code: def _get_to_fetch_tileable(
      self, tileable: TileableType
  ) -> Tuple[TileableType, List[Union[slice, Integral]]]:
      from ...tensor.indexing import TensorIndex
      from ...dataframe.indexing.iloc import (
          DataFrameIlocGetItem,
          SeriesIlocGetItem,
      )
  
      slice_op_types = (
          TensorIndex,
          DataFrameIlocGetItem,
          SeriesIlocGetItem,
      )
  
      if hasattr(tileable, "data"):
          tileable = tileable.data
  
      indexes = None
      while tileable not in self._tileable_to_fetch:
          # if tileable's op is slice, try to check input
          if isinstance(tileable.op, slice_op_types):
              indexes = tileable.op.indexes
              tileable = tileable.inputs[0]
              if not all(
                  isinstance(index, (slice, Integral))
                  for index in indexes
              ):
                  raise ValueError("Only support fetch data slices")
          elif isinstance(tileable.op, Fetch):
              break
          else:
              raise ValueError(
                  f"Cannot fetch unexecuted tileable: {tileable!r}"
              )
  
      if isinstance(tileable.op, Fetch):
          return tileable, indexes
      else:
          return self._tileable_to_fetch[tileable], indexes
  
imports: import asyncio
  import itertools
  import logging
  import json
  import time
  import warnings
  from collections import defaultdict
  from dataclasses import dataclass
  from numbers import Integral
  from urllib.parse import urlparse
  from weakref import WeakKeyDictionary, WeakSet
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import numpy
  from ...None import oscar
  from ...utils import Timer, build_fetch, copy_tileables
  from ...core import ChunkType, TileableType, enter_mode, TileableGraph
  from ...core.operand import Fetch
  from ...lib.aio import alru_cache
  from ...metrics import Metrics
  from ...services.cluster import AbstractClusterAPI, ClusterAPI
  from ...services.lifecycle import AbstractLifecycleAPI, LifecycleAPI
  from ...services.meta import MetaAPI, AbstractMetaAPI
  from ...services.session import AbstractSessionAPI, SessionAPI
  from ...services.mutable import MutableAPI
  from ...services.storage import StorageAPI
  from ...services.task import AbstractTaskAPI, TaskAPI, TaskResult
  from ...services.task.execution.api import Fetcher
  from ...services.web import OscarWebAPI
  from ...session import AbstractAsyncSession, AbstractSession, IsolatedAsyncSession, ExecutionInfo, Progress, Profiling
  from ...typing import ClientType, BandType
  from ...utils import implements, merge_chunks, merged_chunk_as_tileable_type, register_asyncio_task_timeout_detector
label_desc: Use image node_id 2 for calling the _IsolatedSession obj's underlying member method code with example usage: obj._get_to_fetch_tileable(tileable) and returns: tileable,  indexes, self,  indexes