 25:
简而言之就是cuda9.0和gcc6.4不兼容，解方法是下载一个gcc5，在cuda/bin下做一个软连接，该方法亦可以解决cuda只支持gcc版本不能高于6的问题！
sudo ln -s /share/share/soft/gcc-5.5.0/bin/g++ /usr/local/cuda/bin/g++
sudo ln -s /share/share/soft/gcc-5.5.0/bin/gcc /usr/local/cuda/bin/gcc
参考：
https://devtalk.nvidia.com/default/topic/1028112/cuda-setup-and-installation/nvcc-bug-related-to-gcc-6-lt-tuple-gt-header-/
https://github.com/facebookresearch/maskrcnn-benchmark/issues/216