region:us
squad_v010_allanswers in T5 paper https://github.com/google-research/text-to-text-transfer-transformer/blob/main/t5/data/tasks.py



DatasetDict({
    squad: DatasetDict({
        train: Dataset({
            features: ['idx', 'inputs', 'targets'],
            num_rows: 87599
        })
        validation: Dataset({
            features: ['idx', 'inputs', 'targets'],
            num_rows: 10570
        })
    })
})