remove utf8 encoding

casum.py

@@ -75,7 +75,7 @@ class CaSum(datasets.GeneratorBasedBuilder):
     def _generate_examples(self, filepath):
         """This function returns the examples in the raw (text) form."""
         logger.info("generating examples from = %s", filepath)
-        with open(filepath, encoding="utf-8") as f:
+        with open(filepath) as f:
             for id_, row in enumerate(f):
                 article = json.loads(row)
                 text = article['text']