code: def _hkey_to_bytes(hkey):
      """Converts 128 bits integer hkey to binary representation."""
      max_int64 = 0xFFFFFFFFFFFFFFFF
      return struct.pack(
          "=QQ", (hkey >> 64) & max_int64, hkey & max_int64
      )
  
imports: import math
  import os
  import struct
  from typing import Iterator, List, Optional
  import uuid
  from absl import logging
  import six
  from tensorflow_datasets.core import hashing
  from tensorflow_datasets.core.utils import file_utils
  from tensorflow_datasets.core.utils import type_utils
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
label_desc: Use image node_id 1 for calling a global function with example usage: _hkey_to_bytes(hkey) and returns: struct