Raise DefunctDatasetError

bookcorpusopen.py

@@ -21,6 +21,7 @@ import os
 from fnmatch import fnmatch
 
 import datasets
+from datasets.exceptions import DefunctDatasetError
 
 
 _DESCRIPTION = """\
@@ -75,6 +76,9 @@ class BookCorpusOpen(datasets.GeneratorBasedBuilder):
     ]
 
     def _info(self):
+        raise DefunctDatasetError(
+            "Dataset 'bookcorpusopen' is defunct and no longer accessible due to unavailability of the source data"
+        )
         return datasets.DatasetInfo(
             description=_DESCRIPTION,
             features=datasets.Features(