code: def _register_object(index, cls):
      """register object class"""
      # if issubclass(cls, NDArrayBase):
      #     _register_ndarray(index, cls)
      #     return
      OBJECT_TYPE[index] = cls
  
file_path: mxnet/python/mxnet/_ffi/_ctypes/object.py
imports: import ctypes
  from ...base import _LIB, check_call
  from .types import RETURN_SWITCH, TypeCode
label_desc: Use image node_id 2 for calling a global function with example usage: _register_object(index, cls) without return types