add margin score

mfaq_light.py

@@ -67,7 +67,8 @@ class MFAQLight(datasets.GeneratorBasedBuilder):
             "domain_index": datasets.Value("int32"),
             "id": datasets.Value("string"),
             "negative": datasets.Value("string"),
-            "candidates": [datasets.Value("string")]
+            "candidates": [datasets.Value("string")],
+            "margin_score": datasets.Value("float32")
         }
         return datasets.DatasetInfo(
             description=_DESCRIPTION,
@@ -109,5 +110,6 @@ class MFAQLight(datasets.GeneratorBasedBuilder):
                         "domain_index": question["domain_index"],
                         "id": question["id"],
                         "negative": question.get("negative", ""),
-                        "candidates": question.get("candidates", [])
+                        "candidates": question.get("candidates", []),
+                        "margin_score": question.get("margin_score", 0)
                     }