Fixed answers key

dureader.py

@@ -140,11 +140,16 @@ class DuReader(datasets.GeneratorBasedBuilder):
             for p in d["paragraphs"]:
                 context = p["context"]
                 for qa in p["qas"]:
+                    starts = [x["answer_start"] for x in qa["answers"]]
+                    answers = [x["text"] for x in qa["answers"]]
                     example = {
                         "id": qa["id"],
                         "context": context,
                         "question": qa["question"],
-                        "answers": qa["answers"],
+                        "answers": {
+                            "text": answers,
+                            "answer_start": starts,
+                        },
                     }
                     yield example["id"], example
 
@@ -170,13 +175,18 @@ class DuReader(datasets.GeneratorBasedBuilder):
                 title = p["title"]
                 context = p["context"]
                 for qa in p["qas"]:
+                    starts = [x["answer_start"] for x in qa["answers"]]
+                    answers = [x["text"] for x in qa["answers"]]
                     example = {
                         "id": qa["id"],
                         "title": title,
                         "context": context,
                         "question": qa["question"],
                         "is_impossible": qa["is_impossible"],
-                        "answers": qa["answers"],
+                        "answers": {
+                            "text": answers,
+                            "answer_start": starts,
+                        },
                         "type": qa["type"],
                     }
                     yield example["id"], example