code: def _generate_examples(self, filepath):
      
      logging.info("generating examples from = %s", filepath)
      with tf.io.gfile.GFile(filepath) as f:
        squad = json.load(f)
        for article in squad["data"]:
          if "title" in article:
            title = article["title"].strip()
          else:
            title = ""
          for paragraph in article["paragraphs"]:
            context = paragraph["context"].strip()
            for qa in paragraph["qas"]:
              question = qa["question"].strip()
              id_ = qa["id"]
  
              answer_starts = [answer["answer_start"] for answer in qa["answers"]]
              answers = [answer["text"].strip() for answer in qa["answers"]]
  
              # Features currently used are "context", "question", and "answers".
              # Others are extracted here for the ease of future expansions.
              example = {
                  "title": title,
                  "context": context,
                  "question": question,
                  "id": id_,
                  "answer_starts": answer_starts,
                  "answers": answers,
              }
              yield {
                  "question": example["question"],
                  # TODO(b/121176753): return all the answers.
                  "first_answer": example["answers"][0],
                  "context": example["context"]
              }
docs: This function returns the examples in the raw (text) form.