<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def run_band_structure(self, paths, with_eigenvectors=False, with_group_velocities=False, is_band_connection=False, path_connections=None, labels=None, is_legacy_plot=False):
 """Run phonon band structure calculation. Parameters paths : List of array_like Sets of qpoints that can be passed to phonopy.set_band_structure(). Numbers of qpoints can be different. shape of each array_like : (qpoints, 3) with_eigenvectors : bool, optional Flag whether eigenvectors are calculated or not. Default is False. with_group_velocities : bool, optional Flag whether group velocities are calculated or not. Default is False. is_band_connection : bool, optional Flag whether each band is connected or not. This is achieved by comparing similarity of eigenvectors of neghboring poins. Sometimes this fails. Default is False. path_connections : List of bool, optional This is only used in graphical plot of band structure and gives whether each path is connected to the next path or not, i.e., if False, there is a jump of q-points. Number of elements is the same at that of paths. Default is None. labels : List of str, optional This is only used in graphical plot of band structure and gives labels of end points of each path. The number of labels is equal to (2 - np.array(path_connections)).sum(). is_legacy_plot: bool, optional This makes the old style band structure plot. Default is False. """


        if self._dynamical_matrix is None:
            msg = ("Dynamical matrix has not yet built.")
            raise RuntimeError(msg)

        if with_group_velocities:
            if self._group_velocity is None:
                self._set_group_velocity()
            group_velocity = self._group_velocity
        else:
            group_velocity = None

        self._band_structure = BandStructure(
            paths,
            self._dynamical_matrix,
            with_eigenvectors=with_eigenvectors,
            is_band_connection=is_band_connection,
            group_velocity=group_velocity,
            path_connections=path_connections,
            labels=labels,
            is_legacy_plot=is_legacy_plot,
            factor=self._factor)