Created by: xueeinstein

https://github.com/PaddlePaddle/models/blob/8aa202ade1a142d6476a67a65baf8160ad9e4b70/PaddleCV/human_pose_estimation/utils/utility.py#L341

@qingqing01 @KaiyuYue This postprocessing operation only gets max keypoints prediction from the heatmap. What if there are multiple persons? Is there any way to get multi-person pose?