Raise DefunctDatasetError

the_pile_openwebtext2.py

@@ -20,6 +20,7 @@ import json
 import zstandard
 
 import datasets
+from datasets.exceptions import DefunctDatasetError
 
 
 _CITATION = """\
@@ -53,6 +54,9 @@ class Openwebtext2(datasets.GeneratorBasedBuilder):
     ]
 
     def _info(self):
+        raise DefunctDatasetError(
+            "Dataset 'the_pile_openwebtext2' is defunct and no longer accessible due to unavailability of the source data"
+        )
         return datasets.DatasetInfo(
             description=_DESCRIPTION,
             features=datasets.Features(