remove non-public apis from distributed module (#48708)

python/paddle/distributed/communicator.py

@@ -34,7 +34,7 @@ import paddle
 from paddle.distributed.ps.utils.public import DistributedMode
 from paddle.framework import core
 
-__all__ = ['Communicator', 'FLCommunicator', 'LargeScaleKV']
+__all__ = []
 
 
 class Communicator:

python/paddle/distributed/ps/utils/collective_transpiler.py

@@ -21,7 +21,7 @@ from paddle.fluid import unique_name
 from paddle.framework import core
 from paddle.static import default_main_program, default_startup_program
 
-__all__ = ['GradAllReduce', 'LocalSGD', 'MultiThread']
+__all__ = []
 
 OpRole = core.op_proto_and_checker_maker.OpRole