code: def get_chunk_refs(df):
      fetched_infos: Dict[str, List] = df.fetch_infos(["object_refs"])
      object_refs = reduce(
          operator.concat, fetched_infos["object_refs"]
      )
      return object_refs
  
imports: import operator
  from functools import reduce
  from ....utils import lazy_import
  from .mldataset import _rechunk_if_needed
  from typing import Dict, List
label_desc: Use image node_id 2 for calling a global function with example usage: get_chunk_refs(df) and returns: object_refs