Question answeriung model, unanswerable question answer formatformat

Hello, I am working with question answering model right now and I am new to this kind of task.

If I have a question that can not be answered using the provided context, what is the format of answer?
For examples in squad dataset

question: To whom did the Virgin Mary allegedly appear in 1858 in Lourdes France?
answer: { "text": [ "Saint Bernadette Soubirous" ], "answer_start": [ 515 ] }

but what if this question can not be answer, how should I prepare answer: … ?
Should it be something like answer: { "text": [ ], "answer_start": [ -1 ] } ??

Do you have the answer to this problem?

Yes, I found this dataset.

There are some questions that have no answer. You can see the format.

1 Like

I see, thank you :heart_eyes: