add alias for ChainDataset, ConcatDataset, Dataset, IterableDataset (PaddlePaddle#77391)

Author: algorithm1832

python/paddle/utils/data.py

@@ -0,0 +1,20 @@
+# 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 paddle.io import (
+    ChainDataset as ChainDataset,
+    ConcatDataset as ConcatDataset,
+    Dataset as Dataset,
+    IterableDataset as IterableDataset,
+)