code: def test_qa_single():
      out = qa(qa_example["q1"], qa_example["c"])
      assert type(out) == str, "Qa answer not a string"
      assert out == qa_example["a1"], "Wrong answer to simple qa"
  
imports: from backprop import Emotion, ImageClassification, QA, Summarisation, TextClassification, TextGeneration, TextVectorisation
  import numpy
  import torch
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: test_qa_single() without return types