Update test.py

test.py

@@ -597,7 +597,7 @@ class Food500(datasets.GeneratorBasedBuilder):
 
     def _generate_examples(self, images, metadata_set):
         """Generate images and labels for splits."""
-        metadata_set = {str.encode("utf-8") for str in metadata_set}
+        metadata_set = {path.encode("utf-8") for path in metadata_set}
         for file_path, file_obj in images:
             if file_path.startswith(_IMAGES_DIR):
                 if file_path[len(_IMAGES_DIR) : -len(".jpg")] in metadata_set: