style patterns

lib/errors/rmse/Rmse.Tests.cs

@@ -247,4 +247,4 @@ public class RmseTests
         // All errors are 5, MSE = 25, RMSE = 5
         Assert.Equal(5.0, results.Last.Value, 10);
     }
-}
+}

lib/errors/rmse/Rmse.cs

@@ -57,7 +57,10 @@ public sealed class Rmse : BiInputIndicatorBase
         ValidateBatchInputs(actual, predicted, output, period);
 
         int len = actual.Length;
-        if (len == 0) return;
+        if (len == 0)
+        {
+            return;
+        }
 
         const int StackAllocThreshold = 256;
         Span<double> sqErrors = len <= StackAllocThreshold