add compat for string.

fluid/PaddleSlim/utility.py

@@ -21,6 +21,7 @@ import os
 import numpy as np
 import six
 import paddle.fluid as fluid
+import paddle.compat as cpt
 from paddle.fluid import core
 from paddle.fluid.framework import Program
 
@@ -79,7 +80,7 @@ def save_persistable_nodes(executor, dirname, graph):
     persistable_nodes = []
     all_persistable_nodes = graph.all_persistable_nodes()
     for node in all_persistable_nodes:
-        name = node.name()
+        name = cpt.to_text(node.name())
         if name not in persistable_node_names:
             persistable_node_names.add(name)
             persistable_nodes.append(node)
@@ -114,7 +115,7 @@ def load_persistable_nodes(executor, dirname, graph):
     persistable_nodes = []
     all_persistable_nodes = graph.all_persistable_nodes()
     for node in all_persistable_nodes:
-        name = node.name()
+        name = cpt.to_text(node.name())
         if name not in persistable_node_names:
             persistable_node_names.add(name)
             persistable_nodes.append(node)