code: def _make_stream_dir(self, stream_name, worker=0):
      stream_dir = os.path.join(self._path, "streams", stream_name)
      os.makedirs(stream_dir)
      pathlib.Path(os.path.join(stream_dir, "owner_worker")).write_text(
          f"{worker}"
      )
  
imports: import collections
  import os
  import pathlib
  import shutil
  import tempfile
  import time
  from absl.testing import parameterized
  from tensorflow.python.data.experimental.kernel_tests.service import test_base
  from tensorflow.python.data.experimental.ops import distributed_save_op
  from tensorflow.python.data.experimental.service import _pywrap_snapshot_utils
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import test_mode
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling the SnapshotFtTest obj's underlying member method code with example usage: obj._make_stream_dir(stream_name, worker) without return types