Update custom_objects.py

custom_objects.py

@@ -9,5 +9,5 @@ def firetrust_activation(x):
 
 CUSTOM_OBJECTS = {
     "firetrust_activation": firetrust_activation,
-    "mse": tf.keras.losses.MeanSquaredError,
+    "mse": tf.keras.losses.MeanSquaredError
 }