code: def is_integer(value: str) -> bool:
      try:
          int(value)
          return True
      except Exception:
          return False
  
imports: import hashlib
  import os
  from dataclasses import dataclass
  from time import time
  from typing import Any, Dict, List, Optional, Tuple, Union
  import numpy
  from torch.utils.data import IterableDataset, get_worker_info
  from lightning.data.streaming import Cache
  from lightning.data.streaming.constants import _DEFAULT_CACHE_DIR, _INDEX_FILENAME, _LIGHTNING_CLOUD_LATEST
  from lightning.data.streaming.item_loader import BaseItemLoader
  from lightning.data.streaming.sampler import ChunkedIndex
  from lightning.data.streaming.serializers import Serializer
  from lightning.data.streaming.shuffle import FullShuffle, NoShuffle, Shuffle
  from lightning.data.utilities.env import Environment, _DistributedEnv, _WorkerEnv
label_desc: Use image node_id 4 for calling a global function with example usage: is_integer(value) and returns: True, False