code: def test_from_matrix_vector():
      mat, vec, xform = build_xform()
      newxform = from_matrix_vector(mat, vec)
      np.testing.assert_array_equal(newxform, xform)
  
imports: import numpy
  from ..affine_utils import from_matrix_vector, to_matrix_vector
label_desc: Use image node_id 3 for calling a global function with example usage: test_from_matrix_vector() without return types