def METHOD_NAME(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