style patterns

lib/errors/mape/Mape.cs

@@ -52,7 +52,10 @@ public sealed class Mape : BiInputIndicatorBase
         ValidateBatchInputs(actual, predicted, output, period);
 
         int len = actual.Length;
-        if (len == 0) return;
+        if (len == 0)
+        {
+            return;
+        }
 
         const int StackAllocThreshold = 256;
         Span<double> percentErrors = len <= StackAllocThreshold
@@ -62,4 +65,4 @@ public sealed class Mape : BiInputIndicatorBase
         ErrorHelpers.ComputePercentageErrors(actual, predicted, percentErrors, Epsilon);
         ErrorHelpers.ApplyRollingMean(percentErrors, output, period);
     }
-}
+}