Rename the columns using the 'names' dict.  This changes the names of
        the columns given as the keys and replaces them with the names given as
        the values.

        If inplace == False (default) this operation does not modify the
        current SFrame, returning a new SFrame.

        If inplace == True, this operation modifies the current
        SFrame, returning self.

        Parameters
        ----------
        names : dict[string, string]
            Dictionary of [old_name, new_name]

        inplace : bool, optional. Defaults to False.
            Whether the SFrame is modified in place.

def rename(self, names, inplace=False):
        """
        Rename the columns using the 'names' dict.  This changes the names of
        the columns given as the keys and replaces them with the names given as
        the values.

        If inplace == False (default) this operation does not modify the
        current SFrame, returning a new SFrame.

        If inplace == True, this operation modifies the current
        SFrame, returning self.

        Parameters
        ----------
        names : dict[string, string]
            Dictionary of [old_name, new_name]

        inplace : bool, optional. Defaults to False.
            Whether the SFrame is modified in place.
        """
        if (type(names) is not dict):
            raise TypeError('names must be a dictionary: oldname -> newname')

        if inplace:
            self.__is_dirty__ = True
            with cython_context():
                if self._is_vertex_frame():
                    graph_proxy = self.__graph__.__proxy__.rename_vertex_fields(names.keys(), names.values())
                    self.__graph__.__proxy__ = graph_proxy
                elif self._is_edge_frame():
                    graph_proxy = self.__graph__.__proxy__.rename_edge_fields(names.keys(), names.values())
                    self.__graph__.__proxy__ = graph_proxy
            return self
        else:
            return super(GFrame, self).rename(names, inplace=inplace)