Make layer serializable

mlpp_lib/probabilistic_layers.py

@@ -832,7 +832,7 @@ def output(self):
         """This allows the use of this layer with the shap package."""
         return super(IndependentTruncatedNormal, self).output[0]
 
-
+@tf.keras.saving.register_keras_serializable()
 class IndependentSoftClipCensored(tfpl.DistributionLambda):
     """An independent censored normal Keras layer."""