fix typo

code_eval.py

@@ -199,7 +199,7 @@ class CodeEval(evaluate.Metric):
 
         for result in results.values():
             new_result = []
-            for completion_id, group in itertools.groupby(results, key=lambda x: x[0]):
+            for completion_id, group in itertools.groupby(result, key=lambda x: x[0]):
                 group = list(group)
                 new_result.append(
                     dict(