Add a function to easily override a TFDS data dir in an instantiated …

…source

PiperOrigin-RevId: 670881768

seqio/dataset_providers.py

@@ -538,7 +538,7 @@ def __init__(
   @property
   def splits(self):
     """Overrides since we can't call `info.splits` until after init."""
-    return self._splits or self._tfds_dataset.info.splits
+    return self._splits or self.tfds_dataset.info.splits
 
   @property
   def tfds_dataset(self) -> utils.LazyTfdsLoader:

seqio/utils.py

@@ -94,6 +94,15 @@ def _validate_tfds_name(name: str) -> None:
     raise ValueError(f"TFDS name must contain a version number, got: {name}")
 
 
+def _get_data_dir_override(tfds_name: Optional[str]) -> Optional[str]:
+  """Returns the data dir in case it is overridden."""
+  if (
+      _TFDS_DATA_DIR_OVERRIDE
+  ):
+    return _TFDS_DATA_DIR_OVERRIDE
+  return None
+
+
 @dataclasses.dataclass(frozen=True)
 class TfdsSplit:
   """Points to a specific TFDS split.
@@ -148,6 +157,7 @@ def __init__(
     _validate_tfds_name(name)
     self._name = name
     self._data_dir = data_dir
+    self._data_dir_override = None
     self._split_map = split_map
     self._decoders = decoders
     self._builder_kwargs = builder_kwargs
@@ -238,19 +248,22 @@ def data_dir(self) -> Optional[str]:
       )
       return None
 
+    if self._data_dir_override is None:
+      if data_dir_override := _get_data_dir_override(tfds_name=self.name):
+        self._data_dir_override = data_dir_override
 
-    if (
-        _TFDS_DATA_DIR_OVERRIDE
-    ):
-      if self._data_dir:
-        logging.warning(
-            "Overriding TFDS data directory '%s' with '%s' for dataset '%s'.",
-            self._data_dir,
-            _TFDS_DATA_DIR_OVERRIDE,
-            self.name,
-        )
-      return _TFDS_DATA_DIR_OVERRIDE
-    return self._data_dir
+    if self._data_dir_override and self._data_dir:
+      logging.warning(
+          "Overriding TFDS data directory '%s' with '%s' for dataset '%s'.",
+          self._data_dir,
+          self._data_dir_override,
+          self.name,
+      )
+
+    return self._data_dir_override or self._data_dir
+
+  def override_data_dir(self, data_dir: str) -> None:
+    self._data_dir_override = data_dir
 
   @property
   def read_config(self):

seqio/utils_test.py

@@ -285,6 +285,41 @@ def test_read_config_override(self, mock_tfds_load):
     # reset to default global override
     utils.set_tfds_read_config_override(None)
 
+  @mock.patch("tensorflow_datasets.builder")
+  def test_override_data_dir(self, mock_tfds_builder):
+    mock_builder1 = mock.create_autospec(tfds.core.DatasetBuilder)
+    mock_builder2 = mock.create_autospec(tfds.core.DatasetBuilder)
+    mock_builder3 = mock.create_autospec(tfds.core.DatasetBuilder)
+    mock_tfds_builder.side_effect = [
+        mock_builder1,
+        mock_builder2,
+        mock_builder3,
+    ]
+
+    orig_data_dir = "/data"
+    override1 = "/override1"
+    override2 = "/override2"
+
+    utils.set_tfds_data_dir_override(override1)
+
+    # Should use `override1` that was set globally.
+    loader = utils.LazyTfdsLoader(name="a/b:1.0.0", data_dir=orig_data_dir)
+    self.assertEqual(override1, loader.data_dir)
+    self.assertEqual(loader.builder, mock_builder1)
+
+    loader.override_data_dir(override2)
+    self.assertEqual(override2, loader.data_dir)
+    self.assertEqual(loader.builder, mock_builder2)
+
+    # Set back to original data dir and check whether the cache works.
+    loader.override_data_dir(orig_data_dir)
+    self.assertEqual(orig_data_dir, loader.data_dir)
+    self.assertEqual(loader.builder, mock_builder3)
+    self.assertEqual(mock_tfds_builder.call_count, 3)
+
+    # Unset it to not influence other tests.
+    utils.set_tfds_data_dir_override(None)
+
 
 
 class TransformUtilsTest(parameterized.TestCase):
@@ -375,7 +410,6 @@ def fn(ex, seed):
         mapped_ds = fn(ds)  # pylint: disable=no-value-for-parameter
       results = [7, 5, 6, 6, 7, 11, 12, 16, 15, 15]
       expected_ds = [{"field": results[i]} for i in range(10)]
-      print("gaurav", list(mapped_ds.as_numpy_iterator()))
       self.assertListEqual(list(mapped_ds.as_numpy_iterator()), expected_ds)
 
   def test_random_map_fn_with_kwargs(self):
@@ -432,7 +466,6 @@ def fn(ex, seeds, val, sequence_length):
         mapped_ds = map_fn(ds, sequence_length={"field": -1})  # pylint: disable=no-value-for-parameter
       results = [13, 15, 16, 13, 9, 16, 15, 26, 18, 16]
       expected_ds = [{"field": results[i]} for i in range(10)]
-      print("gaurav", list(mapped_ds.as_numpy_iterator()))
       self.assertListEqual(list(mapped_ds.as_numpy_iterator()), expected_ds)