def test_empty_output(self, shape=(2, 6)):
        """
        The case when the mask is zero and the output is an empty tensor.
        """
        self._test_masked_select(
            shape=shape,
            test_name="masked_select_zero_mask",
        )

        The case when the mask is zero and the output is an empty tensor.
        
tests/unittest/ops/test_masked_select.py