Update test for detection model to test input list unmodified (#1085)

* Update test for detection model to test input list unmodified

Update test for detection model to test input list unmodified according to suggestion in a previous PR

* test input unchaged

test/test_models.py

@@ -45,7 +45,9 @@ class Tester(unittest.TestCase):
         model.eval()
         input_shape = (3, 300, 300)
         x = torch.rand(input_shape)
-        out = model([x])
+        model_input = [x]
+        out = model(model_input)
+        self.assertIs(model_input[0], x)
         self.assertEqual(len(out), 1)
         self.assertTrue("boxes" in out[0])
         self.assertTrue("scores" in out[0])