chore: import upstream snapshot with attribution

python/paddle/distributed/fleet/base/private_helper_function.py

@@ -0,0 +1,33 @@
+#   Copyright (c) 2020 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__ = []
+
+
+def wait_server_ready(endpoints):
+    """
+    Wait until parameter servers are ready, use connext_ex to detect
+    port readiness.
+
+    Args:
+    endpoints (list|tuple): endpoints string list, like:
+    ["127.0.0.1:8080", "127.0.0.1:8081"]
+
+    Examples:
+        .. code-block:: pycon
+
+             >>> wait_server_ready(["127.0.0.1:8080", "127.0.0.1:8081"])
+    """
+    return