Update ref-metrics.py

ref-metrics.py

@@ -106,10 +106,8 @@ class UserFriendlyMetrics(evaluate.Metric):
             return self.dummy_values(area_ranges_tuples)
     
     def dummy_values(self, area_ranges_tuples=None):
-        # Dummy randome values in the expected format that all new metrics need to return
-        # Default area ranges if not provided
+        """Dummy randome values in the expected format that all new metrics need to return"""
 
-        
         # Use default ranges if none are provided
         if area_ranges_tuples is None:
             area_ranges_tuples = [