chore: import upstream snapshot with attribution

python/paddle/distributed/launch/controllers/__init__.py

@@ -0,0 +1,36 @@
+# Copyright (c) 2022 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.
+
+__all__ = []
+
+from .collective import CollectiveController, CollectiveElasticController
+from .ipu_controller import IPUController
+from .ps import PSController
+from .rpc import RpcController
+
+# the order is extremely important
+_controllers = [
+    IPUController,
+    CollectiveElasticController,
+    PSController,
+    RpcController,
+    CollectiveController,
+]
+
+
+def init(ctx):
+    for c in _controllers:
+        if c.enable(ctx):
+            ctx.print()
+            return c(ctx)