class_docstr: Mock downloading three pre-stratified files.
class_docstr_tok: ["Mock","downloading","three","pre-stratified","files","."]
code: def __init__(self):
      super().__init__(
          training_url=NATIONS_TRAIN_PATH.as_uri(),
          testing_url=NATIONS_TEST_PATH.as_uri(),
          validation_url=NATIONS_VALIDATE_PATH.as_uri(),
      )
  
imports: import pathlib
  import unittest
  from io import BytesIO
  from urllib.request import urlopen
  from pykeen.datasets import Kinships, Nations, dataset_resolver
  from pykeen.datasets.base import PackedZipRemoteDataset, SingleTabbedDataset, TarFileRemoteDataset, TarFileSingleDataset, UnpackedRemoteDataset
  from pykeen.datasets.nations import NATIONS_TEST_PATH, NATIONS_TRAIN_PATH, NATIONS_VALIDATE_PATH
  from tests import cases, constants
label_desc: Use image node_id 1 to create a new MockUnpackedRemoteDataset object from inherited base classes: UnpackedRemoteDataset with example: obj = MockUnpackedRemoteDataset()