Update files from the datasets library (from 1.6.1)

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

pec.py

@@ -35,7 +35,7 @@ _URL = "https://dl.dropboxusercontent.com/s/u04fzuhsnxd0uvw/hf_pec.zip"
 
 
 class PECConfig(datasets.BuilderConfig):
-    """ BuilderConfig for PEC"""
+    """BuilderConfig for PEC"""
 
     def __init__(self, domain="all", **kwargs):
         """
@@ -142,7 +142,7 @@ class PEC(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filepath, split, persona):
-        """ Yields examples. """
+        """Yields examples."""
         # TODO: Yields (key, example) tuples from the dataset
         context_speakers = []
         context = []