code: def default_data_name(self) -> str:
      return "keypoints"
  
imports: from __future__ import division
  import math
  import typing
  import warnings
  from typing import Any, Dict, List, Optional, Sequence, Tuple
  from .utils import DataProcessor, Params
label_desc: Use image node_id 2 for calling the KeypointsProcessor obj's underlying member method code with example usage: obj.default_data_name() and returns: str