Update aftdb.py

aftdb.py

@@ -141,6 +141,12 @@ class AFT_Dataset(datasets.GeneratorBasedBuilder):
             )
         if dl_manager.is_streaming:
             downloaded_files = dl_manager.download(all_path)
+            downloaded_files['train'] = [
+                dl_manager.iter_archive(ii) for ii in downloaded_files['train']
+            ]
+            downloaded_files['test'] = [
+                dl_manager.iter_archive(ii) for ii in downloaded_files['test']
+            ]
         else:
             downloaded_files = dl_manager.download_and_extract(all_path)
         return [
@@ -163,9 +169,7 @@ class AFT_Dataset(datasets.GeneratorBasedBuilder):
     def _generate_examples(self, filepaths, is_streaming):
         if is_streaming:
             _json, _jpg = False, False
-            dl_manager = datasets.DownloadManager()
-            for path_tar in filepaths:
-                iter_tar = dl_manager.iter_archive(path_tar)
+            for iter_tar in filepaths:
                 for path, file_obj in iter_tar:
                     if path.endswith('.json'):
                         metadata = json.load(file_obj)