code: def test_sequence_unpack_without_primary_output(device_id, precision):
      x = C.sequence.input_variable(5)
      _, mask = C.sequence.unpack(x, 0).outputs
      bvm = mask + 0
  
      x1 = [
          np.random.randn(7, 5).astype("f"),
          np.random.randn(3, 5).astype("f"),
      ]
  
      expected = np.array(
          [[1.0] * 7, [1.0] * 3 + [0.0] * 4], dtype=np.float32
      )
  
      actual = bvm.eval({x: x1})
      assert np.allclose(actual, expected)
  
imports: from __future__ import division
  import numpy
  import pytest
  import cntk
  from .ops_test_utils import cntk_device
  from cntk.tests.test_utils import _to_dense, _to_csr
  from .ops_test_utils import unittest_helper, _test_unary_op, _test_binary_op, AA, precision, PRECISION_TO_TYPE, cntk_device
  from cntk import Value
  from cntk.axis import Axis
  from cntk.internal import sanitize_dtype_cntk
  from ..None import constant
label_desc: Use image node_id 28 for calling a global function with example usage: test_sequence_unpack_without_primary_output(device_id, precision) without return types