Add license header.

Author: zhangyue1818

NOTICE

@@ -1,5 +1,5 @@
 Apache MADlib
-Copyright 2016-2025 The Apache Software Foundation.
+Copyright 2016-2026 The Apache Software Foundation.
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

src/ports/postgres/modules/pmml/__init__.py_in

@@ -1,3 +1,29 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+
+
+# Python 3.10+ compatibility fix:
+# In Python 3.10, collections.MutableSequence, collections.MutableMapping,
+# and collections.MutableSet were removed from the collections module.
+# They must now be imported from collections.abc instead.
+# This patch restores backward compatibility by adding these aliases back
+# to the collections module if they are missing.
 import collections
 import collections.abc
 if not hasattr(collections, 'MutableSequence'):