const string& op_name) {
  std::vector<int64_t> input_ids(inputs.size());
  std::vector<tensorflow::DataType> input_dtypes(inputs.size());
  for (int i = 0; i < inputs.size(); i++) {
    input_ids[i] = ToId(inputs[i]);
    input_dtypes[i] = inputs[i]->DataType();
  }
  std::vector<TapeTensor> tape_tensors;
  tape_tensors.reserve(outputs.size());
  for (auto t : outputs) {

        for model in flat_serialization_models
    ]
    flat_model_fields = flat_validation_model_fields + flat_serialization_model_fields
    input_types = {f.field_info.annotation for f in fields}
    unique_flat_model_fields = {
        f for f in flat_model_fields if f.field_info.annotation not in input_types
    }
    inputs = [
        (
            field,
            (
                field.mode