jayang的faster-rcnn在windows上运行遇到了很多的麻烦，现在换了一种faster-rcnn
https://github.com/dBeker/Faster-RCNN-TensorFlow-Python3
各种预训练模型的下载地址：https://github.com/tensorflow/models/tree/master/research/slim#pre-trained-models
http://download.tensorflow.org/models/resnet_v2_101_2017_04_14.tar.gz