Update wikipedia-for-mask-filling.py

wikipedia-for-mask-filling.py

@@ -114,6 +114,8 @@ class WikipediaForMaskFilling(datasets.GeneratorBasedBuilder):
 
     def _generate_examples(self, filepath):
         _id = 0
+        print("using filepaths:")
+        print(filepath)
         with open(filepath, encoding="utf-8") as f:
             try:
                 with xz.open(filepath) as f: