Update files from the datasets library (from 1.6.1)

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

pib.py

@@ -145,7 +145,7 @@ class Pib(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filepath, labelpath):
-        """ Yields examples. """
+        """Yields examples."""
         with open(filepath, encoding="utf-8") as f1, open(labelpath, encoding="utf-8") as f2:
             src = f1.read().split("\n")[:-1]
             tgt = f2.read().split("\n")[:-1]