Update mega.py

mega.py

@@ -37,8 +37,8 @@ class Mega(datasets.GeneratorBasedBuilder):
     def _info(self):
         return datasets.DatasetInfo()
     
-    def _generate_examples(self):
-        with open(self.config.data_dir, encoding="utf-8") as f:
+    def _generate_examples(self, filepath):
+        with open(filepath, encoding="utf-8") as f:
             reader = csv.DictReader(f,delimiter='\t' if '.tsv' in self.config.data_dir else ',')
             for id_, row in enumerate(reader):
                 if id_ == 0: