fix program desc unit test error

Author: JiabinYang

paddle/fluid/framework/program_desc_test.cc

@@ -87,8 +87,17 @@ TEST(ProgramDesc, copy_ctor) {
     ASSERT_EQ(op_origin->Inputs(), op_copy->Inputs());
     ASSERT_EQ(op_origin->Outputs(), op_copy->Outputs());
 
-    ASSERT_EQ(op_copy->Proto()->SerializeAsString(),
-              op_origin->Proto()->SerializeAsString());
+    ASSERT_EQ(op_origin->Proto()->attrs().size(),
+              op_copy->Proto()->attrs().size());
+    for (auto it = op_origin->Proto()->attrs().begin();
+         it != op_origin->Proto()->attrs().end(); ++it) {
+      for (auto it_2 = op_copy->Proto()->attrs().begin();
+           it_2 != op_copy->Proto()->attrs().end(); ++it_2) {
+        if (it->name() == it_2->name()) {
+          ASSERT_TRUE(it_2->SerializeAsString() == it->SerializeAsString());
+        }
+      }
+    }
 
     if (op->Type() == "op_with_subblock") {
       ASSERT_EQ(1, op->GetBlockAttrId("sub_block"));