} else if (str == "float32") {
      return builder.getF32Type();
    } else {
      return {};
    }
  };
  if (io_node_types_.size() < 2) return failure();
  if (!input_type) input_type = convert_str_to_type(io_node_types_[0]);
  if (!output_type) output_type = convert_str_to_type(io_node_types_[1]);
  return success();
}

LogicalResult ModifyIONodesPass::ModifyInputNodes(