openpose coco coco
{0, "Nose"}, 0 {0, "nose"},
{1, "Neck"}, (5+6)/2 {1, "left_eye"},
{2, "RShoulder"}, 6 {2, "right_eye"},
{3, "RElbow"}, 8 {3, "left_ear"},
{4, "RWrist"}, 10 {4, "right_ear"},
{5, "LShoulder"}, 5 {5, "left_shoulder"},
{6, "LElbow"}, 7 {6, "right_shoulder"},
{7, "LWrist"}, 9 {7, "left_elbow"},
{8, "RHip"}, 12 {8, "right_elbow"},
{9, "RKnee"}, 14 {9, "left_wrist"},
{10, "RAnkle"}, 16 {10, "right_wrist"},
{11, "LHip"}, 11 {11, "left_hip"},
{12, "LKnee"}, 13 {12, "right_hip"},
{13, "LAnkle"}, 15 {13, "left_knee"},
{14, "REye"}, 2 {14, "right_knee"},
{15, "LEye"}, 1 {15, "left_ankle"},
{16, "REar"}, 4 {16, "right_ankle"},
{17, "LEar"}, 3
{18, "Background"},
the openpose "Neck" is the center of coco "RShoulder" and "LShoulder"