code: def _info(self):
      return datasets.MetricInfo(
          description=_DESCRIPTION,
          citation=_CITATION,
          inputs_description=_KWARGS_DESCRIPTION,
          features=datasets.Features(
              {
                  "predictions": {
                      "id": datasets.Value("string"),
                      "prediction_text": datasets.Value("string"),
                      "no_answer_probability": datasets.Value(
                          "float32"
                      ),
                  },
                  "references": {
                      "id": datasets.Value("string"),
                      "answers": datasets.features.Sequence(
                          {
                              "text": datasets.Value("string"),
                              "answer_start": datasets.Value("int32"),
                          }
                      ),
                  },
              }
          ),
          codebase_urls=["https://rajpurkar.github.io/SQuAD-explorer/"],
          reference_urls=[
              "https://rajpurkar.github.io/SQuAD-explorer/"
          ],
      )
  
imports: import datasets
  from .evaluate import apply_no_ans_threshold, find_all_best_thresh, get_raw_scores, make_eval_dict, make_qid_to_has_ans, merge_eval
label_desc: Use image node_id 1 for calling the SquadV2 obj's underlying member method code with example usage: obj._info() and returns: datasets