code: def _merge_keypoint_list(keypoints: List[Tensor]) -> Tensor:
      raise NotImplementedError
  
imports: from typing import List, Optional, Tuple, Union, cast
  import torch
  from torch import Size
  from kornia.core import Tensor
  from kornia.geometry import transform_points
label_desc: Use image node_id 1 for calling a global function with example usage: _merge_keypoint_list(keypoints) without return types