fix: Fixed preview

imagenette.py

@@ -110,32 +110,25 @@ class OpenFire(datasets.GeneratorBasedBuilder):
         )
 
     def _split_generators(self, dl_manager):
-        archive_path = dl_manager.download(self.config.data_url)
-        local_extracted_archive = dl_manager.extract(archive_path) if not dl_manager.is_streaming else None
-        archive_iter = dl_manager.iter_archive(archive_path)
+        local_extracted_archive = dl_manager.download_and_extract(self.config.data_url)
         return [
             datasets.SplitGenerator(
                 name=datasets.Split.TRAIN,
                 gen_kwargs={
-                    "archive_iter": archive_iter,
-                    "split_folder": "train",
+                    "split_folder": os.path.join(local_extracted_archive, "train"),
                 },
             ),
             datasets.SplitGenerator(
                 name=datasets.Split.VALIDATION,
                 gen_kwargs={
-                    "archive_iter": archive_iter,
-                    "split_folder": "val",
+                    "split_folder": os.path.join(local_extracted_archive, "val"),
                 },
             ),
         ]
 
-    def _generate_examples(self, archive_iter, split_folder):
+    def _generate_examples(self, split_folder):
         idx = 0
-        for path, f in archive_iter:
-            path_split = path.split("/")
-            if path_split[-3] != split_folder:
-                continue
-            class_idx = _LABEL_MAP.index(path_split[-2])
-            yield idx, {"image": path, "label": class_idx}
-            idx += 1
+        for class_idx, class_folder in enumerate(_LABEL_MAP):
+            for path in os.listdir(os.path.join(split_folder, class_folder)):
+                yield idx, {"image": os.path.join(split_folder, class_folder, path), "label": class_idx}
+                idx += 1