def _last_index(self, s):
        self.set_index(max(0, self._find_one_after_last_labeled_index() - 1))
def testDropoutWrapperWithKerasLSTMCell(self):
    wrapper_cls = rnn_cell_wrapper_v2.DropoutWrapper
    cell = layers.LSTMCell(10)

    with self.assertRaisesRegex(ValueError, "does not work with "):
      wrapper_cls(cell)

    cell = layers.LSTMCellV2(10)
    with self.assertRaisesRegex(ValueError, "does not work with "):
      wrapper_cls(cell)