message: The unidirectional sequence rnn weights and bias should be required, not optional.
diff: @@ -2756,13 +2756,13 @@ def TFL_UnidirectionalSequenceRNNOp :
  ins TensorOf<[F32, I8]>:$input,
  // Weights
  - TFL_TensorOfOrNone<[F32, I8]>:$input_to_input_weights,
  + TensorOf<[F32, I8]>:$input_to_input_weights,
  // Recurrent weights
  - TFL_TensorOfOrNone<[F32, I8]>:$recurrent_to_input_weights,
  + TensorOf<[F32, I8]>:$recurrent_to_input_weights,
  // Bias
  - TFL_TensorOfOrNone<[F32]>:$input_gate_bias,
  + TensorOf<[F32]>:$input_gate_bias,
  // Hidden state.
  TFL_StatefulTensor:$hidden_state,
  