message: append param server
diff: @@ -64,9 +64,12 @@ class ParameterServer(Params):
  val_other = p_server.store[key]
  if isinstance(val_self, ParameterServer) and isinstance(val_other, ParameterServer):
  val_self.AppendParamServer(val_other, overwrite=overwrite)
  - elif not overwrite:
  + else:
  + if overwrite:
  + self.__setitem__(key, p_server[key])
  + else:
  logging.warning("Cannot append conflicting key '{}'!".format(key))
  - if not key in self.store or overwrite:
  + else:
  self.__setitem__(key, p_server[key])
  def FindKey(self, param_key):
  