message: Set _num_inputs property on _CuDNNRNN
diff: @@ -77,6 +77,7 @@ class _CuDNNRNN(RNN):
  self.constants_spec = None
  self._states = None
  self._num_constants = None
  + self._num_inputs = None
  self._vector_shape = constant_op.constant([-1])
  def _canonical_to_params(self, weights, biases):
  