code: def test_eval_scalar():
      c = C.constant(value=2)
      assert (c + 3).eval() == 5.0
      assert np.all((c + [3, 4]).eval() == [5, 6])
  
imports: import numpy
  import cntk
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_eval_scalar() without return types