code: def test_get_tfds_id_prefixes_multiple_directories(self):
      file_instructions = [
          shard_utils.FileInstruction("/a/b/f1", 0, -1, 1),
          shard_utils.FileInstruction("/a/b/f2", 0, -1, 1),
          shard_utils.FileInstruction("/x/y/z/f1", 0, -1, 1),
          shard_utils.FileInstruction("/a/c/f1", 0, -1, 1),
          shard_utils.FileInstruction("/a/b/c/d/e/f1", 0, -1, 1),
      ]
      actual = reader_lib._get_tfds_id_prefixes(file_instructions)
      expected = {
          "/a/b/c/d/e/f1": "e/f1",
          "/a/b/f1": "b/f1",
          "/a/b/f2": "b/f2",
          "/a/c/f1": "c/f1",
          "/x/y/z/f1": "z/f1",
      }
      self.assertEqual(actual, expected)
  
imports: import functools
  import itertools
  import os
  from unittest import mock
  import tensorflow
  import tensorflow_datasets
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import example_parser
  from tensorflow_datasets.core import naming
  from tensorflow_datasets.core import reader
  from tensorflow_datasets.core import splits
  from tensorflow_datasets.core import writer
  from tensorflow_datasets.core.utils import read_config
  from tensorflow_datasets.core.utils import shard_utils
label_desc: Use image node_id 2 for calling the AddTfdsIdTest obj's underlying member method code with example usage: obj.test_get_tfds_id_prefixes_multiple_directories() without return types