Update files from the datasets library (from 1.6.1)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.6.1

amazon_polarity.py

@@ -113,7 +113,7 @@ class AmazonPolarity(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filepath, split):
-        """ Yields examples. """
+        """Yields examples."""
 
         with open(filepath, encoding="utf-8") as f:
             data = csv.reader(f, delimiter=",", quoting=csv.QUOTE_ALL)