tiny stylistic fix

Author: TamasArm

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

@@ -107,9 +107,9 @@ def __init__(self,
 
     # Stores the pairs of weight names and their respective sparsity masks
     self.sparsity_masks = {}
-    self.zero_idx = {}
 
     # Stores the pairs of weight names and the zero centroids
+    self.zero_idx = {}
 
     # Map weight names to original clusterable weights variables
     # Those weights will still be updated during backpropagation