Revert "disable conv3d test (#7969)"

This reverts commit cbaa81d.

python/oneflow/test/modules/test_conv3d.py

@@ -22,14 +22,13 @@
 
 @flow.unittest.skip_unless_1n1d()
 class TestConv3DModule(flow.unittest.TestCase):
-    # Disable this test for unknown error
-    # @autotest(n=3)
-    # def test_nn_functional_conv3d(test_case):
-    #     device = random_device()
-    #     img = torch.ones((1, 3, 224, 224, 224), requires_grad=True).to(device)
-    #     kernel = torch.ones((6, 3, 3, 3, 3), requires_grad=True).to(device)
-    #     y = torch.nn.functional.conv3d(img, kernel)
-    #     return y
+    @autotest(n=3)
+    def test_nn_functional_conv3d(test_case):
+        device = random_device()
+        img = torch.ones((1, 3, 224, 224, 224), requires_grad=True).to(device)
+        kernel = torch.ones((6, 3, 3, 3, 3), requires_grad=True).to(device)
+        y = torch.nn.functional.conv3d(img, kernel)
+        return y
 
     @autotest(n=10)
     def test_conv3d_with_random_data(test_case):