mocking.mock_data broken by https://github.com/tensorflow/datasets/commit/e8d8966e888667091875fd885ab0803a6dc5a383

[ruomingp]

/!\ PLEASE INCLUDE THE FULL STACKTRACE AND CODE SNIPPET

Short description https://github.com/tensorflow/datasets/commit/e8d8966e888667091875fd885ab0803a6dc5a383 broken mock_data().

Environment information

• Operating System: Linux

• Python version: 3.7.7

• tensorflow-datasets/tfds-nightly version: 4.5.2.dev202203220044

• Does the issue still exists with the last tfds-nightly package (pip install --upgrade tfds-nightly) ?

Reproduction instructions

  with mock_data(num_examples=40):
    builder = tfds.builder("imagenet2012", "...")
    ... 

Link to logs

input_tfds.py:74: in _build_dataset
    builder = tfds.builder(cfg.dataset_name, data_dir=cfg.data_dir)
/miniconda/envs/py377/lib/python3.7/site-packages/tensorflow_datasets/core/load.py:149: in builder
    community.community_register.has_namespace(name.namespace)):
/miniconda/envs/py377/lib/python3.7/site-packages/tensorflow_datasets/core/community/registry.py:124: in has_namespace
    return namespace in self.registers_per_namespace
/miniconda/envs/py377/lib/python3.7/site-packages/tensorflow_datasets/core/community/registry.py:121: in registers_per_namespace
    return self.namespace_config.registers_per_namespace()
/miniconda/envs/py377/lib/python3.7/site-packages/tensorflow_datasets/core/community/registry.py:93: in registers_per_namespace
    config = toml.loads(self.config_path.read_text())
/miniconda/envs/py377/lib/python3.7/site-packages/etils/epath/abstract_path.py:141: in read_text
    return f.read()
/miniconda/envs/py377/lib/python3.7/site-packages/tensorflow/python/lib/io/file_io.py:114: in read
    self._preread_check()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
 self = <tensorflow.python.platform.gfile.GFile object at 0x7f4e18542450>
     def _preread_check(self):
      if not self._read_buf:
        if not self._read_check_passed:
          raise errors.PermissionDeniedError(None, None,
                                             "File isn't open for reading")
        self._read_buf = _pywrap_file_io.BufferedInputStream(
>           compat.path_to_str(self.__name), 1024 * 512)
E       tensorflow.python.framework.errors_impl.NotFoundError: /miniconda/envs/py377/lib/python3.7/site-packages/tensorflow_datasets/community-datasets.toml; No such file or directory
 /miniconda/envs/py377/lib/python3.7/site-packages/tensorflow/python/lib/io/file_io.py:77: NotFoundError

Expected behavior tfds does not try to read community-datasets.toml.

Additional context Add any other context about the problem here.

[texasfight]

Similar issues with load and list_builders methods running on colab from the tfds-nightly package. Output for tfds.list_builders() is below:

---

[<ipython-input-5-89a978348cb8>](https://localhost:8080/#) in <module>()
----> 1 tfds.list_builders()

6 frames

[/usr/local/lib/python3.7/dist-packages/tensorflow_datasets/core/load.py](https://localhost:8080/#) in list_builders(with_community_datasets)
     64   if with_community_datasets:
     65     if visibility.DatasetType.COMMUNITY_PUBLIC.is_available():
---> 66       datasets += community.community_register.list_builders()
     67   return datasets
     68 

[/usr/local/lib/python3.7/dist-packages/tensorflow_datasets/core/community/registry.py](https://localhost:8080/#) in list_builders(self)
    129   def list_builders(self) -> List[str]:
    130     builders = []
--> 131     for registers in self.registers_per_namespace.values():
    132       for register in registers:
    133         builders.extend(register.list_builders())

[/usr/local/lib/python3.7/dist-packages/tensorflow_datasets/core/community/registry.py](https://localhost:8080/#) in registers_per_namespace(self)
    119   def registers_per_namespace(
    120       self) -> Mapping[str, List[register_base.BaseRegister]]:
--> 121     return self.namespace_config.registers_per_namespace()
    122 
    123   def has_namespace(self, namespace: str) -> bool:

[/usr/local/lib/python3.7/dist-packages/tensorflow_datasets/core/community/registry.py](https://localhost:8080/#) in registers_per_namespace(self)
     91       RuntimeError: when the config contains errors.
     92     """
---> 93     config = toml.loads(self.config_path.read_text())
     94     registers_per_namespace = {}
     95     for namespace, path_or_paths in config['Namespaces'].items():

[/usr/local/lib/python3.7/dist-packages/etils/epath/abstract_path.py](https://localhost:8080/#) in read_text(self, encoding)
    139     """Reads contents of self as bytes."""
    140     with self.open('r', encoding=encoding) as f:
--> 141       return f.read()
    142 
    143   # ====== Write methods ======

[/usr/local/lib/python3.7/dist-packages/tensorflow/python/lib/io/file_io.py](https://localhost:8080/#) in read(self, n)
    112       string if in string (regular) mode.
    113     """
--> 114     self._preread_check()
    115     if n == -1:
    116       length = self.size() - self.tell()

[/usr/local/lib/python3.7/dist-packages/tensorflow/python/lib/io/file_io.py](https://localhost:8080/#) in _preread_check(self)
     75                                            "File isn't open for reading")
     76       self._read_buf = _pywrap_file_io.BufferedInputStream(
---> 77           compat.path_to_str(self.__name), 1024 * 512)
     78 
     79   def _prewrite_check(self):

NotFoundError: /usr/local/lib/python3.7/dist-packages/tensorflow_datasets/community-datasets.toml; No such file or directory```

[tomvdw]

Hi! Thanks for reporting this. This should now be fixed (that file wasn't included in the package, so we added it). Could you retry? Kind regards, Tom