docstr: Output (List): List of keypoint results for Skeletonbased Recognition task, where 
                 the format of each element is [tracker_id, KeyPointSequence of tracker_id]
docstr_tok: ["Output","(","List",")",":","List","of","keypoint","results","for","Skeletonbased","Recognition","task",",","where","the","format","of","each","element","is","[","tracker_id",",","KeyPointSequence","of","tracker_id","]"]
code: 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
  
file_path: PaddleDetection/deploy/pipeline/pphuman/action_utils.py
label_desc: Use image node_id 4 for calling the KeyPointBuff obj's underlying member method code with example usage: obj.get_collected_keypoint() and returns: output