code: def question_answering():
      """Extractive Question Answering."""
      cli = FlashCLI(
          QuestionAnsweringTask,
          QuestionAnsweringData,
          default_datamodule_builder=from_squad,
          default_arguments={
              "trainer.max_epochs": 3,
              "model.backbone": "distilbert-base-uncased",
          },
      )
  
      cli.trainer.save_checkpoint("question_answering_model.pt")
  
imports: from flash.core.data.utils import download_data
  from flash.core.utilities.flash_cli import FlashCLI
  from flash.text import QuestionAnsweringData, QuestionAnsweringTask
label_desc: Use image node_id 2 for calling a global function with example usage: question_answering() without return types