def save(self, filename=None):
        filename = Path(filename) if filename is not None else self.filename
        with filename.open("w") as f:
            f.write(self.yaml)
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)