What's the data format of the QA json file in official scripts

hi ,dear
my data format is down, that is the train-v2.0.json of the SQuAD2.0 datasets

{"id": "56be85543aeaaa14008c9063", "title": "Beyonc\u00e9", "context": "Beyonc\u00e9 Giselle Knowles-Carter (/bi\u02d0\u02c8j\u0252nse\u026a/ bee-YON-say) (born September 4, 1981) is an American singer, songwriter, record producer and actress. Born and raised in Houston, Texas, she performed in various singing and dancing competitions as a child, and rose to fame in the late 1990s as lead singer of R&B girl-group Destiny's Child. Managed by her father, Mathew Knowles, the group became one of the world's best-selling girl groups of all time. Their hiatus saw the release of Beyonc\u00e9's debut album, Dangerously in Love (2003), which established her as a solo artist worldwide, earned five Grammy Awards and featured the Billboard Hot 100 number-one singles \"Crazy in Love\" and \"Baby Boy\".", "question": "When did Beyonce start becoming popular?", "answers": {"text": ["in the late 1990s"], "answer_start": [269]}}
{"id": "56be85543aeaaa14008c9065", "title": "Beyonc\u00e9", "context": "Beyonc\u00e9 Giselle Knowles-Carter (/bi\u02d0\u02c8j\u0252nse\u026a/ bee-YON-say) (born September 4, 1981) is an American singer, songwriter, record producer and actress. Born and raised in Houston, Texas, she performed in various singing and dancing competitions as a child, and rose to fame in the late 1990s as lead singer of R&B girl-group Destiny's Child. Managed by her father, Mathew Knowles, the group became one of the world's best-selling girl groups of all time. Their hiatus saw the release of Beyonc\u00e9's debut album, Dangerously in Love (2003), which established her as a solo artist worldwide, earned five Grammy Awards and featured the Billboard Hot 100 number-one singles \"Crazy in Love\" and \"Baby Boy\".", "question": "What areas did Beyonce compete in when she was growing up?", "answers": {"text": ["singing and dancing"], "answer_start": [207]}}

so any one could help me ?
thx

The structure for the SQuAD2.0 can be found in QA format, which can be adapted to your needs. To implement this format, you can refer to the run_squad.py script located in the examples folder of the transformers repository.
The second option is directly from huggingface datasets: squad_v2_hf

thanks for your kind reply,
I set the format as QA format as you said ,but got confused,
the answers must include “answer_start”, that is , the answers must in the context, could this call UnderStanding ?

The SQuAD dataset is designed to help with the task of extracting answers, where the answers are short snippets of text that may appear multiple times within a given context. To ensure the accuracy of the answer extraction, the answer_start index is necessary to pinpoint the exact location of the correct answer within the context.
If your model is able to accurately identify the appropriate answer_start position, it could indicate that the model has some level of comprehension of the question being asked within the context.

the datasets must have “id” in the json?
could answer_start be [ ].

Unfortunately, No. I have checked the run_squad.py implementation and it requires answer_start .