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 testWrapperV2Build(self, wrapper):
    cell = rnn_cell_impl.LSTMCell(10)
    wrapper = wrapper(cell)
    wrapper.build((1,))
    self.assertTrue(cell.built)