Imagga
参考：
Imagga – Image & Face Recognition API [Official]
kohaku
参考：
nicoNaN/kohaku: An automated image tagging program written in Ruby using the Imagga API – GitHub
TinyYOLOv2Barracuda
参考：
keijiro/TinyYOLOv2Barracuda: Tiny YOLOv2 on Unity Barracuda – GitHub