docstr: Flatten get_partition_refs. Get a list of partition_refs or shard_refs
docstr_tok: ["Flatten","get_partition_refs",".","Get","a","list","of","partition_refs","or","shard_refs"]
code: def get_refs(self) -> List["ObjectRef"]:
      """
      Flatten get_partition_refs. Get a list of partition_refs or shard_refs
      """
      partition_refs = self.get_partition_refs()
      return [
          ref
          for partition_ref in partition_refs
          for ref in partition_ref
      ]
  
imports: from __future__ import annotations
  from collections import defaultdict
  import ray
  import ray._private.services
  import uuid
  import random
  from bigdl.orca.data import XShards
  from bigdl.orca.ray import OrcaRayContext
  import logging
  from bigdl.dllib.utils.log4Error import invalidInputError
  from numpy import ndarray
  from typing import TYPE_CHECKING, Any, Callable, DefaultDict, Dict, List, Tuple, Union, no_type_check
label_desc: Use image node_id 6 for calling the RayXShards obj's underlying member method code with example usage: obj.get_refs() and returns: unknown