fix unittest test=develop

paddle/fluid/framework/details/build_strategy.cc

@@ -153,6 +153,7 @@ std::unique_ptr<ir::Graph> BuildStrategy::Apply(
       pass->Erase("local_scopes");
       pass->SetNotOwned<const std::vector<Scope *>>("local_scopes",
                                                     &local_scopes);
+      pass->Erase("num_parallel_devices");
       pass->Set<size_t>("num_parallel_devices",
                         new size_t(num_parallel_devices));
 

python/paddle/fluid/tests/unittests/test_parallel_executor_crf.py

@@ -211,7 +211,9 @@ class TestCRFModel(unittest.TestCase):
                 use_cuda=True)
 
         self.check_network_convergence(
-            is_sparse=False, build_strategy=build_strategy, use_cuda=False)
+            is_sparse=False,
+            build_strategy=self._new_build_strategy(),
+            use_cuda=False)
 
     def test_update_sparse_parameter_reduce(self):
         if core.is_compiled_with_cuda():