code: def test_constant_eval():
      c = C.Constant(value=1)
      c_plus_1 = c + 1
      op = C.combine([c_plus_1, c])
      result = op.eval({})
      assert np.array_equal(result[c_plus_1.output], 2.0)
      assert np.array_equal(result[c], 1.0)
  
file_path: CNTK/bindings/python/cntk/ops/tests/evaluation_test.py
imports: from __future__ import division
  import numpy
  import pytest
  from .ops_test_utils import _test_binary_op, AA, precision, PRECISION_TO_TYPE, unittest_helper
  from cntk import dropout, combine
  import cntk
label_desc: Use image node_id 5 for calling a global function with example usage: test_constant_eval() without return types