code: def _invade_isolated_Ts(self):
          r
          net = self.project.network
          Ts = net['throat.conns'].copy()
          invaded_Ps = self['pore.invasion_sequence'] > -1
          uninvaded_Ts = self['throat.invasion_sequence'] == -1
          isolated_Ts = np.logical_and(invaded_Ps[Ts[:, 0]],
                                       invaded_Ps[Ts[:, 1]])
          isolated_Ts = np.logical_and(isolated_Ts, uninvaded_Ts)
          inv_Pc = self['pore.invasion_pressure']
          inv_seq = self['pore.invasion_sequence']
          if np.any(isolated_Ts):
              max_array = Ts[:, 0]
              second_higher = inv_seq[Ts][:, 1] > inv_seq[Ts][:, 0]
              max_array[second_higher] = Ts[:, 1][second_higher]
              mPc = inv_Pc[max_array]
              mSeq = inv_seq[max_array]
              mClu = self['pore.cluster'][max_array]
              self['throat.invasion_pressure'][isolated_Ts] = mPc[isolated_Ts]
              self['throat.invasion_sequence'][isolated_Ts] = mSeq[isolated_Ts]
              self['throat.cluster'][isolated_Ts] = mClu[isolated_Ts]
docs: r"""
          Throats that are uninvaded connected to pores that are both invaded
          should be invaded too.