参考了以下博客，以后再做整理。
- https://blog.csdn.net/rockingdingo/article/details/75452711
- https://blog.csdn.net/fireflychh/article/details/78321422
- http://mathmach.com/2017/10/09/tensorflow_c++_api_prediction_first/
- http://mathmach.com/2017/10/11/tensorflow_c++_api_prediction_second/
- https://zhuanlan.zhihu.com/p/30985013
- https://cloud.tencent.com/developer/article/1006107