lightweight的关键点排序

这是排序，neck是作为最后一个节点。

reorder_map = [1, 7, 9, 11, 6, 8, 10, 13, 15, 17, 12, 14, 16, 3, 2, 5, 4]
converted_keypoints = list(keypoints[i - 1] for i in reorder_map)
converted_keypoints.insert(1, [(keypoints[5][0] + keypoints[6][0]) / 2,
(keypoints[5][1] + keypoints[6][1]) / 2, 0]) # Add neck as a mean of shoulders