code: def register_fetch_class(output_type, fetch_cls, fetch_shuffle_cls):
      _OUTPUT_TYPE_TO_FETCH_CLS[output_type] = (
          fetch_cls,
          fetch_shuffle_cls,
      )
  
file_path: mars/mars/core/entity/output_types.py
imports: import functools
  from enum import Enum
  from .fuse import FUSE_CHUNK_TYPE
  from .objects import OBJECT_TYPE, OBJECT_CHUNK_TYPE
label_desc: Use image node_id 2 for calling a global function with example usage: register_fetch_class(output_type, fetch_cls, fetch_shuffle_cls) without return types