def get_collected_keypoint(self):
        """
            Output (List): List of keypoint results for Skeletonbased Recognition task, where 
                           the format of each element is [tracker_id, KeyPointSequence of tracker_id]
        """
        output = []
        for tracker_id in self.id_to_pop:
            output.append([tracker_id, self.keypoint_saver[tracker_id]])
            del (self.keypoint_saver[tracker_id])
        self.flag_to_pop = False
        self.id_to_pop.clear()
        return output

            Output (List): List of keypoint results for Skeletonbased Recognition task, where 
                           the format of each element is [tracker_id, KeyPointSequence of tracker_id]
        
deploy/pipeline/pphuman/action_utils.py