Raise DefunctDatasetError (#6)

- Raise DefunctDatasetError (6de39857b7ab8eb508cf606fa0a3733c81de24bc)

amazon_us_reviews.py

@@ -19,6 +19,7 @@
 import csv
 
 import datasets
+from datasets.exceptions import DefunctDatasetError
 
 
 _CITATION = """\
@@ -129,6 +130,9 @@ class AmazonUSReviews(datasets.GeneratorBasedBuilder):
     ]
 
     def _info(self):
+        raise DefunctDatasetError(
+            "Dataset 'amazon_us_reviews' is defunct and no longer accessible due to the decision of data providers"
+        )
         return datasets.DatasetInfo(
             description=_DESCRIPTION,
             features=datasets.Features(