Fix to make the test more stable.

Change-Id: Id9edf30a211cdace462737e2f390d6d697ec458c

Author: wwwind

tensorflow_model_optimization/python/core/clustering/keras/cluster_wrapper_test.py

@@ -170,7 +170,7 @@ def testValuesAreClusteredAfterStripping(self,
     or equal to number_of_clusters.
     """
     original_model = tf.keras.Sequential([
-        layers.Dense(32, input_shape=(10,)),
+        layers.Dense(32, input_shape=(10,), name='abc'),
     ])
 
     weights_name = original_model.layers[0].weights[0].name