Update LossesApi.cs

src/TensorFlowNET.Keras/Losses/LossesApi.cs

@@ -1,4 +1,4 @@
-namespace Tensorflow.Keras.Losses
+namespace Tensorflow.Keras.Losses
 {
     public class LossesApi
     {
@@ -7,5 +7,8 @@
 
         public ILossFunc CategoricalCrossentropy(bool from_logits = false)
             => new CategoricalCrossentropy(from_logits: from_logits);
+        
+        public ILossFunc MeanSquaredError(string reduction = null)
+          => new MeanSquaredError(reduction: reduction);
     }
 }