fix: Fixed preview

imagenette.py

@@ -112,26 +112,25 @@ 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_iters = {l: dl_manager.iter_archive(v) for l, v in archive_path.items()}
         return [
             datasets.SplitGenerator(
                 name=datasets.Split.TRAIN,
                 gen_kwargs={
-                    "image_folder": os.path.join(local_extracted_archive, "train"),
-                    "split": "train",
+                    "archive_iter": archive_iters["train"],
                 },
             ),
             datasets.SplitGenerator(
                 name=datasets.Split.VALIDATION,
                 gen_kwargs={
-                    "image_folder": os.path.join(local_extracted_archive, "val"),
-                    "split": "validation",
+                    "archive_iter": archive_iters["val"],
                 },
             ),
         ]
 
-    def _generate_examples(self, image_folder, split):
+    def _generate_examples(self, archive_iter):
         idx = 0
-        for class_idx, class_folder in _LABEL_MAP:
-            for filepath in os.listdir(class_folder):
-                yield idx, {"image": os.path.join(image_folder, class_folder, filepath), "label": class_idx}
-                idx += 1
+        for path, f in archive_iter:
+            class_idx = _LABEL_MAP.index(path.split("/")[-2])
+            yield idx, {"image": path, "label": class_idx}
+            idx += 1