Method test_empty_cat

tests/structures/test_boxes.py:177–179

(self)

class TestBoxes(unittest.TestCase):
    def test_empty_cat(self):
        x = Boxes.cat([])
        self.assertTrue(x.tensor.shape, (0, 4))

    # require https://github.com/pytorch/pytorch/pull/39336
    @unittest.skipIf(TORCH_VERSION < (1, 6), "Insufficient pytorch version")