fix streaming ds

commavq.py

@@ -27,7 +27,7 @@ class CommaVQ(datasets.GeneratorBasedBuilder):
     """Returns SplitGenerators."""
     dl_manager.download_config.ignore_url_params = True
     downloaded_files = dl_manager.download(_URLS)
-    local_extracted_archive = dl_manager.extract(downloaded_files) if not dl_manager.is_streaming else None
+    local_extracted_archive = dl_manager.extract(downloaded_files) if not dl_manager.is_streaming else [None]*len(downloaded_files)
     return [
       datasets.SplitGenerator(
         name=str(i),