[API Compatibility] Add function alias for Dataset, IterableDataset and ConcatDataset

python/paddle/io/dataloader/dataset.py

@@ -693,6 +693,8 @@ def cumsum(sequence: Sequence[Any]) -> list[int]:
         return r
 
     def __init__(self, datasets: Iterable[Dataset[Any]]) -> None:
+        from paddle.utils.data import IterableDataset as UtilsIterableDataset
+
         self.datasets = list(datasets)
         assert len(self.datasets) > 0, (
             'datasets should not be an empty iterable'
@@ -701,6 +703,9 @@ def __init__(self, datasets: Iterable[Dataset[Any]]) -> None:
             assert not isinstance(d, IterableDataset), (
                 "ConcatDataset does not support IterableDataset"
             )
+            assert not isinstance(d, UtilsIterableDataset), (
+                "ConcatDataset does not support IterableDataset"
+            )
         self.cumulative_sizes = self.cumsum(self.datasets)
 
     def __len__(self) -> int:

python/paddle/utils/__init__.py

@@ -15,6 +15,7 @@
 from ..base.framework import require_version
 from . import (  # noqa: F401
     cpp_extension,
+    data,
     decorator_utils,
     dlpack,
     download,

python/paddle/utils/data/__init__.py

@@ -0,0 +1,17 @@
+# Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from .dataset import ConcatDataset, Dataset, IterableDataset
+
+__all__ = ['ConcatDataset', 'Dataset', 'IterableDataset']