fix loader

comma2k19.py

@@ -30,7 +30,7 @@ class Comma2k19(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),
@@ -38,10 +38,9 @@ class Comma2k19(datasets.GeneratorBasedBuilder):
         ) for i in range(len(downloaded_files))]
 
   def _generate_examples(self, local_extracted_archive, files):
-    files = glob.glob(local_extracted_archive, recursive=True)
+    files = [os.path.join(dp, f) for dp, dn, filenames in os.walk(local_extracted_archive) for f in filenames]
     for path in files:
-      file_name = os.path.basename(path)
-      yield file_name, {'path': path}
+      yield path, {'path': path}
 
   def _get_examples_iterable_for_split(self, split_generator):
     for path in split_generator.gen_kwargs['files']: