def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
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)