Fix the compile issue for cuda device (test=develop)

python/paddle/fluid/tests/unittests/test_conv3d_op.py

@@ -112,56 +112,32 @@ class TestConv3dOp(OpTest):
         return core.is_compiled_with_cuda() and self.use_cudnn
 
     def test_check_output(self):
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
         self.check_output_with_place(place, atol=1e-5)
-        else:
-            self.check_output()
 
     def test_check_grad(self):
         if self.dtype == np.float16:
             return
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
         self.check_grad_with_place(
-                place,
-                set(['Input', 'Filter']),
-                'Output',
-                max_relative_error=0.03)
-        else:
-            self.check_grad(
-                set(['Input', 'Filter']), 'Output', max_relative_error=0.03)
+            place, {'Input', 'Filter'}, 'Output', max_relative_error=0.03)
 
     def test_check_grad_no_filter(self):
         if self.dtype == np.float16:
             return
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
         self.check_grad_with_place(
             place, ['Input'],
             'Output',
             max_relative_error=0.03,
             no_grad_set=set(['Filter']))
-        else:
-            self.check_grad(
-                ['Input'],
-                'Output',
-                max_relative_error=0.03,
-                no_grad_set=set(['Filter']))
 
     def test_check_grad_no_input(self):
         if self.dtype == np.float16:
             return
-        if self.testcudnn():
-            place = core.CUDAPlace(0)
+        place = core.CUDAPlace(0) if self.testcudnn() else core.CPUPlace()
         self.check_grad_with_place(
-                place, ['Filter'],
-                'Output',
-                max_relative_error=0.03,
-                no_grad_set=set(['Input']))
-        else:
-            self.check_grad(
-                ['Filter'],
+            place, ['Input'],
             'Output',
             max_relative_error=0.03,
             no_grad_set=set(['Input']))