Created by: pkuyym

As we all know，functions or variables named like __init__、__del__ etc. are built-in entities in python. Generally speaking, it's not a good idea to name our own functions or variables at the same way. But I find some python codes disobey such rules, is that allowed in paddle's naming rules?

For example, code snippet in python/paddle/v2/optimizer.py:

def __create_local_updater__(self):
        return swig_api.ParameterUpdater.createLocalUpdater(self.__opt_conf__)

def __create_remote_updater__(self, pass_num, use_sparse_updater):
        return swig_api.ParameterUpdater.createRemoteUpdater(
                    self.__opt_conf__, pass_num, use_sparse_updater)