https://github.com/dluvizon/pose-regression/blob/master/posereg/measures.py
https://programtalk.com/vs2/?source=python/11490/deeppose/Codes/DeepPose%20Original/EvalLSP.py
https://github.com/dluvizon/pose-regression/blob/master/posereg/measures.py
https://programtalk.com/vs2/?source=python/11490/deeppose/Codes/DeepPose%20Original/EvalLSP.py