Remove support for deprecated ray.util.data.MLDataset (#218)

Ray MLDataset has been deprecated. We should no longer maintain support for it in newer xgboost-ray versions.

xgboost_ray/data_sources/__init__.py

@@ -3,7 +3,6 @@
 from xgboost_ray.data_sources.pandas import Pandas
 from xgboost_ray.data_sources.modin import Modin
 from xgboost_ray.data_sources.dask import Dask
-from xgboost_ray.data_sources.ml_dataset import MLDataset
 from xgboost_ray.data_sources.petastorm import Petastorm
 from xgboost_ray.data_sources.csv import CSV
 from xgboost_ray.data_sources.parquet import Parquet
@@ -12,12 +11,11 @@
 from xgboost_ray.data_sources.partitioned import Partitioned
 
 data_sources = [
-    Numpy, Pandas, Partitioned, Modin, Dask, MLDataset, Petastorm, CSV,
-    Parquet, ObjectStore, RayDataset
+    Numpy, Pandas, Partitioned, Modin, Dask, Petastorm, CSV, Parquet,
+    ObjectStore, RayDataset
 ]
 
 __all__ = [
     "DataSource", "RayFileType", "Numpy", "Pandas", "Modin", "Dask",
-    "MLDataset", "Petastorm", "CSV", "Parquet", "ObjectStore", "RayDataset",
-    "Partitioned"
+    "Petastorm", "CSV", "Parquet", "ObjectStore", "RayDataset", "Partitioned"
 ]

xgboost_ray/data_sources/data_source.py

@@ -24,7 +24,7 @@ class DataSource:
     """Abstract class for data sources.
 
     xgboost_ray supports reading from various sources, such as files
-    (e.g. CSV, Parquet) or distributed datasets (Ray MLDataset, Modin).
+    (e.g. CSV, Parquet) or distributed datasets (Modin).
 
     This abstract class defines an interface to read from these sources.
     New data sources can be added by implementing this interface.

xgboost_ray/matrix.py

@@ -20,14 +20,8 @@
 from ray import logger
 from ray.util.annotations import PublicAPI, DeveloperAPI
 
-from xgboost_ray.util import Unavailable
 from xgboost_ray.data_sources import DataSource, data_sources, RayFileType
 
-try:
-    from ray.util.data import MLDataset
-except ImportError:
-    MLDataset = Unavailable
-
 try:
     from ray.data.dataset import Dataset as RayDataset
 except (ImportError, ModuleNotFoundError):
@@ -46,7 +40,7 @@ class RayDataset:
 if TYPE_CHECKING:
     from xgboost_ray.xgb import xgboost as xgb
 
-Data = Union[str, List[str], np.ndarray, pd.DataFrame, pd.Series, MLDataset]
+Data = Union[str, List[str], np.ndarray, pd.DataFrame, pd.Series]
 
 
 def concat_dataframes(dfs: List[Optional[pd.DataFrame]]):
@@ -404,7 +398,7 @@ def get_data_source(self) -> Type[DataSource]:
 
         # Todo (krfricke): It would be good to have a more general way to
         # check for compatibility here. Combine with test below?
-        if not (isinstance(self.data, (Iterable, MLDataset, RayDataset))
+        if not (isinstance(self.data, (Iterable, RayDataset))
                 or hasattr(self.data, "__partitioned__")) or invalid_data:
             raise ValueError(
                 f"Distributed data loading only works with already "
@@ -444,7 +438,7 @@ def get_data_source(self) -> Type[DataSource]:
                 f"with FileType: {self.filetype} for a distributed dataset."
                 "\nFIX THIS by passing a supported data type. Supported "
                 "data types for distributed datasets are a list of "
-                "CSV or Parquet sources as well as Ray MLDatasets. If using "
+                "CSV or Parquet sources. If using "
                 "Modin, Dask, or Petastorm, make sure the library is "
                 "installed.")
 
@@ -586,7 +580,7 @@ class RayDMatrix:
 
     Args:
         data: Data object. Can be a pandas dataframe, pandas series,
-            numpy array, Ray MLDataset, modin dataframe, string pointing to
+            numpy array, modin dataframe, string pointing to
             a csv or parquet file, or list of strings pointing to csv or
             parquet files.
         label: Optional label object. Can be a pandas series, numpy array,
@@ -874,13 +868,10 @@ def get_data(
 
 def _can_load_distributed(source: Data) -> bool:
     """Returns True if it might be possible to use distributed data loading"""
-    from xgboost_ray.data_sources.ml_dataset import MLDataset
     from xgboost_ray.data_sources.modin import Modin
 
     if isinstance(source, (int, float, bool)):
         return False
-    elif MLDataset.is_data_type(source):
-        return True
     elif Modin.is_data_type(source):
         return True
     elif isinstance(source, str):
@@ -902,12 +893,9 @@ def _can_load_distributed(source: Data) -> bool:
 
 def _detect_distributed(source: Data) -> bool:
     """Returns True if we should try to use distributed data loading"""
-    from xgboost_ray.data_sources.ml_dataset import MLDataset
     from xgboost_ray.data_sources.modin import Modin
     if not _can_load_distributed(source):
         return False
-    if MLDataset.is_data_type(source):
-        return True
     if Modin.is_data_type(source):
         return True
     if isinstance(source, Iterable) and not isinstance(source, str) and \

xgboost_ray/tests/test_matrix.py

@@ -289,32 +289,6 @@ def testFromMultiParquetString(self):
             self._testMatrixCreation(
                 [data_file_1, data_file_2], "label", distributed=True)
 
-    def testFromMLDataset(self):
-        try:
-            from ray.util import data as ml_data
-        except ImportError:
-            self.skipTest("MLDataset not available in current Ray version.")
-            return
-
-        with tempfile.TemporaryDirectory() as dir:
-            data_file_1 = os.path.join(dir, "data_1.parquet")
-            data_file_2 = os.path.join(dir, "data_2.parquet")
-
-            data_df = pd.DataFrame(self.x, columns=["a", "b", "c", "d"])
-            data_df["label"] = pd.Series(self.y)
-
-            df_1 = data_df[0:len(data_df) // 2]
-            df_2 = data_df[len(data_df) // 2:]
-
-            df_1.to_parquet(data_file_1)
-            df_2.to_parquet(data_file_2)
-
-            dataset = ml_data.read_parquet(
-                [data_file_1, data_file_2], num_shards=2)
-
-            self._testMatrixCreation(dataset, "label", distributed=False)
-            self._testMatrixCreation(dataset, "label", distributed=True)
-
     def testDetectDistributed(self):
         with tempfile.TemporaryDirectory() as dir:
             parquet_file = os.path.join(dir, "file.parquet")
@@ -339,16 +313,6 @@ def testDetectDistributed(self):
             mat = RayDMatrix([csv_file] * 3, lazy=True)
             self.assertTrue(mat.distributed)
 
-            try:
-                from ray.util import data as ml_data
-                mat = RayDMatrix(
-                    ml_data.read_parquet(parquet_file, num_shards=1),
-                    lazy=True)
-                self.assertTrue(mat.distributed)
-            except ImportError:
-                print("MLDataset not available in current Ray version. "
-                      "Skipping part of test.")
-
     def testTooManyActorsDistributed(self):
         """Test error when too many actors are passed"""
         with self.assertRaises(RuntimeError):