def _test_example_transform(test_examples):
    """
    Change test examples to a format like SQUAD data.
    Parameters
    ---------- 
    test_examples: a list of (question, context) tuple. 
        Example: [('Which NFL team represented the AFC at Super Bowl 50?',
                 'Super Bowl 50 was an American football game ......),
                  ('Where did Super Bowl 50 take place?',,
                 'Super Bowl 50 was ......),
                 ......]
    Returns
    ----------
    test_examples_tuples : a list of SQUAD tuples
    """
    test_examples_tuples = []
    i = 0
    for test in test_examples:
        question, context = test[0], test[1]  # test.split(" [CONTEXT] ")
        tup = (i, "", question, context, [], [])
        test_examples_tuples.append(tup)
        i += 1
    return(test_examples_tuples)