Update wikipedia-nq.py

wikipedia-nq.py

@@ -96,15 +96,16 @@ class WikipediaNq(datasets.GeneratorBasedBuilder):
         ]
         return splits
 
-    def _generate_examples(self, filepath):
+    def _generate_examples(self, files):
         """Yields examples."""
-        with open(filepath, encoding="utf-8") as f:
-            for line in f:
-                data = json.loads(line)
-                if data.get('negative_passages') is None:
-                    data['negative_passages'] = []
-                if data.get('positive_passages') is None:
-                    data['positive_passages'] = []
-                if data.get('answers') is None:
-                    data['answers'] = []
-                yield data['query_id'], data
+        for filepath in files:
+            with open(filepath, encoding="utf-8") as f:
+                for line in f:
+                    data = json.loads(line)
+                    if data.get('negative_passages') is None:
+                        data['negative_passages'] = []
+                    if data.get('positive_passages') is None:
+                        data['positive_passages'] = []
+                    if data.get('answers') is None:
+                        data['answers'] = []
+                    yield data['query_id'], data